CN109851259B - special cement for masonry mortar and preparation method thereof - Google Patents
special cement for masonry mortar and preparation method thereof Download PDFInfo
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- CN109851259B CN109851259B CN201910234397.3A CN201910234397A CN109851259B CN 109851259 B CN109851259 B CN 109851259B CN 201910234397 A CN201910234397 A CN 201910234397A CN 109851259 B CN109851259 B CN 109851259B
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Abstract
The invention discloses special cement for masonry mortar, which comprises raw materials of clinker, gypsum, limestone, grinding aid and modified components, and also comprises or more active or inactive mixed materials including granulated blast furnace slag, granulated blast furnace slag powder, a pozzolanic mixed material and fly ash, and other waste residues are allowed to replace the active mixed material.
Description
Technical Field
The invention relates to the fields of cement and cement-based mortar production technologies and comprehensive utilization of industrial solid wastes, in particular to kinds of special cement for masonry mortar and a preparation method thereof.
Background
The cement-based mortar is a multi-component material, the admixture component in the cementing material for preparing the cement-based mortar at home is formed by two parts or is doped, namely parts are doped during the preparation of cement, a large amount of mineral powder, fly ash, limestone powder and filler micropowder admixtures are doped during the production of premixed mortar or field mixing mortar, in addition, aspects, the market application and the engineering quality provide requirements for refinement, diversification and differentiation on the cement-based mortar, the refinement requires that the quality of the mortar is stable and uniform, namely the quality and the proportion of each component are accurately implemented according to the design requirements, and the diversification and differentiation require that the cement-based mortar meets the requirements of different application occasions such as mortar joint building, plastering, ceramic tile pasting and the like and different performance, such as different water retention performance, tensile cohesive force, mortar fluidity, mortar, setting time and opening time.
At present, when products according to the requirements of GB175 general Portland cement and GB/T3183 masonry cement are used for producing ready-mixed mortar or on-site mixed mortar, admixture (containing filler micropowder) needs to be doped again due to the reasons of overhigh strength, high cost and the like of the cement, so that the construction is inconvenient and the work efficiency is reduced, or a plurality of additives and other modified components are doped when the mortar is prepared or the mortar is mixed on site due to high temperature and certain performance requirements or limited conditions before the cement leaves a factory, the proportion is difficult to control accurately according to a design formula, the quality and the stability cannot be effectively ensured, and moreover, if the types/components of the materials of the traditional cement mortar are too many on the construction site, the stacking site is limited, so that the site is disordered, the materials are leaked and seriously wasted, and the environmental protection is not facilitated.
The main performance of the mortar depends on the quality stability, reasonable formula and homogenization degree of components of the multi-component material, the improvement of the performance quality depends on the homogenization of a microstructure, the improvement of the microstructure depends on the homogenization of component distribution, the improvement of the component distribution depends on the mixing and homogenization of raw materials, which is the key point of the green manufacturing technology of the mortar is homogenization, and as the process equipment, the homogenization equipment, the production control, the management system and other conditions of a cement plant are more perfect relative to the mortar preparation field, and a mixed grinding or separate grinding mode can be adopted, the more uniform distribution ratio of the components, the more reasonable fineness and particle size distribution can be ensured, the more guaranteed quality and stability can be ensured, meanwhile, the proportioning of various mixed materials, clinkers, modified components and gypsum can be flexibly adjusted in time according to the engineering quality and requirements according to the quality and mineral composition of the clinkers, the properties of the mixed materials, harmful components, the fineness and particle size distribution of the components, so that the compound preparation of the gelled materials and the modified.
As the temperature of the milled cement reaches 100-120 ℃ in the traditional cement production method, the cement is in a closed storage and conveying facility device, the heat of the cement cannot be dissipated timely, and if the cement is doped with an additive (namely a modifying component) at a higher temperature, the molecular structure is changed, and the functions of certain additives and the compatibility with the cement are seriously influenced.
In order to improve the engineering quality and adapt to the construction differentiation requirements, aiming at various masonry, plastering, tile pasting, interior decoration mortar and field stirring mortar used in large quantities in cities, towns and rural areas, special cement which can be directly added with water and sand to prepare the mortar is urgently needed to be researched and developed so as to meet the engineering construction and market requirements, and the construction is convenient and the work efficiency is improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a preparation method of special cement for masonry mortar, which has raw material sources and simple preparation process.
In order to realize the purpose, the invention adopts the technical scheme that:
special cement for masonry mortar, which comprises the following raw materials, by mass, 0.15-0.40 part of clinker, 0.04-0.08 part of gypsum, 0.10-0.35 part of limestone, 0.0002-0.005 part of grinding aid, 0.001-0.0565 part of modification component, and or more active or inactive mixed materials including 0.12-0.70 part of granulated blast furnace slag, granulated blast furnace slag powder, fly ash and pozzolan mixed material, wherein 0-0.08 part of other waste residues is allowed to replace the active mixed material.
Preferably, the other waste residues comprise: the granulated blast furnace titanium slag, the granulated electric furnace phosphorus slag, the steel slag, the kiln dust, the silicon-manganese slag and the lithium slag, and the waste concrete, the scraps, the tailings and the waste stone solid waste with the use conditions meeting the national relevant safety, environmental protection and sanitation requirements; the content of tricalcium silicate in the clinker is more than 48.0 percent, and the total amount of silicate minerals is more than or equal to 66.0 percent; the content of aluminum trioxide in the limestone is less than or equal to 2.5 percent, and the content of calcium carbonate is more than 75.0 percent; the content of aluminum trioxide in the limestone is less than or equal to 2.5 percent, and the content of calcium carbonate is more than 75.0 percent.
Preferably, the grinding aid is prepared by compounding 1, 4-dihydroxyethyl piperazine with or more of thiocyanate, triethanolamine, glycerol, diethylene glycol, triethylene glycol, ethylene glycol, molasses and lignosulfonate.
Preferably, the modifying component comprises 0.001-0.01 part of an early strength agent, 0-0.005 part of cellulose ether, 0-0.04 part of redispersible latex powder and 0-0.0015 part of an air entraining agent.
Preferably, the early strength agent is prepared by compounding or more of 1, 4-dihydroxyisopropyl piperazine, sodium sulfate, sodium thiosulfate, calcium formate, calcium acetate, nitrate, thiocyanate and triethanolamine, wherein the cellulose ether is or more of hydroxypropyl methyl cellulose, methyl cellulose ether, hydroxyethyl cellulose ether and hydroxyethyl methyl cellulose ether, the redispersible latex powder is ethylene-vinyl acetate copolymer latex powder, vinyl acetate-higher fatty acid vinyl ester copolymer latex powder, acrylates, a styrene-butadiene copolymer and or more of wacker rubber powder, and the air entraining agent is or more of sodium dodecyl benzene sulfonate, sodium oleate, triisopropanolamine, saponins, rosins, modified rosin thermopolymers and the like.
method for preparing special cement for masonry mortar, which comprises the following steps:
step , raw material preparation, namely selecting the clinker, the gypsum, the limestone, the granulated blast furnace slag powder, the fly ash, the pozzolanic mixed material, other waste slag or the non-active mixed material, respectively storing the materials into a clinker warehouse, a gypsum warehouse and a mixed material warehouse by adopting a pre-homogenization measure of tiling, vertical cutting and matching use, and respectively storing the grinding aid and the modified component for later use by using a storage tank;
step two, grinding raw materials: two approaches can be used: a mixed grinding mode A or a separate grinding mode B;
a mixed grinding mode A is adopted, and the concrete operation steps are that the raw material components and the grinding aid in the step are added into grinding equipment according to the proportion for grinding together, cement micro powder with required fineness is obtained through powder selection equipment, and is treated by a cement cooling method, so that masonry cement micro powder without a modified component and not exceeding 60 ℃ is directly obtained, wherein the control parameters of the fineness of the cement micro powder are 8.0-20.0% of the residue of a 45-micron sieve and 0.5-3.0% of the residue of an 80-micron sieve;
and a respective grinding mode B is adopted, and the specific operation steps are as follows: pre-mixing and grinding clinker, gypsum and grinding aid; pre-mixing and grinding the granulated blast furnace slag, the granulated blast furnace slag powder, other waste residues and a grinding aid; separately grinding limestone, a pozzolanic material, fly ash, an inactive mixed material or other waste residues or pre-mixing grinding raw materials with similar grindability and a grinding aid; respectively obtaining clinker micropowder, mixed material micropowder or composite mixed material micropowder with required fineness by powder selecting equipment; the control parameters of the fineness of the clinker micropowder are as follows: 5-15% of residue on a 45 mu m sieve, 0.5-2.0% of residue on an 80 mu m sieve, and 320-380 m of specific surface area2Per kg; the control parameters of the fineness of the mixed material micro powder or the composite mixed material micro powder are as follows: 0-10% of residue on a 45 mu m sieve, 0-1.5% of residue on an 80 mu m sieve, and 380-480 m of specific surface area2/kg；
Step three, modification and compounding:
if a separate grinding mode B is adopted, inputting the clinker micropowder, the mixed material micropowder or the composite mixed material micropowder obtained in the step two into a secondary batching warehouse, metering the clinker micropowder, the mixed material micropowder or the composite mixed material micropowder with the modified component according to the proportion, adding the mixture into a mixer for mixing, detecting and controlling the uniformity of the product, and putting the product doped with the modified component into a finished product warehouse;
and if a mixed grinding mode A is adopted, inputting the cement micro powder obtained in the step two into a secondary batching storehouse, metering the cement micro powder and the modified components according to the proportion, adding the mixture into a mixer for mixing, detecting and controlling the uniformity of the product, and putting the obtained cement product special for the masonry mortar into a finished product storehouse.
Preferably, the cement cooling method adopts a combined cement cooling device, a large refrigeration air machine provides low-temperature compressed air with the temperature of 5-15 ℃ as a cooling medium, an air chute for conveying cement and a centrifugal fan are modified, the cement in the air chute is directly cooled by cold air, or a spiral conveying reamer is modified and installed on a water tank for external circulating water cooling, so that the temperature of the cement is reduced to below 60 ℃.
Preferably, the secondary batching in the third step is that a secondary batching process facility is added on the basis of the traditional cement production process, and the cooled cement micro powder and the mixed material micro powder after being milled and the modified components are blended, stirred and homogenized.
Preferably, the method for detecting and controlling the uniformity of the product in the third step comprises the steps of collecting a cement sample stirred by a mixer by using a continuous automatic sampler, measuring the CaO times every 1 hour, feeding detection information back to a batching control system, automatically adjusting the proportion of the clinker powder and the mixed powder or increasing the stirring time until the characteristic value CaO reaches the control index range, wherein the single measurement result does not exceed 2.0 percent of the control value of CaO.
Preferably, the product fineness control parameters in the third step are as follows: 2.0-20.0% of the residue of a 45-micron sieve, 0-3.0% of the residue of a 80-micron sieve and 300-460 m of specific surface area2/kg。
In the invention, the raw materials are required to meet the requirements of relevant standards and regulations, wherein, the clinker is required to meet the requirement of GB/T21372, and the active mixed material is a granulated blast furnace slag, granulated blast furnace slag powder, fly ash and pozzolanic mixed material with the activity indexes respectively meeting the requirements of GB/T203, GB/T18046, GB/T1596 and GB/T2847; the non-active mixed material is granulated blast furnace slag, granulated high slag powder, fly ash, a pozzolanic mixed material and sandstone with the activity indexes respectively lower than GB/T203, GB/T18046, GB/T1596 and GB/T2847; other waste residues include: the granulated blast furnace titanium slag, the granulated electric furnace phosphorus slag, the steel slag, the lithium slag and the kiln dust respectively meet the requirements of JC/T418, GB/T6645, YB/T022, YB/T4320 and JC/T742, and the non-ferrous metal ash, chips, tailings and waste stone solid wastes with the use conditions meeting the relevant national safety, environmental protection and sanitation requirements.
In the invention, the grinding aid, the cellulose ether, the re-dispersible latex powder, the early strength agent and the air entraining agent respectively meet the requirements of GB/T26748, JC/T2190, JC/T2189, GB8076 and GB 8076; the gypsum is natural gypsum or industrial by-product gypsum, the natural gypsum meets the G class or M class (including) or above gypsum specified in GB/T5483, and the industrial by-product gypsum meets the requirement of GB/T21371.
Compared with the prior art, the invention has the beneficial effects that:
(1) the raw material composition of the special cement for masonry mortar allows other waste residues not exceeding 0.08 part by mass of the cement to replace granulated blast furnace slag, fly ash and pozzolanic mixed materials, and takes pan limestone as a necessary material of the masonry cement, wherein the mixing amount of the limestone is 0.10-0.35 part by mass of the cement;
(2) the system provides a formula and a technical scheme of the special cement for masonry mortar, and in the process of preparing the masonry mortar by adopting the special cement for masonry mortar, admixture and functional additive (namely modified component) do not need to be doped again, and the special cement for masonry mortar is prepared and doped by professional processing of cement production enterprises, so that the homogeneity and micro-scale distribution of a cementing material system can be obviously improved, the mortar preparation process can be simplified, the construction work efficiency is improved, and the special cement for masonry mortar has a good application prospect;
(3) according to the invention, a series of special modified components are researched, and the corresponding modified components are selected according to the performance requirements of the mortar special cement, the types of mixed materials, the quality of clinker and the components, and the cellulose ether has the characteristics of suspension stability and easiness in forming high-viscosity solution, so that the water retention property and the workability of the mortar special cement are improved; the redispersible latex powder can improve the fluidity of the cement paste, properly prolong the initial setting, ensure the final setting to be relatively stable, and properly increase the water retention property, thereby increasing the binding power of the mortar and facilitating the construction; the air entraining agent can generate a large amount of stable and uniform bubbles, so that the mortar has good workability, is convenient for construction and improves other performances; the early strength agent has the characteristic of improving the early strength of the mortar, and overcomes the defect of low common early strength of the masonry mortar;
(4) the invention adopts a combined cement cooling device and a method, and adopts the technical principle and the method of the special device, wherein on the basis of implementing less water spraying to the mill, water spraying in the mill and water spraying outside the mill, a large refrigeration air machine provides low-temperature compressed air at 5-15 ℃ as a cooling medium, an air chute for conveying cement and a centrifugal fan are modified, the cement in the air chute is directly cooled by cold air, or a spiral conveying reamer is modified and installed on a water tank and is indirectly cooled by external circulating water, so that the temperature of the cement can be reduced to below 60 ℃, the modified components are favorably doped, the damage to the molecular structure of the modified components is avoided, the compatibility of the cement and the modified components is improved, and various performances of the modified components can be improved by ;
(5) aiming at the problems of the traditional cement production process flow, such as the common adoption of large-scale storage bins, small quantity, no basic configuration of mixed materials and semi-finished product micro powder bins in most enterprises, and the corresponding material bins, metering and other facilities and equipment, the process condition of admixture doping or the related process condition is extremely imperfect; therefore, it is difficult to prepare admixture and multi-specification mortar special cement. The traditional separate grinding preparation method is optimized, a secondary ingredient mixing and homogenizing system is additionally and improved, the process conditions for preparing the special cement for the differential and multi-type mortar are met, and the product adaptability is improved;
(6) in the process of secondary mixing and homogenization, an automatic control system special for can be adopted to detect and control the uniformity of the product, and the uniformity coefficient (standard deviation of CaO characteristic value) of the cement discharged from a factory is improved by 20 percent compared with the traditional method;
(7) in the preparation process, pre-homogenization measures of tiling, vertical cutting and matching use are adopted before all raw materials are put into a warehouse (mill), the proportioning technical scheme is optimized according to the required product performance, the characteristic function of modified components, the quality of clinker and the properties of mixed materials, the specific surface area, the fineness, the gradation, the morphology and the CaO characteristic value of each component or pre-mixed micro powder, and the actual proportioning and control parameters are adjusted in time so as to fully exert the optimized compounding and overlapping effects of each component;
(8) the mortar prepared by the special cement for masonry mortar has the effects of easy mixing, easy smearing, good water retention property, no bleeding, no layering, no hollowing and the like.
Drawings
FIG. 1 is a schematic view of a process flow for preparing cement special for masonry mortar.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only some embodiments, but not all embodiments, of the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In this embodiment, the powder selecting device is a breaking classifier and a powder selecting machine, and the grinding device includes a roller press and a ball mill, wherein the roller press is used as a pre-grinding device.
The cement product is fine in this exampleDegree control parameters: 2.0-20.0% of the residue of a 45-micron sieve, 0-3.0% of the residue of a 80-micron sieve and 300-460 m of specific surface area2/kg。
Example 1:
cement special for masonry mortar, which comprises the following raw materials in proportion of 0.15 part of clinker, 0.04 part of gypsum, 0.10 part of limestone, 0.0002 part of grinding aid (liquid), 0.40 part of granulated blast furnace slag, 0.08 part of silicomanganese slag (other waste residues), 0.20 part of fly ash, 0.02 part of slag (pozzolanic material), 0.001 part of early strength agent and 0.0088 part of redispersible latex powder, wherein 1, 4-dihydroxyethyl piperazine raw liquid is used as the grinding aid (liquid), 1, 4-dihydroxyisopropyl piperazine and triethanolamine are used as the early strength agent for compounding, and ethylene-vinyl acetate copolymer is used as the redispersible latex powder, and the raw materials meet the relevant standards and the requirements.
The preparation method of kinds of special cement for masonry mortar comprises the following steps:
step , selecting the above raw materials, placing the raw materials into a clinker warehouse, a gypsum warehouse and a plurality of warehouses for different mixed materials respectively by adopting a pre-homogenization measure of tiling, vertical cutting and matching, and storing the grinding aid and the modified component respectively for later use by using a storage tank;
step two, adopting a respective grinding mode B, forming groups of pre-prepared clinker, gypsum and grinding aid, forming groups of pre-prepared granulated blast furnace slag, silicomanganese slag, furnace slag, limestone and grinding aid, respectively adding the materials into grinding equipment for grinding after metering according to the ingredients, and separating micro powder reaching the required fineness from the ground materials by using powder selection equipment to obtain the clinker micro powder and composite mixed material micro powder with the constant temperature of ;
controlling parameters of the fineness of the clinker micropowder: 5.0-15.0% of residue on a 45 mu m sieve, 0.5-2.0% of residue on a 80 mu m sieve, and 320-380 m of specific surface area2Per kg; the fineness control parameters of the micro powder of the composite admixture are as follows: 0-10.0 percent of screen residue of a 45 mu m screen, 0-1.5 percent of screen residue of an 80 mu m screen and 380-480 m of specific surface area2/kg；
Step three, adjusting production control parameters according to the design formula and the components, clinker micro powder, composite mixed material micro powder, specific surface area and characteristic value CaO, adding the early strength agent, the redispersible emulsion powder and the two micro powders in the step two into a mixer after secondary batching and metering, and stirring under the condition that the temperature does not exceed 60 ℃ to obtain a finished product;
the fineness control parameters of the special cement for masonry mortar are as follows: 2.0-10.0 percent of screen residue of a 45 mu m screen, 0.5-2.0 percent of screen residue of an 80 mu m screen and 415-450 m of specific surface area2/kg。
Example 2:
special cement for masonry mortar, which comprises the following raw materials in proportion of 0.22 part of clinker, 0.08 part of gypsum, 0.2765 parts of limestone, 0.001 part of grinding aid (liquid), 0.30 part of fly ash, 0.08 part of waste stone (other waste residues), 0.0415 parts of slag (pozzolana mixed material), and 0.001 part of early strength admixture, wherein the grinding aid (liquid) is prepared by compounding 1, 4-dihydroxyethylpiperazine and ethylene glycol, the cellulose ether is hydroxypropyl methyl cellulose ether, ethylene-vinyl acetate copolymer is used as emulsion powder, triisopropanolamine is used as an air entraining agent, the early strength admixture is prepared by compounding 1, 4-dihydroxyisopropylpiperazine and calcium acetate, and the raw materials of the components meet the relevant standards and the requirements.
The preparation method of kinds of special cement for masonry mortar comprises the following steps:
step , selecting the above raw materials, placing the raw materials into a clinker warehouse, a gypsum warehouse and a plurality of warehouses for different mixed materials respectively by adopting a pre-homogenization measure of tiling, vertical cutting and matching, and storing the grinding aid and the modified component respectively for later use by using a storage tank;
step two, adopting a respective grinding mode B, forming groups of pre-prepared materials by using clinker, gypsum and grinding aid, forming groups of pre-prepared materials by using limestone, fly ash, furnace slag, waste stone, furnace slag and grinding aid, respectively metering the pre-prepared materials according to the mixture ratio, adding the pre-prepared materials into grinding equipment for grinding, and separating micro powder reaching the required particle size from the ground materials by using powder selecting equipment to obtain constant-temperature clinker micro powder and composite admixture micro powder;
controlling parameters of the fineness of the clinker micropowder: 5.0-10.0% of screen residue of a 45 mu m screen, 0.5-2.0% of screen residue of an 80 mu m screen and 320-380 m of specific surface area2Per kg; the fineness control parameters of the micro powder of the composite admixture are as follows: 0-10.0 percent of screen residue of a 45 mu m screen, 0-1.5 percent of screen residue of an 80 mu m screen and 380-480 m of specific surface area2/kg；
Step three, adjusting production control parameters according to the design formula and the components, clinker micro powder, composite mixed material micro powder, specific surface area and characteristic value CaO, adding the early strength agent and the two types of micro powder in the step two into a mixer after secondary batching and metering, and mixing under the condition that the temperature does not exceed 60 ℃ to obtain a finished product;
the fineness control parameters of the special cement for masonry mortar are as follows: 2.0-10.0% of residue on a 45 mu m sieve, 0.5-2.0% of residue on a 80 mu m sieve, and 380-445 m of specific surface area2/kg。
Example 3:
cement special for masonry mortar, which comprises the following raw materials in proportion of 0.40 part of clinker, 0.0685 part of anhydrite, 0.35 part of limestone, 0.005 part of grinding aid (powder), 0.01 part of early strength agent, 0.005 part of cellulose ether, 0.04 part of redispersible latex powder and 0.0015 part of air entraining agent, 0.12 part of slag (volcanic ash mixed material), wherein the grinding aid (powder) is prepared by compounding 1, 4-dihydroxyethyl piperazine and sodium thiocyanate, the cellulose ether uses hydroxypropyl methyl cellulose ether, the redispersible latex powder uses ethylene-vinyl acetate copolymer, the air entraining agent uses sodium dodecyl benzene sulfonate, the early strength agent uses 1, 4-dihydroxyisopropyl piperazine and calcium acetate, and the raw materials of the components meet the relevant standards and the requirements.
The preparation method of kinds of special cement for masonry mortar comprises the following steps:
step , selecting the above raw materials, placing the raw materials into a clinker warehouse, a gypsum warehouse and a plurality of warehouses for different mixed materials respectively by adopting a pre-homogenization measure of tiling, vertical cutting and matching, and storing the grinding aid and the modified component respectively for later use by using a storage tank;
step two, adopting a mixed grinding mode A, adding the clinker, the anhydrite, the limestone, the furnace slag and the grinding aid into grinding equipment for grinding together after proportioning, and obtaining the cement micropowder meeting the required fineness through powder selection equipment;
and step three, according to a designed formula, adding the cellulose ether, the redispersible latex powder, the air entraining agent and the early strength agent and the cement micro powder obtained in the step two into a mixer after proportioning and metering, and stirring at the temperature of not more than 60 ℃ to obtain the special cement for the masonry mortar.
The fineness control parameters of the special cement for masonry mortar are as follows: 8.0-20.0 percent of screen residue of a 45 mu m screen, 0.5-3.0 percent of screen residue of an 80 mu m screen and 330-360 m of specific surface area2/kg。
The special cement for masonry mortar in the above example was subjected to chemical and physical property tests, and the test results are shown in table 1.
TABLE 1 Cement specially for masonry mortar
The product of the invention has good adaptability, various performances and uniformity of the prepared masonry cement mortar are greatly improved, the implementation scheme focuses on combining with the actual conditions of the industry, the investment is small, application is convenient to push, the operability is strong, and the comprehensive technical scheme has great innovation.
The invention provides a formula and a production technical scheme of a cementing material, namely special cement for masonry mortar, in cement-based mortar, a key process and a control device, greatly improves the problem of homogeneity of a cementing material system caused by doping a large amount of admixture again when the mortar is premixed or prepared on site, and is beneficial to selecting mixed material resources; when the masonry mortar is prepared, no admixture or corresponding modification component is needed to be added.
Aiming at special cement for masonry mortar, corresponding modified components are researched by , and the product has good adaptability, and the modified grinding-aid components have the functions of grinding aid, water retention, slump loss prevention and air entrainment, and are prepared by compounding with a special production device , so that the construction operation is simplified, and the construction efficiency is improved.
Aiming at the problems of the traditional cement production technology, the invention optimizes the traditional separate grinding preparation method, adds and improves a secondary batching, mixing and homogenizing system, and adopts a special cement cooling method and a special cement cooling device. Has corresponding process conditions, and can conveniently prepare different and various masonry cement products.
The invention can also adopt an automatic control system specially used for to detect and control the uniformity of the product, and the uniformity coefficient of the cement discharged from a factory is improved by 20 percent compared with that of the cement discharged from a traditional method.
The above description of the embodiments is provided to facilitate one of ordinary skill in the art in understanding and using the present invention, as well as the grinding and preparation stations (plants) that can use the patented technology to purchase commercial cement directly and omit the cooling process to produce masonry mortar proprietary cement encompassed by the patent.
Claims (7)
- The cement special for the masonry mortar is characterized by comprising, by mass, 0.15-0.40 parts of clinker, 0.04-0.08 parts of gypsum, 0.10-0.35 parts of limestone, 0.0002-0.005 parts of grinding aid, 0.001-0.0565 parts of modification component, 0.12-0.70 parts of active or inactive mixed materials including granulated blast furnace slag, granulated blast furnace slag powder, fly ash and pozzolana mixed materials, 0-0.08 parts of other waste residues are allowed to replace the active mixed materials, the grinding aid is prepared by compounding 0.001-0.01 parts of early strength agent, 0-0.005 parts of cellulose ether, 0.04 parts of emulsion powder, 0.04 parts of latex powder, 0.0015 parts of latex powder, 0.5 parts of ethylene acetate-ethylene-vinyl acetate copolymer, 0.5 parts of ethylene-propylene carbonate copolymer, 0.5 parts of ethylene-vinyl acetate copolymer, 0.5 parts of ethylene-propylene carbonate copolymer, 0.5 parts of ethylene-ethylene acetate copolymer, 0.5 parts of ethylene-propylene carbonate copolymer, 0.5 parts of ethylene acetate copolymer, ethylene-ethylene carbonate copolymer, 0.5 parts of ethylene carbonate copolymer of ethylene acetate copolymer, 0.5 parts of ethylene carbonate copolymer, ethylene carbonate copolymer of ethylene carbonate copolymer, 0.5-3 parts of ethylene carbonate copolymer, ethylene carbonate copolymer of ethylene carbonate copolymer, 0.5-ethylene carbonate copolymer of ethylene carbonate copolymer, 0.5 parts of ethylene acetate copolymer, ethylene carbonate copolymer of ethylene carbonate, ethylene carbonate copolymer of ethylene carbonate.
- 2. The special cement for masonry mortar of claim 1, wherein the other waste residues include granulated blast furnace titanium slag, granulated electric furnace phosphorous slag, steel slag, kiln dust, silicomanganese slag, lithium slag, and waste concrete, chips, tailings, waste stone solid wastes whose use conditions meet the national relevant safety, environmental protection and sanitation requirements, the content of tricalcium silicate in the clinker is more than 48.0%, the total amount of silicate minerals is more than or equal to 66.0%, the content of aluminum oxide in the limestone is less than or equal to 2.5%, and the content of calcium carbonate is more than 75.0%.
- 3. The preparation method of cements special for masonry mortar according to any of the claims 1-2 and , comprising the following steps:step , raw material preparation, namely selecting the clinker, the gypsum, the limestone, the granulated blast furnace slag powder, the fly ash, the pozzolanic mixed material and other waste residues or non-active mixed materials, respectively storing the materials into a clinker warehouse, a gypsum warehouse and a mixed material warehouse by adopting a pre-homogenization measure of tiling, vertical cutting and matching use, and respectively storing the grinding aid and the modified component for later use by using a storage tank;step two, grinding raw materials: two ways are adopted: a mixed grinding mode A or a separate grinding mode B;a mixed grinding mode A is adopted, and the concrete operation steps are that the raw material components and the grinding aid in the step are added into grinding equipment according to the proportion for grinding together, cement micro powder with required fineness is obtained through powder selection equipment, and is treated by a cement cooling method, so that masonry cement micro powder without a modified component and not exceeding 60 ℃ is directly obtained, wherein the control parameters of the fineness of the cement micro powder are 8.0-20.0% of the residue of a 45-micron sieve and 0.5-3.0% of the residue of an 80-micron sieve;and a respective grinding mode B is adopted, and the specific operation steps are as follows: pre-mixing and grinding clinker, gypsum and grinding aid; pre-mixing and grinding the granulated blast furnace slag, the granulated blast furnace slag powder, other waste residues and a grinding aid; separately grinding limestone, a pozzolanic material, fly ash, an inactive mixed material or other waste residues or pre-mixing grinding raw materials with similar grindability and a grinding aid; respectively obtaining clinker micropowder, mixed material micropowder or composite mixed material micropowder with required fineness by powder selecting equipment; the control parameters of the fineness of the clinker micropowder are as follows: 5-15% of residue on a 45 mu m sieve, 0.5-2.0% of residue on an 80 mu m sieve, and 320-380 m of specific surface area2Per kg; the control parameters of the fineness of the mixed material micro powder or the composite mixed material micro powder are as follows: 0-10% of residue on a 45 mu m sieve, 0-1.5% of residue on an 80 mu m sieve, and 380-480 m of specific surface area2/kg；Step three, modification and compounding:if a separate grinding mode B is adopted, inputting the clinker micropowder, the mixed material micropowder or the composite mixed material micropowder obtained in the step two into a secondary batching warehouse, metering the clinker micropowder, the mixed material micropowder or the composite mixed material micropowder with the modified component according to the proportion, adding the mixture into a mixer for mixing, detecting and controlling the uniformity of the product, and putting the product doped with the modified component into a finished product warehouse;and if a mixed grinding mode A is adopted, inputting the cement micro powder obtained in the step two into a secondary batching storehouse, metering the cement micro powder and the modified components according to the proportion, adding the mixture into a mixer for mixing, detecting and controlling the uniformity of the product, and putting the obtained cement product special for the masonry mortar into a finished product storehouse.
- 4. The method for preparing the cement special for kinds of masonry mortar according to claim 3, wherein a combined cement cooling device is adopted in the cement cooling method, a large refrigeration air machine provides low-temperature compressed air with the temperature of 5-15 ℃ as a cooling medium, an air chute for conveying cement and a centrifugal fan are modified, the cement in the air chute is directly cooled by cold air, or a spiral conveying reamer is modified and installed on a water tank for external circulating water cooling, so that the temperature of the cement is reduced to below 60 ℃.
- 5. The method for preparing kinds of cement special for masonry mortar according to claim 3, wherein the secondary blending in step three is carried out by adding secondary blending process facilities on the basis of traditional cement production process, blending, mixing and homogenizing the cooled cement micropowder after grinding, the admixture micropowder and the modifying component.
- 6. The method for preparing cements special for masonry mortar according to claim 3, wherein the method for detecting and controlling the homogeneity of the products in the third step comprises the steps of collecting cement samples mixed by a mixer by using a continuous automatic sampler, measuring CaO times per 1 hour, feeding the detection information back to a batching control system, automatically adjusting the proportion of the clinker powder and the mixed powder or increasing the mixing time until the characteristic value CaO reaches the control index range, and obtaining a single measurement result which is not more than 2.0% of the control value of CaO.
- 7. The preparation method of special cements for masonry mortar according to claim 3, characterized in that the fineness control parameters of the products in the third step are 2.0% -20.0% of the residue of 45 μm sieve, 0% -3.0% of the residue of 80 μm sieve, and 300-460 m specific surface area2/kg。
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| CN110451826B (en) * | 2019-09-18 | 2020-08-07 | 王紫娴 | 32.5 mixed portland cement for rural towns and anti-crack concrete and preparation method thereof |
| CN112279610A (en) * | 2020-10-27 | 2021-01-29 | 新疆五洲集团有限公司 | Production method for producing concrete composite mineral admixture by using industrial waste residues |
| CN112624638A (en) * | 2020-12-29 | 2021-04-09 | 响水中联水泥有限公司 | Cement formula |
| CN112897910A (en) * | 2021-04-25 | 2021-06-04 | 王程程 | Preparation method of environment-friendly cement by using construction waste |
| CN113060952A (en) * | 2021-05-17 | 2021-07-02 | 乐陵山水水泥有限公司 | Cement for building and production process thereof |
| CN113955957A (en) * | 2021-10-15 | 2022-01-21 | 华润水泥(平南)有限公司 | Cement for road cushion and preparation method thereof |
| CN113860767A (en) * | 2021-10-19 | 2021-12-31 | 广西都安西江鱼峰水泥有限公司 | High-doped inferior waste residue masonry cement and production method thereof |
| CN115321849B (en) * | 2022-08-04 | 2023-09-22 | 四川利森建材集团有限公司 | Silicon-manganese slag-limestone composite low-carbon gelling material and application thereof |
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| CN102837361B (en) * | 2012-09-25 | 2015-11-04 | 北京新奥混凝土集团有限公司 | A kind of new concrete production technology |
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