CN109553327B - Concrete additive and preparation method and application thereof - Google Patents
Concrete additive and preparation method and application thereof Download PDFInfo
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- CN109553327B CN109553327B CN201910035991.XA CN201910035991A CN109553327B CN 109553327 B CN109553327 B CN 109553327B CN 201910035991 A CN201910035991 A CN 201910035991A CN 109553327 B CN109553327 B CN 109553327B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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Abstract
The invention relates to a concrete additive and a preparation method and application thereof. The raw materials comprise: one or more of a water reducing component, an expanding component, a retarding component, an early strength component, an air entraining component, an antifreezing component and a waterproof component; the concrete admixture comprises a water reducing component, an expanding component, a retarding component, an early strength component, an air entraining component, an antifreezing component and a waterproof component, wherein the water reducing component is used for reducing the water consumption of a mixture, the expanding component is used for enabling the concrete to slightly expand, the retarding component is used for delaying the hydration reaction of a cementing material, the early strength component is used for accelerating the early strength of the concrete, the air entraining component is used for improving the frost resistance and/or durability of the concrete, the antifreezing component is used for improving the frost resistance of the concrete, and the waterproof component. The additive is used in concrete, can obviously improve the mechanical property of the concrete, and obviously reduces the using amount; it is suitable for the preparation of various high-performance concretes, such as concretes of high-speed rail, subway, highway, maritime work, port work and the like; it is suitable for preparing high-fluidity and self-compacting concrete, etc.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a concrete additive and a preparation method and application thereof.
Background
In recent years, with the expansion of urban construction scale and the leap of construction speed, in the 80 th century of 20 th century in Guangdong province, Shenzhen and Guangzhou have built a large number of concrete mixing plants. The premixed concrete shows the development of cities, including one-year-less, three-year-one-middle and ten-year-great changes. Meanwhile, in order to eliminate the laggard field mixing concrete, the businessman reforms the notice of forbidding the field mixing concrete in urban areas for a limited period of time by the No. 2003 341: in 124 city districts such as Beijing, the field stirring of concrete is forbidden from 12 and 31 days in 2003, and in other provincial (autonomous region) direct municipalities, the field stirring of concrete is forbidden from 12 and 31 days in 2005.
Premixed concrete: the concrete admixture is a concrete admixture which is prepared by mixing cement, aggregate, water, additives and mineral admixtures which are mixed according to needs in a certain proportion at a centralized mixing plant (factory), is sold after being metered and mixed, and is transported to a use place within a specified time by a transport vehicle (GB/T14902-2012 'premixed concrete'). The standard specifies that concrete placement, tamping and curing after delivery to the delivery location are not included.
The difference between traditional concrete and modern scientific concrete is as follows: the first commercial concrete plant in the world was established in 1903 in Germany, and the first premixed commercial concrete station in China was established in Beijing, Shanghai and Changzhou in 1978. This has been preceded by on-site mixing, known as conventional concrete. The traditional concrete is characterized in that; because of the large particle size of the adopted stones, the water consumption is small, the cement consumption is small, the slurry amount is small, the slump is small, the strength grade is small, and the sand rate is small. So that the occurrence of cracks is relatively small due to the small shrinkage of the concrete. Although the production efficiency is low, the constructors can have enough time to carry out concrete pouring, vibrating, plastering, grouting and watering maintenance in a non-construction period, and the construction process is carefully and thoroughly completed. The quality of the concrete is relatively much less of an issue.
(II) modern scientific concrete
In the modern times, with the endless development of new processes, new varieties, new technologies and new equipment, modern scientific concrete has been increased from four components to six components, even eight to nine components, of traditional concrete, i.e. in addition to water, cement, sand and stone, expansion agents, fiber and mineral admixtures (fly ash, mineral powder, silica powder and the like) and various additives (early strength agents, water reducing agents, retarders, air entraining agents, pumping agents and the like) are added into the concrete.
Although the premixed concrete has advancement and scientificity and is called as modern scientific concrete, some problems also exist; such as: (1) slump fluctuation, the main causes include: firstly, the distance from the factory to the construction site is influenced by the transportation distance and the transportation time; ② influenced by air temperature and climate; affected by the adaptability of the admixture and the cement; influence of materials such as sand, stone, cement and the like, such as fluctuation of thickness and water content of the sand, and influence of temperature of cement entering a factory; fifthly, the material viewing error is large; provision of GB/T14902-2012 premixed concrete: if the slump is larger than 100mm, the error is +/-30 mm, but the feasibility of construction is not considered when the slump is signed up, the error of the slump is +/-10 mm, if the slump is 140-160 mm (150 +/-10 mm) required by construction and the standard specification is 150 +/-30 mm, namely 120-180 mm, the slump is judged to be qualified. Slump measurement using a slump cone has been carried out for 80 years, and until now there is no reliable method. A stone 30mm large, two different persons have very different SL values measured from different parts of a vehicle. And the use rate of each batch of sand, stone and cement is limited. (2) Intensity fluctuations, the main causes include: the GB50081-2002 standard stipulates that the standard curing condition of the test block in the 28-day age is that the temperature is 20 +/-1 ℃, the humidity is more than 95 percent, a standard curing room is not arranged on a construction site, the water temperature is generally 5-10 ℃ in winter, and the strength of the test block is only 80 percent under the standard curing condition on the assumption that the test block is soaked in water for 28 days. The water temperature is up to more than 30 ℃ in summer, but the small pool of the construction site is soaked for a few days and then taken out to be placed in the air for insolation and dehydration, and the strength of the test block is only 80% under standard culture conditions. ② the construction site sampling is not in accordance with GB/T14902-2002The sample is taken in 1/4-3/4 of the same mixer truck and is not less than 0.02m3And stirring uniformly; thirdly, the size of the test mold of the construction site does not meet the specification of the GB/T50081-2002 standard, some test mold forms edges and corners, and some test mold bottom plates deform; fourthly, the molded test piece does not meet the regulation in the GB50081/T-2002 standard, and a tester is not trained by the on-duty certificate; the slump fluctuation of the concrete leaving a factory is too large; (too small, the strength can not be influenced by adding additives for adjustment), the sampling is not representative, the strength is influenced by 28 days, and the vehicle should be returned; sixthly, the material changes greatly, particularly the cement and the additive are not adjusted in proportion, and the stirring station is required to evaluate the quality of the produced concrete and check the production equipment regularly according to GBJ/T50107-2010. (3) Quality fluctuations, the main causes include: firstly, the setting time is too long to influence the mold folding time or the setting promotion is not as good as the plastering time; secondly, the component has local leakage or broken plates; cold seam or broken pile is caused by the fact that the vehicle cannot be kept up; fourthly, the mixture is hardened and the bottom is grabbed to cause pump plugging and pipe plugging due to the super-doping of the additive; various cracks appear; sixthly, the construction period is shortened, the turnover of the template is fast, and a plurality of quality problems are caused because the early-sale building requires that the design strength is improved or the early strength reaches 80 to 100 percent of the design strength.
The concrete additive can promote the development of concrete technology. With the continuous development of economy, the building requirements are higher and higher, and the material concrete for building application is also higher in requirements. With the widespread use of concrete additives, the negative impact of the additives is also very great. Many concrete additives cannot achieve the expected effect after being applied, and have certain influence on economic benefit. In severe cases, engineering accidents occur, such as: the concrete has bleeding phenomenon and concrete slump; layering and isolating cement slurry; the shrinkage cracking phenomenon occurs when the hardened concrete shrinks more. The reason for analyzing the situations is that besides the reason of the concrete, the reason of some construction technicians is not well understood about the operation mechanism of the engineering, the performance of different additives is not fully understood, and the improper use causes accidents.
Based on the concrete additive, a novel concrete additive, a preparation method and application thereof are provided, and favorable conditions can be provided for increasing market competitiveness in the building material industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a concrete additive and a preparation method and application thereof. The additive is used in concrete, can obviously improve the mechanical property of the concrete, and obviously reduces the using amount; it is suitable for the preparation of various high-performance concretes, such as concretes of high-speed rail, subway, highway, maritime work, port work and the like; it is suitable for preparing high-fluidity and self-compacting concrete, etc.
Therefore, the invention provides the following technical scheme:
in a first aspect, the present invention provides a concrete additive, the raw materials of the additive comprising: one or more of a water reducing component, an expanding component, a retarding component, an early strength component, an air entraining component, an antifreezing component and a waterproof component; the water reducing component is used for reducing the water consumption for mixing, the expanding component is used for enabling concrete to slightly expand, the slow-setting component is used for delaying the hydration reaction of a cementing material, the early-strength component is used for accelerating the early strength of the concrete, the air entraining component is used for improving the frost resistance and/or durability of the concrete, the anti-freezing component is used for improving the frost resistance of the concrete, and the waterproof component is used for reducing the water permeability of the concrete.
Preferably, the raw material components of the concrete additive comprise, by weight: 5-50 parts of titanium dioxide, 5-10 parts of pentaerythritol, 0.1-0.3 part of sodium bisulfite, 5-20 parts of silane coupling agent, 5-10 parts of potassium carbonate, 15-80 parts of polycarboxylic acid water reducing agent, 1-3 parts of sodium lignosulfonate, 1-5 parts of sodium dodecyl benzene sulfonate, 1-5 parts of polyvinyl alcohol and 200-500 parts of water.
Preferably, the raw material components of the concrete additive comprise, by weight: 5-20 parts of titanium dioxide, 6-8 parts of pentaerythritol, 0.1-0.2 part of sodium bisulfite, 5-20 parts of a silane coupling agent, 5-8 parts of potassium carbonate, 20-60 parts of a polycarboxylic acid water reducing agent, 1-2 parts of sodium lignosulfonate, 1-3 parts of sodium dodecyl benzene sulfonate, 2-4 parts of polyvinyl alcohol and 300-500 parts of water.
Preferably, the raw material components of the concrete additive further comprise: 5-15 parts of hydroxypropyl methyl cellulose, 1-5 parts of potassium aluminum sulfate and 0.5-0.8 part of pentaerythritol stearate.
Preferably, the silane coupling agent is vinyltrimethoxysilane.
In a second aspect, the present invention provides a method for preparing a concrete additive, comprising the steps of: s1: weighing the raw material components in proportion, uniformly mixing, adjusting the pH value to 5.8-6.2, and then heating; s2: and adjusting the pH value of the product obtained in the step S1 to 7.2-7.6, heating again, and cooling to room temperature to obtain the concrete additive.
Preferably, in S1, the heating temperature is 60-80 ℃, and the heating time is 30-100 min.
Preferably, in S2, the heating temperature is 90-100 ℃, and the heating time is 20-50 min.
In the third aspect, the additive provided by the invention is applied to the preparation of high-performance concrete, and the additive is directly and uniformly dispersed in the concrete to obtain a concrete finished product; wherein the dosage of the additive accounts for 0.1-3% of the total mass of the cementing material.
Preferably, the use method of the concrete of the invention comprises the following steps: pouring, smashing, wiping and pressing and moisturizing maintenance procedures; in the moisture-preserving curing process, the temperature difference between the inside and the outside is controlled at 25 ℃, temperature control monitoring is carried out in the whole construction process, the concrete after plastering, slurry collecting, compacting and hardening is subjected to heat preservation in time, and the moisture-preserving curing is carried out for not less than 14 days. In particular, the use of concrete requires, at the time of construction, the knowledge of: casting and vibrating requirements: firstly, whether template support, steel bar binding and protective layer cushion blocks meet requirements or not needs to be checked before concrete is poured, and water is not accumulated in a bottom die so as to avoid the quality problem caused by influence on the uniformity of the concrete. And selecting reasonable pouring time. Secondly, the pouring height of the concrete is not more than 2m, otherwise, a cylinder or a chute is adopted, and the pouring of the concrete is not suitable for leading the mixture to concentrate heat and disperse the material by organizing personnel so as to avoid the disadvantages of concentrated load damage to the support of the template or heat dissipation. Thirdly, when the wall column, the beam and the plate are poured, columns and walls with high strength grade are poured firstly, and beam and plate concrete is poured simultaneously after pouring. After the wall column is poured, if floating slurry occurs, the wall column should be cleaned in time so as to prevent new and old concrete from generating faults. And fourthly, reasonably selecting the frequency and the diameter of the vibrating rod according to the vibrating part, wherein the moving distance of the vibrating rod is not more than 1.5 times of the acting radius of the vibrating rod, the vibrating rod is suitable for being inserted and pulled out quickly and slowly, the vibrating time is generally 10-30 seconds until bubbles are generated during grout turnover according to different slump degrees, and the vibrating rod is inserted into the lower layer of concrete for more than 50mm during layered vibration. When a flat vibrator is used, the distance of movement is such that the flat plate of the vibrator covers the edge of the vibrated portion. Excessive vibration is not needed in the pouring process, so that stones are prevented from sinking, excessive fly ash on the surface is prevented from floating upwards, plastic cracks on the surface are easy to appear after the concrete is hardened, and vibration leakage or insufficient vibration is avoided, so that the generation of honeycomb pitted surface is prevented, and the strength of the concrete is weakened.
The requirements of plastering and maintaining are as follows: firstly, before the concrete is finally set, measures such as plastering, collecting slurry and compacting are adopted immediately, the duration of a fire is mastered according to the slurry and the climate, and before the concrete is initially set, a wooden trowel is used for immediately carrying out secondary plastering to remove the water floating slurry, block capillary pores and prevent the internal water from continuously evaporating so as to avoid surface plastic cracks. Before the concrete is finally set, the concrete is rubbed and pressed back and forth by a wooden trowel to make the surface rough and have no floating slurry, and the member with large surface coefficient is compacted by a flat vibrator or a light collecting machine. When the concrete is finally set, the water-repelling pressure-smearing crack already exists. And watering and curing the hardened concrete in time for at least moisture retention and water retention for at least 7 days, and preferably maintaining the large-volume concrete doped with the expanding agent in animal water for at least 14 days. Heat preservation, moisture preservation and temperature control measures should be taken for the mass concrete according to the air temperature. Thirdly, the hardened concrete can also adopt plastic cloth to cover the whole surface tightly and dew in the cloth is kept. If the surface of the concrete is inconvenient to water or cover with plastic cloth, a curing agent can be smeared to prevent the water in the concrete from evaporating. Fourthly, the strength of the hardened concrete is less than 1.2Mpa, people are strictly prohibited to get on the concrete, and building materials are piled up, so that cracking caused by premature concentrated load is avoided.
The technical scheme provided by the invention has the following advantages:
(1) the additive is used in concrete, can obviously improve the mechanical property of the concrete, and obviously reduces the using amount; it is suitable for the preparation of various high-performance concretes, such as concretes of high-speed rail, subway, highway, maritime work, port work and the like; it is suitable for preparing high-fluidity and self-compacting concrete, etc.
(2) The traditional concrete additive has a plurality of defects; for example: the design of the mixing proportion is lack of scientificity, no theoretical knowledge nor practical experience exists, so the difference between the test mixing proportion and the construction mixing proportion is large, the reason is that the material change is large during production, most common is that the slump is unstable, sand is coarse, and the workability is poor to cause bleeding, slurry and aggregate are separated, pipe plugging or stone sinking after vibration is carried out, the slurry floats upwards, and plastic cracks are formed after hardening; in the traditional construction process, in order to meet the strength requirement, the cement consumption is large, the hydration heat is large, and temperature cracks are caused; after being vibrated, the stones sink, are pulped and are accelerated to be condensed, and the stones crack after being smeared; the traditional admixture has small water reducing rate, in order to meet the construction requirement, the slump is improved by adding water, and consequently, the pulverized fuel ash floats upwards after being vibrated to cause plastic cracks; the cement temperature in the factory is as high as about 100 ℃, so that the slump loss is fast, and the pumped material is fast condensed and cracks before plastering. The concrete additive provided by the invention can effectively overcome the defects, has excellent performance, can meet the requirements of construction process, strength and durability, and is economical and reasonable in construction mixing ratio.
(3) The high-performance concrete obtained by the additive provided by the invention has excellent durability and volume stability; the mortar has high impermeability, high frost resistance and high volume stability, and does not generate alkali aggregate reaction; in addition, the shrinkage cracking is small, no crack or few cracks in the construction process.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The experimental procedures in the following examples are conventional unless otherwise specified. The test materials used in the following examples were purchased from a conventional reagent store unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
The invention provides a concrete additive which comprises the following raw material components, by weight, 5-50 parts of titanium dioxide, 5-10 parts of pentaerythritol, 0.1-0.3 part of sodium bisulfite, 5-20 parts of a silane coupling agent, 5-10 parts of potassium carbonate, 15-80 parts of a polycarboxylic acid water reducing agent, 1-3 parts of sodium lignosulfonate, 1-5 parts of sodium dodecyl benzene sulfonate, 1-5 parts of polyvinyl alcohol and 200-500 parts of water; and the raw material components preferably also comprise: 5-15 parts of hydroxypropyl methyl cellulose, 1-5 parts of potassium aluminum sulfate and 0.5-0.8 part of pentaerythritol stearate.
In addition, the applicant specifically provides a preparation method for the concrete additive provided by the invention, which comprises the following steps:
s1: weighing the raw material components in proportion, uniformly mixing, adjusting the pH value to 5.8-6.2, and then heating. Wherein the heating temperature is 60-80 ℃, and the heating time is 30-100 min.
S2: and adjusting the pH value of the product obtained in the step S1 to 7.2-7.6, heating again, and cooling to room temperature to obtain the concrete additive. Wherein the heating temperature is 90-100 ℃, and the heating time is 20-50 min.
In addition, the additive provided by the invention can be further used in the preparation process of concrete, and specifically comprises the following steps: directly and uniformly dispersing the additive in the concrete to obtain a concrete finished product; wherein the dosage of the additive accounts for 0.1-3% of the total mass of the cementing material.
The following description is made with reference to specific embodiments:
example one
The embodiment provides a concrete additive, which comprises the following raw material components in parts by weight: 20 parts of titanium dioxide, 6 parts of pentaerythritol, 0.2 part of sodium bisulfite, 5 parts of vinyl trimethoxy silane, 8 parts of potassium carbonate, 20 parts of polycarboxylic acid water reducing agent, 2 parts of sodium lignosulfonate, 1 part of sodium dodecyl benzene sulfonate, 4 parts of polyvinyl alcohol and 300 parts of water.
According to the raw material components, the concrete additive required by the invention is prepared:
s1: weighing the raw material components according to the proportion, uniformly mixing, adjusting the pH value to 5.8, and then heating. Wherein the heating temperature is 80 deg.C, and the heating time is 30 min.
S2: and (4) adjusting the pH value of the product obtained in the S1 to 7.6, heating again, and cooling to room temperature to obtain the concrete additive. Wherein the heating temperature is 90 deg.C, and the heating time is 50 min.
Example two
The embodiment provides a concrete additive, which comprises the following raw material components in parts by weight: 5 parts of titanium dioxide, 8 parts of pentaerythritol, 0.1 part of sodium bisulfite, 20 parts of vinyl trimethoxy silane, 5 parts of potassium carbonate, 60 parts of polycarboxylic acid water reducing agent, 1 part of sodium lignosulfonate, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of polyvinyl alcohol and 500 parts of water.
According to the raw material components, the concrete additive required by the invention is prepared:
s1: weighing the raw material components according to the proportion, uniformly mixing, adjusting the pH value to 6.2, and then heating. Wherein the heating temperature is 60 deg.C, and the heating time is 100 min.
S2: and (4) adjusting the pH value of the product obtained in the step (S1) to 7.2, heating again, and cooling to room temperature to obtain the concrete additive. Wherein the heating temperature is 100 deg.C, and the heating time is 20 min.
EXAMPLE III
The embodiment provides a concrete additive, which comprises the following raw material components in parts by weight: 20 parts of titanium dioxide, 6 parts of pentaerythritol, 0.2 part of sodium bisulfite, 5 parts of vinyl trimethoxy silane, 8 parts of potassium carbonate, 20 parts of polycarboxylic acid water reducing agent, 2 parts of sodium lignosulfonate, 1 part of sodium dodecyl benzene sulfonate, 4 parts of polyvinyl alcohol, 5 parts of hydroxypropyl methyl cellulose, 5 parts of potassium aluminum sulfate, 0.5 part of pentaerythritol stearate and 300 parts of water.
According to the raw material components, the concrete additive required by the invention is prepared:
s1: weighing the raw material components according to the proportion, uniformly mixing, adjusting the pH value to 5.8, and then heating. Wherein the heating temperature is 80 deg.C, and the heating time is 30 min.
S2: and (4) adjusting the pH value of the product obtained in the S1 to 7.6, heating again, and cooling to room temperature to obtain the concrete additive. Wherein the heating temperature is 90 deg.C, and the heating time is 50 min.
Example four
The embodiment provides a concrete additive, which comprises the following raw material components in parts by weight: 5 parts of titanium dioxide, 8 parts of pentaerythritol, 0.1 part of sodium bisulfite, 20 parts of vinyl trimethoxy silane, 5 parts of potassium carbonate, 60 parts of polycarboxylic acid water reducing agent, 1 part of sodium lignosulfonate, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of polyvinyl alcohol, 15 parts of hydroxypropyl methyl cellulose, 1 part of potassium aluminum sulfate, 0.8 part of pentaerythritol stearate and 500 parts of water.
According to the raw material components, the concrete additive required by the invention is prepared:
s1: weighing the raw material components according to the proportion, uniformly mixing, adjusting the pH value to 6.2, and then heating. Wherein the heating temperature is 60 deg.C, and the heating time is 100 min.
S2: and (4) adjusting the pH value of the product obtained in the step (S1) to 7.2, heating again, and cooling to room temperature to obtain the concrete additive. Wherein the heating temperature is 100 deg.C, and the heating time is 20 min.
In addition, in order to further highlight the advantages of the technical solution of the present invention, the following comparative examples were provided. The following comparative examples were all set on the basis of example three.
Comparative example 1
The comparative example provides a concrete additive, which comprises the following raw material components in parts by weight: 20 parts of titanium dioxide, 6 parts of pentaerythritol, 0.2 part of sodium bisulfite, 5 parts of vinyl trimethoxy silane, 8 parts of potassium carbonate, 20 parts of polycarboxylic acid water reducing agent, 2 parts of sodium lignosulfonate, 1 part of sodium dodecyl benzene sulfonate, 4 parts of polyvinyl alcohol, 5 parts of hydroxypropyl methyl cellulose, 5 parts of potassium aluminum sulfate, 0.5 part of pentaerythritol stearate and 300 parts of water.
According to the raw material components, the concrete additive required by the invention is prepared:
s1: weighing the raw material components in proportion, uniformly mixing, and then heating. Wherein the heating temperature is 80 deg.C, and the heating time is 30 min.
S2: and (4) adjusting the pH value of the product obtained in the S1 to 7.6, heating again, and cooling to room temperature to obtain the concrete additive. Wherein the heating temperature is 90 deg.C, and the heating time is 50 min.
Comparative example No. two
The comparative example provides a concrete additive, which comprises the following raw material components in parts by weight: 20 parts of titanium dioxide, 6 parts of pentaerythritol, 0.2 part of sodium bisulfite, 5 parts of vinyl trimethoxy silane, 8 parts of potassium carbonate, 20 parts of polycarboxylic acid water reducing agent, 2 parts of sodium lignosulfonate, 1 part of sodium dodecyl benzene sulfonate, 4 parts of polyvinyl alcohol, 0.5 part of pentaerythritol stearate and 300 parts of water.
According to the raw material components, the concrete additive required by the invention is prepared:
s1: weighing the raw material components according to the proportion, uniformly mixing, adjusting the pH value to 5.8, and then heating. Wherein the heating temperature is 80 deg.C, and the heating time is 30 min.
S2: and (4) adjusting the pH value of the product obtained in the S1 to 7.6, heating again, and cooling to room temperature to obtain the concrete additive. Wherein the heating temperature is 90 deg.C, and the heating time is 50 min.
In addition, in order to better evaluate the performance of the concrete additive of the invention, the additive prepared in each example and comparative example is further used in the preparation process of concrete: directly and uniformly dispersing the additive in the concrete to obtain a concrete finished product; wherein the dosage of the additive accounts for 0.5 percent of the total mass of the cementing material. The properties of the relevant concrete were then tested, and the specific data are shown in tables 1 and 2.
The concrete strength test method comprises the following steps: the concrete strength is evaluated according to GB/T50081-2002 Standard of mechanical Property test method of ordinary concrete, and concrete 7d, 28d and 56d are used for strength measurement respectively; the anti-freezing performance of the concrete is evaluated by referring to GB/T50082-2009 test method for long-term performance and durability of common concrete; in addition, slump and thermal conductivity of the concrete of each example and comparative example were measured.
Table 1 performance data of concrete of each example table one
TABLE 2 Property data of the concrete of the examples II
Of course, other process parameters, weight percentages of the raw material components, etc. are possible in addition to those exemplified in examples one to four.
The additive is used in concrete, can obviously improve the mechanical property of the concrete, and obviously reduces the using amount; it is suitable for the preparation of various high-performance concretes, such as concretes of high-speed rail, subway, highway, maritime work, port work and the like; it is suitable for preparing high-fluidity and self-compacting concrete, etc.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. The concrete additive is characterized by comprising the following raw materials:
20 parts of titanium dioxide, 6 parts of pentaerythritol, 0.2 part of sodium bisulfite, 5 parts of vinyl trimethoxy silane, 8 parts of potassium carbonate, 20 parts of polycarboxylic acid water reducing agent, 2 parts of sodium lignosulfonate, 1 part of sodium dodecyl benzene sulfonate, 4 parts of polyvinyl alcohol, 5 parts of hydroxypropyl methyl cellulose, 5 parts of potassium aluminum sulfate, 0.5 part of pentaerythritol stearate and 300 parts of water.
2. The method for preparing the concrete additive according to claim 1, comprising the steps of:
s1: weighing the raw material components in proportion, uniformly mixing, adjusting the pH value to 5.8-6.2, and then heating;
s2: and adjusting the pH value of the product obtained in the step S1 to 7.2-7.6, heating again, and cooling to room temperature to obtain the concrete additive.
3. The method for preparing a concrete additive according to claim 2, characterized in that:
in the step S1, the heating temperature is 60-80 ℃, and the heating time is 30-100 min.
4. The method for preparing a concrete additive according to claim 2, characterized in that:
in the step S2, the heating temperature is 90-100 ℃, and the heating time is 20-50 min.
5. Use of the additive according to claim 1 for the preparation of high performance concrete, characterized in that:
directly and uniformly dispersing the additive in concrete to obtain a finished concrete product; wherein the dosage of the additive accounts for 0.1-3% of the total mass of the cementing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910035991.XA CN109553327B (en) | 2019-01-15 | 2019-01-15 | Concrete additive and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910035991.XA CN109553327B (en) | 2019-01-15 | 2019-01-15 | Concrete additive and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109553327A CN109553327A (en) | 2019-04-02 |
| CN109553327B true CN109553327B (en) | 2021-03-23 |
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| KR101203919B1 (en) * | 2012-05-31 | 2012-11-22 | 최종윤 | Rapid hardening concrete composition modified with styrene-propenoate terpolymer latex, repairing method for concrete pavement using the same |
| CN103288375A (en) * | 2013-05-30 | 2013-09-11 | 河海大学 | Concrete additive and preparation method thereof |
| CN103601440A (en) * | 2013-10-29 | 2014-02-26 | 江苏名和集团有限公司 | C60 steel pipe self-compacting concrete |
| CN109111166A (en) * | 2018-03-23 | 2019-01-01 | 常州优纳新材料科技有限公司 | A kind of concrete composition |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101203919B1 (en) * | 2012-05-31 | 2012-11-22 | 최종윤 | Rapid hardening concrete composition modified with styrene-propenoate terpolymer latex, repairing method for concrete pavement using the same |
| CN103288375A (en) * | 2013-05-30 | 2013-09-11 | 河海大学 | Concrete additive and preparation method thereof |
| CN103601440A (en) * | 2013-10-29 | 2014-02-26 | 江苏名和集团有限公司 | C60 steel pipe self-compacting concrete |
| CN109111166A (en) * | 2018-03-23 | 2019-01-01 | 常州优纳新材料科技有限公司 | A kind of concrete composition |
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Effective date of registration: 20210421 Address after: 311400 Dongzhou industrial function zone, Fuyang District, Zhejiang, Hangzhou Patentee after: Zhejiang Dongzhou Concrete Co.,Ltd. Address before: 311401 Qijiasha Village, Dongzhou Street, Fuyang District, Hangzhou City, Zhejiang Province Patentee before: Liu Jinbiao |
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