CN112479675A - Volcanic ash based acid-resistant daub and preparation method thereof - Google Patents
Volcanic ash based acid-resistant daub and preparation method thereof Download PDFInfo
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- CN112479675A CN112479675A CN202011362977.XA CN202011362977A CN112479675A CN 112479675 A CN112479675 A CN 112479675A CN 202011362977 A CN202011362977 A CN 202011362977A CN 112479675 A CN112479675 A CN 112479675A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/23—Acid resistance, e.g. against acid air or rain
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides volcanic ash-based acid-resistant daub and a preparation method thereof, and solves the problems of poor construction performance, harsh construction conditions and high cost of the conventional acid-resistant daub. The preparation method of the volcanic ash-based acid-resistant daub comprises the following steps: step one, weighing the raw materials in parts by weight; cement: 13-18 parts; fly ash: 58-65 parts of a binder; water: 18-24 parts of a solvent; exciting agent: 0.6-1 part; potassium silicate: 1.8-2.7 parts; step two, stirring the cement, the fly ash and the excitant weighed in the step one to form a material A; step three, stirring the water weighed in the step one and the material A to obtain a material B; and step four, stirring the potassium silicate weighed in the step one and the material B to obtain the volcanic ash-based acid-resistant daub.
Description
Technical Field
The invention relates to acid-resistant daub, in particular to volcanic ash-based acid-resistant daub and a preparation method thereof.
Background
The acid-resistant daub is mainly used for corrosion-resistant structures of chemical engineering and electric power engineering, building, paving, pointing and the like of acid-resistant ceramic tiles, and the construction process of the acid-resistant daub is generally that acid-resistant powder, sodium (potassium) water glass and a curing agent are mixed on site according to a certain proportion and then constructed. A large number of engineering practices prove that the material has the following defects in the aspects of characteristics and construction process: 1) the sodium silicate is viscous and is easy to form a micro-sphere with acid resistance in the stirring process, so that the workability of the acid-resistant daub is greatly influenced, and the constructability of the acid-resistant daub is reduced; 2) the requirement on the construction environment temperature is too severe, the construction temperature of the water glass reverse corrosion engineering is preferably 15-30 ℃, the sodium water glass is not lower than 15 ℃, the potassium water glass is not lower than 20 ℃, and when the construction environment temperature is lower than 20 ℃, the setting time is long and the strength is low; when the construction environment temperature is higher than 30 ℃, the condensation time is extremely short, so that the construction is difficult; 3) the material cost is high, and the wet volume weight of the acid-resistant daub is about 2100Kg/m3The price of the acid-proof powder and the sodium silicate is about 4.6 yuan/Kg, and the material cost of the water glass acid-proof daub is about 9660 yuan/m3Left and right.
Disclosure of Invention
The invention aims to solve the problems of poor construction performance, harsh construction conditions and high cost of the conventional acid-resistant daub and provides a volcanic ash-based acid-resistant daub and a preparation method thereof.
In order to solve the above problems, the technical scheme of the invention is as follows:
the preparation method of the volcanic ash-based acid-resistant daub comprises the following steps:
step one, weighing the raw materials in parts by weight;
cement: 13-18 parts; fly ash: 58-65 parts of a binder; water: 18-24 parts of a solvent; exciting agent: 0.6-1 part; potassium silicate: 1.8-2.7 parts;
step two, stirring the cement, the fly ash and the excitant weighed in the step one to form a material A;
step three, stirring the water weighed in the step one and the material A to obtain a material B;
and step four, stirring the potassium silicate weighed in the step one and the material B to obtain the volcanic ash-based acid-resistant daub.
Further, in the step one, the raw materials are weighed according to the following parts by weight: cement: 15.3 parts of fly ash: 61.4 parts, water: 20.2 parts of an exciting agent: 0.8 part, potassium silicate: 2.3 parts.
Further, in the first step to the fourth step, the ambient temperature is 5 ℃ to 35 ℃.
Further, in the first step, the excitant is water glass.
Further, in the first step, the fly ash is ultrafine fly ash, the fineness of the fly ash is that the screen residue of a 45-micron sieve is less than or equal to 0.5 percent, the water requirement ratio is 100 percent, and the loss on ignition is 2.8 percent.
Meanwhile, the invention also provides volcanic ash-based acid-resistant daub which comprises the following raw materials in parts by weight: 13-18 parts; fly ash: 58-65 parts of a binder; water: 18-24 parts of a solvent; exciting agent: 0.6-1 part; potassium silicate: 1.8 to 2.7 portions.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the actual measurement sinking degree of the volcanic ash-based acid-resistant daub is 47mm, the performance of the mixture is uniform, the workability and the construction performance of the daub are good, and the environmental temperature and the humidity are normal temperature as the ordinary cement daub, so that the engineering application range and the construction universality of the volcanic ash-based acid-resistant daub are expanded, and the construction difficulty and the environmental harshness of the acid-resistant daub are greatly reduced.
2. The volcanic ash-based acid-resistant cement provided by the invention has the cost of water glass acid-resistant cement (9660 yuan/m)3) 1/15, the construction cost is greatly reduced.
3. The actually measured 7d compressive strength of the volcanic ash-based acid-resistant daub provided by the invention is 43.1MPa, and the 14d compressive strength is as follows: 52.4 MPa; the 14d flexural strength is: 5.9 MPa; the tensile strength is 3.5MPa and is far greater than the standard requirement of GB50212-2014 construction Specification for anti-corrosion engineering of construction.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The volcanic ash-based acid-resistant daub provided by the invention comprises the following raw materials in parts by weight: 13-18 parts; fly ash: 58-65 parts of a binder; water: 18-24 parts of a solvent; exciting agent: 0.6-1 part; potassium silicate: 1.8 to 2.7 portions. Preferably, the above parts ranges are as follows: 15.3 parts of fly ash: 61.4 parts, water: 20.2 parts of an exciting agent: 0.8 part, potassium silicate: 2.3 parts.
In the volcanic ash-based acid-resistant mortar, the fly ash is ultrafine fly ash, the fineness of the fly ash is 45 mu m, the screen residue is less than or equal to 0.5 percent, the water requirement ratio is 100 percent, and the loss on ignition is 2.8 percent. The activator can be water glass. The cement can be PO42.5 cement with the specific surface area of 350m2/kg and the water consumption of 135ml at the standard consistency.
| Phase difference | Component (Standard name) | Parts by weight | Purpose of use |
| A | Cement (PO) | 15.3 parts of | Gelling |
| B | Superfine fly ash | 61.4 parts | Gelling |
| C | Water (H)2O) | 20.2 parts of | Hydration of water |
| D | Exciting agent | 0.8 portion of | Excitation |
| E | Potassium silicate (K)2SiO3) | 2.3 parts of | Acid resistance |
The volcanic ash-based acid-resistant daub provided by the invention has the following characteristics: firstly, using ultrafine fly ash with volcanic ash effect, and utilizing the acid resistance and heat resistance of silicon dioxide and aluminum oxide of the ultrafine fly ash; secondly, water is used for replacing sodium silicate, and the sodium silicate is necessary hydration water for volcanic ash-based acid-resistant materials; thirdly, using an alkaline excitant to enhance the volcanic ash effect and form compact acid-resistant strength crystals; fourth, use very little potassium silicate (K)2SiO3) The capillary channel formed by the evaporation of the free water is filled, and the acid resistance of the daub is further improved, which is explained in detail below.
Firstly, the pozzolanic effect of the ultrafine fly ash is reduced by Si-O bond and Al-O bond under the action of an exciting agent, the reactivity is enhanced, and the pozzolanic effect is improved by hydration products Ca (OH) with cement2Hydration reaction takes place to produce hydraulic silicate colloid. The hydration reaction process of the ultrafine fly ash is also called secondary hydration, which lags behind the hydration reaction process of the cement clinker to ensure that the hydration reaction is carried outThe process elongates, the pozzolanic effect of the fly ash consuming on the one hand the hydration products Ca (OH) of the cement in the cement2Further reduces Ca (OH) in the cement2Content and basicity of (a); on the other hand, the secondary hydration products are filled in capillary pores of the hardened concrete, so that pores in the daub are refined, the structure is improved, the porosity is reduced, the compactness is increased, and the acid resistance of the daub is greatly improved. The wall breaking recombination characteristic of the ultrafine fly ash is utilized: after the fly ash is subjected to superfine grinding, the finer microbeads coated inside fly ash particles are released, and the fine microbeads are recombined under the action of an exciting agent to generate compact strength crystals, wherein except a glass phase, the fine microbeads also contain inert nano-quartz and mullite fibrous microcrystals, so that the acid resistance of the daub is further improved.
Secondly, water is used to replace the potash water glass as the hydration water for the pozzolan-based setting. After the cement is hydrated for 28 days, residual water in the cement is almost completely consumed, and the generated strength crystals almost completely consist of acid-resistant and heat-resistant materials.
And thirdly, the alkali excitant is used to infinitely enhance the volcanic ash effect of the volcanic ash-based cement gum, so that the reactions of 'secondary hydration' of the ultrafine fly ash and 'wall breaking recombination' of the microbeads are more sufficient under the action of the alkali excitant, and compact acid-resistant strength crystals are formed inside and outside the cement gum.
Finally, the volcanic ash-based acid-resistant daub belongs to a hydration gelation product, and a small amount of potassium silicate (K) is added due to the fact that a small amount of free water is evaporated and discharged to form a capillary channel after hydration and condensation in the daub2SiO3) The capillary channel formed by evaporation of free water is filled, and the acid resistance of the daub is further improved.
The cost of the volcanic ash-based acid-resistant daub is as follows: 633 yuan/m3(Jidong PO42.5 cement: 400 yuan/ton; ultrafine fly ash: 180 yuan/ton; excitant: 6000 yuan/ton; potassium silicate: 4600 yuan/ton), which is about the cost of the water glass acid-resistant mortar (9660 yuan/m)3) 1/15, the construction cost is greatly reduced.
The actual measurement sinking degree of the volcanic ash-based acid-resistant daub is 47mm, the performance of the mixture is uniform, the workability and the construction performance of the daub are good, the environmental temperature and the humidity are normal temperature as the ordinary cement daub, the engineering application range and the construction universality of the volcanic ash-based acid-resistant daub are expanded, and the construction difficulty and the environmental harshness of the acid-resistant daub are greatly reduced.
The actually measured 7d compressive strength of the volcanic ash-based acid-resistant daub is 43.1MPa, and the 14d compressive strength is as follows: 52.4 MPa; the 14d flexural strength is: 5.9 MPa; the tensile strength is 3.5MPa and is far greater than the standard requirement of GB50212-2014 construction Specification for anti-corrosion engineering of construction.
The volcanic ash-based acid-resistant daub is detected by Shaanxi iron shoulder electric power construction engineering quality detection Limited company, and the pickling stability is qualified, and other performance indexes all meet the quality requirements of compact acid-resistant daub in GB50212-2014 construction Specifications for building anti-corrosion engineering.
The volcanic ash-based acid-resistant daub is detected by Shaanxi iron shoulder electric power construction engineering quality detection Limited company and Shaanxi building material scientific research institute, and all performance indexes detected are obviously superior to the quality requirements of compact acid-resistant daub in GB50212-2014 construction Specification for building anti-corrosion engineering. Meanwhile, the volcanic ash-based acid-resistant daub meets the production quality control standard: the quality requirement of compact acid-resistant daub in GB50212-2014 construction Specification for building anticorrosion engineering.
Example one
The pozzolan-based acid-resistant mortar provided in this example includes the following raw materials, cement (PO42.5), in parts by weight: 15.3 parts of ultrafine fly ash: 61.4 parts, water: 20.2 parts of an excitant (water glass): 0.8 part, potassium silicate: 2.3 parts.
The preparation method of the pozzolan-based acid-resistant daub of the embodiment comprises the following steps:
step one, weighing the following raw materials in parts by weight;
15.3 portions of cement (PO42.5), 61.4 portions of ultrafine fly ash and water (H)220.2 portions of O), 0.8 portion of excitant and potassium silicate (K)2SiO3)2.3 parts of a mixture;
pouring the weighed cement, the ultrafine fly ash and the exciting agent into a stirrer to be uniformly stirred;
pouring the weighed water into a stirrer, and stirring for 2min at a constant speed to be fully stirred uniformly;
step four, finally weighing the potassium silicate (K)2SiO3) Adding the mixture into a stirrer, stirring the mixture for 1min at a constant speed, and fully stirring the mixture uniformly, wherein the immersion degree is controlled to be 40-60 mm, thus obtaining the volcanic ash-based acid-resistant daub.
The construction environment temperature of the embodiment is preferably 5-35 ℃, and the acid-resistant daub after construction should be subjected to moisturizing self-curing in time and is strictly forbidden to be subjected to watering curing.
Example two
The pozzolan-based acid-resistant mortar provided in this example includes the following raw materials, cement (PO42.5), in parts by weight: 13.1 parts, ultrafine fly ash: 64.2 parts, water: 18.2 parts of activator (water glass): 0.62 part, potassium silicate: 1.79 parts.
The preparation method of the pozzolan-based acid-resistant daub of the embodiment comprises the following steps:
step one, weighing the following raw materials in parts by weight;
cement (PO 42.5): 13.1 parts, ultrafine fly ash: 64.2 parts, water: 18.2 parts of activator (water glass): 0.62 part, potassium silicate: 1.79 parts;
pouring the weighed cement, the ultrafine fly ash and the exciting agent into a stirrer to be uniformly stirred;
pouring the weighed water into a stirrer, and stirring for 4min at a constant speed to be fully stirred uniformly;
step four, finally weighing the potassium silicate (K)2SiO3) Adding the mixture into a stirrer, stirring the mixture for 1min at a constant speed, and fully stirring the mixture uniformly, wherein the immersion degree is controlled to be 40-60 mm, thus obtaining the volcanic ash-based acid-resistant daub.
The construction environment temperature of the embodiment is preferably 5-35 ℃, and the acid-resistant daub after construction should be subjected to moisturizing self-curing in time and is strictly forbidden to be subjected to watering curing.
EXAMPLE III
The pozzolan-based acid-resistant mortar provided in this example includes the following raw materials, cement (PO42.5), in parts by weight: 17.8 parts of ultrafine fly ash: 58.2 parts, water: 23.7 parts of activator (water glass): 0.99 part, potassium silicate: 2.68 parts.
The preparation method of the pozzolan-based acid-resistant daub of the embodiment comprises the following steps:
step one, weighing the following raw materials in parts by weight;
cement (PO 42.5): 17.8 parts of ultrafine fly ash: 58.2 parts, water: 23.7 parts of activator (water glass): 0.99 part, potassium silicate: 2.68 parts;
pouring the weighed cement, the ultrafine fly ash and the exciting agent into a stirrer to be uniformly stirred;
pouring the weighed water into a stirrer, and stirring for 3min at a constant speed to be fully and uniformly stirred;
step four, finally weighing the potassium silicate (K)2SiO3) Adding the mixture into a stirrer, stirring the mixture for 1min at a constant speed, and fully stirring the mixture uniformly, wherein the immersion degree is controlled to be 40-60 mm, thus obtaining the volcanic ash-based acid-resistant daub.
The construction environment temperature of the embodiment is preferably 5-35 ℃, and the acid-resistant daub after construction should be subjected to moisturizing self-curing in time and is strictly forbidden to be subjected to watering curing.
Example four
The pozzolan-based acid-resistant mortar provided in this example includes the following raw materials, cement (PO42.5), in parts by weight: 16.6 parts of ultrafine fly ash: 60.2 parts, water: 22.5 parts of activator (water glass): 0.89 part, potassium silicate: 2.52 parts.
The preparation method of the pozzolan-based acid-resistant daub of the embodiment comprises the following steps:
step one, weighing the following raw materials in parts by weight;
cement (PO 42.5): 16.6 parts of ultrafine fly ash: 60.2 parts, water: 22.5 parts of activator (water glass): 0.89 part, potassium silicate: 2.52 parts;
pouring the weighed cement, the ultrafine fly ash and the exciting agent into a stirrer to be uniformly stirred;
pouring the weighed water into a stirrer, and stirring for 2min at a constant speed to be fully stirred uniformly;
step four, finally weighing the potassium silicate (K)2SiO3) Adding the mixture into a stirrer, stirring the mixture for 1min at a constant speed, and fully stirring the mixture uniformly, wherein the immersion degree is controlled to be 40-60 mm, thus obtaining the volcanic ash-based acid-resistant daub.
The construction environment temperature of the embodiment is preferably 5-35 ℃, and the acid-resistant daub after construction should be subjected to moisturizing self-curing in time and is strictly forbidden to be subjected to watering curing.
Claims (9)
1. The preparation method of the volcanic ash-based acid-resistant daub is characterized by comprising the following steps of:
step one, weighing the raw materials in parts by weight;
cement: 13-18 parts; fly ash: 58-65 parts of a binder; water: 18-24 parts of a solvent; exciting agent: 0.6-1 part; potassium silicate: 1.8-2.7 parts;
step two, stirring the cement, the fly ash and the excitant weighed in the step one to form a material A;
step three, stirring the water weighed in the step one and the material A to obtain a material B;
and step four, stirring the potassium silicate weighed in the step one and the material B to obtain the volcanic ash-based acid-resistant daub.
2. The method for preparing the pozzolan-based acid-resistant daub according to claim 1, wherein in the first step, the raw materials are weighed according to the following parts by weight: cement: 15.3 parts of fly ash: 61.4 parts, water: 20.2 parts of an exciting agent: 0.8 part, potassium silicate: 2.3 parts.
3. The method for preparing the pozzolan-based acid-resistant mastic as claimed in claim 1 or 2, wherein: in the first step to the fourth step, the ambient temperature is 5 ℃ to 35 ℃.
4. The method of preparing the pozzolan-based acid-resistant mastic of claim 3, wherein: in the first step, the excitant is water glass.
5. The method for preparing the pozzolan-based acid-resistant mastic of claim 4, wherein: in the first step, the fly ash is ultrafine fly ash, the fineness of the fly ash is equal to or less than 0.5 percent of screen residue of a 45-micron sieve, the water requirement ratio is 100 percent, and the loss on ignition is 2.8 percent.
6. The volcanic ash-based acid-resistant daub is characterized by comprising the following raw materials in parts by weight: 13-18 parts; fly ash: 58-65 parts of a binder; water: 18-24 parts of a solvent; exciting agent: 0.6-1 part; potassium silicate: 1.8 to 2.7 portions.
7. The pozzolan-based, acid-resistant mastic of claim 6, wherein: the cement comprises the following raw materials in parts by weight: 15.3 parts of fly ash: 61.4 parts, water: 20.2 parts of an exciting agent: 0.8 part, potassium silicate: 2.3 parts.
8. The pozzolan-based, acid-resistant mastic of claim 6 or claim 7, wherein: the excitant is water glass.
9. The pozzolan-based, acid-resistant mastic of claim 8, wherein: the fly ash is ultrafine fly ash, the fineness of the fly ash is that the screen residue of a 45-micron sieve is less than or equal to 0.5 percent, the water requirement ratio is 100 percent, and the loss on ignition is 2.8 percent.
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| WO2011135584A2 (en) * | 2010-04-29 | 2011-11-03 | Aditya Birla Science And Technology Company Limited | Geopolymer concrete |
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