CN115259790A - Light high-strength mortar based on clay calcined by limestone powder and preparation method thereof - Google Patents
Light high-strength mortar based on clay calcined by limestone powder and preparation method thereof Download PDFInfo
- Publication number
- CN115259790A CN115259790A CN202210867131.4A CN202210867131A CN115259790A CN 115259790 A CN115259790 A CN 115259790A CN 202210867131 A CN202210867131 A CN 202210867131A CN 115259790 A CN115259790 A CN 115259790A
- Authority
- CN
- China
- Prior art keywords
- limestone powder
- strength
- mortar
- strength mortar
- cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/106—Kaolin
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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
-
- 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
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2053—Earthquake- or hurricane-resistant materials
-
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses light high-strength mortar based on clay calcined by limestone powder and a preparation method thereof, and relates to the technical field of building materials. The raw materials for preparing the limestone powder calcined clay-based light high-strength mortar of the invention and the mass ratio of the raw materials are as follows: the mass ratio of cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent is as follows: 1 to (0.29 to 0.55) to (0.1 to 0.14) to (1.42 to 2.00) to (0.57 to 0.81) to (0.02 to 0.04). The light high-strength mortar based on clay calcined by limestone powder has low density, excellent specific strength, mechanical property and durabilityMeanwhile, the consumption of cement and natural river sand is reduced, and the resource saving and reutilization are promoted. The light high-strength mortar based on clay calcined by limestone powder solves the problems of low strength, poor durability, high density, low specific strength, poor thermal conductivity and the like of cement mortar in the prior art, the strength of the mortar can reach more than LC50, and the density of the mortar can be as low as 1354.3kg/m3And has good durability and heat conductivity.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to lightweight high-strength mortar based on clay calcined by limestone powder and a preparation method thereof.
Background
With the development of society and the progress of science and technology, the development of construction industry is accelerated year by year. In the construction process of the building engineering, a novel material is required to be actively used, the application advantages of the material are exerted, the quality of the building engineering is guaranteed, the requirements of environmental protection and energy conservation are met, and the performance of the building is fundamentally improved.
The development of concrete as a traditional building material has been over 100 years, and the development of concrete gradually moves to the direction of high durability, high workability and high volume stability along with the requirements of modern building structures and use environments. The high performance and multi-functionalization requirements of the structural material lead the structural material to be developed towards light weight, high strength and energy saving, the light weight and high strength material is researched vigorously, the specific strength (the ratio of compressive strength to volume density) of the structural material is improved, the self weight of the member is reduced, the section size of the bearing structure is reduced, and the development trend of the concrete material is formed.
Compared with the concrete in the prior art, the light high-strength mortar is reduced by 20-40%, and the strength can reach the strength grade C30-C50 used for common concrete. The reduction of the dead weight reduces the pressure of the structure on the foundation, which creates conditions for the high-rise and large-span of the structure. The heat conductivity coefficient of the ceramic sand concrete is generally lower than that of common concrete by more than half, so that the wall thickness can be reduced, the living area is correspondingly increased, and the heat insulation performance of a room can be greatly improved under the condition of the same wall thickness. The ceramic sand concrete has light dead weight, low elastic modulus and high allowable change performance, so that the anti-seismic performance is high. The pottery sand has a rough surface compared with the broken stone and certain water absorption capacityThe ceramic sand can absorb excessive moisture after the ceramic sand concrete is formed, the moisture of the concrete gradually evaporates along with the time, the ceramic sand can slowly release the internal moisture, so that the set cement is sufficiently maintained, the compactness and the strength of the set cement are improved, the pore structure of the set cement is improved, the impermeability is further improved, the harmful medium invasion resistance of the ceramic sand concrete is relatively strong, the alkali impermeability reaction problem of the concrete can be effectively avoided by using the ceramic sand, the service life of a building is prolonged, and the ceramic sand concrete has high impermeability and durability. However, the existing mortar still has the problems of low strength, poor durability, high density, low specific strength, poor thermal conductivity and the like. The light high-strength mortar with clay base calcined by limestone powder solves the problems of low strength, poor durability, high density, low specific strength, poor thermal conductivity and the like of the cement mortar in the prior art, the strength of the light high-strength mortar can reach more than LC50, and the density of the light high-strength mortar can be as low as 1354.3kg/m3And has good durability and heat conductivity.
Disclosure of Invention
In view of the above, the invention aims to provide a light high-strength mortar with clay base calcined by limestone powder, which is used for structural stratification, crotch stratification, hydraulic engineering, ocean engineering, high-cold and hot areas, soft land base areas, earthquake multi-occurrence areas, alkali-aggregate reaction multi-occurrence areas, building engineering of areas eroded by chemical media, and reinforcement, repair and new construction of some buildings damaged by corrosion; the wall body is used for reducing the thickness of the wall body, increasing the living area and simultaneously improving the heat preservation and heat insulation performance of the room; the method is used for the repair reinforcement and technical reconstruction of some old bridges and old bridge reinforcement and bridge deck pavement engineering with reduced bearing capacity.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the limestone powder calcined clay-based light high-strength mortar is prepared from the following raw materials in percentage by mass: the mass ratio of cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent is as follows: 1: 0.29-0.55: 0.1-0.14: 1.42-2.00: 0.57-0.81: 0.02-0.04.
Optionally, the apparent density of the ceramic sand is 1720kg/m3The loose bulk density is 700.5kg/m3The void ratio was 59.27%, the saturated water absorption was 5.3%, and the crush value was 60.7%.
Optionally, the loss on ignition of the metakaolin is less than or equal to 5%, the content of silicon oxide is 40-60%, and the content of aluminum oxide is 30-50%.
Optionally, the metakaolin is coal-based calcined metakaolin.
Optionally, the solid content of the polycarboxylate superplasticizer is 15-25%, and the water reduction rate is 5-10%
Optionally, the cement is p.o52.5 grade portland cement.
Optionally, the limestone powder is powder with a particle size of 75 μm or less generated in stone processing.
Optionally, the limestone powder is mainly calcareous stone powder, and has a loss on ignition of not more than 5%, a calcium oxide content of 40-60%, a silicon oxide content of 20-40%, and an aluminum oxide content of not more than 10%.
The second purpose of the invention is to provide a method for preparing the lightweight high-strength mortar based on the clay calcined by limestone powder, which comprises the following steps:
1) Uniformly mixing the cement, the metakaolin and the limestone powder to obtain a mixture A;
2) Uniformly mixing the polycarboxylic acid water reducing agent with the water to obtain a mixed solution B;
3) And mixing the mixture A and the mixed solution B, stirring for 120-240 seconds, adding the ceramsite, stirring for 120-240 seconds, forming, standing, demolding and maintaining to obtain the limestone powder calcined clay-based light high-strength mortar.
Optionally, the standing time of the standing is 12-36h; the curing temperature is 18-24 ℃, the curing relative humidity is not less than 95%, and the curing time is 28-30d.
Compared with the prior art, the limestone powder calcined clay-based light high-strength mortar has the following advantages:
1. the metakaolin in the light high-strength mortar with the clay calcined by the limestone powder has the advantages that the hydration degree of the mortar cement is improved, the hydration product is optimized, the secondary hydration reaction is carried out with the calcium hydroxide of the cement hydration product, the microcrystalline nucleation effect and the pozzolanic activity of siliceous and calcareous particles with the particle size of less than 0.045mm in the limestone powder are reacted with the cement hydration product, the cement hydration is promoted, the content of the calcium hydroxide in the hydration product can be reduced, the compactness of a mortar test piece is improved, the porosity is reduced, the mechanical property, the durability and the like of the cement mortar test piece are improved, the synergy can be generated between the limestone powder and the metakaolin, the microstructure of the mortar is obviously changed, the porosity of the mortar is reduced, the pore structure of the mortar is improved, and the compactness of the mortar is increased.
2. The pore structure of the ceramic sand in the limestone powder calcined clay-based light high-strength mortar causes a 'micropump' effect, after the ceramic sand concrete is molded, the ceramic sand can absorb excessive moisture, the moisture of the concrete gradually evaporates along with the time, and the ceramic sand can slowly release the internal moisture, so that the cement stone is sufficiently maintained, the compactness and the strength of the cement stone are improved, the pore structure of the cement stone is also improved, the impermeability is further improved, the harmful medium invasion resistance of the ceramic sand concrete is relatively strong, in addition, the alkali-aggregate reaction problem of the concrete can be effectively avoided by using the ceramic sand, the service life of a building is prolonged, and the limestone powder calcined clay-based light high-strength mortar has higher impermeability and durability.
3. The limestone powder calcined clay-based light high-strength mortar provided by the invention has the characteristic of being reduced by 20-40% compared with the concrete in the prior art, and the strength can be more than LC 50; the heat conductivity coefficient is generally lower than that of common concrete by more than half; the self weight is light, the elastic modulus is low, the allowable change performance is high, and the anti-seismic performance is good; the anti-harmful medium invasion ability is also relatively strong, and the use of the ceramic sand can effectively avoid the alkali aggregate reaction problem, and the like, and can be better applied to engineering construction. By selecting a reasonable mixing proportion, the problems of Tao Shatong and mortar (low strength, poor durability, high density, low specific strength, poor heat conductivity and the like) in the prior art can be solved, and the mortar can be used for structure highrise, crotch enlargement, hydraulic engineering, ocean engineering, high-cold and hot areas, soft land base areas, earthquake multi-occurrence areas, alkali-aggregate reaction multi-occurrence areas, building engineering of areas eroded by chemical media and reinforcement, repair and new construction of buildings damaged by corrosion; the wall can be used for reducing the thickness of the wall, increasing the living area and simultaneously improving the heat preservation and heat insulation performance of the room; the method can be used for the repair, reinforcement and technical reconstruction of some old bridges, and the reinforcement and bridge deck pavement engineering of old bridges with reduced bearing capacity.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to examples.
The raw materials used in the following examples are specifically:
the ceramic sand has a particle size of 0.075 mm-4.75 mm and an apparent density of 1720kg/m3The loose bulk density is 700.5kg/m3The void ratio is 59.27%, the saturated water absorption is 5.3%, and the crushing value is 60.7%;
the loss on ignition of metakaolin is 3.47%, the content of silicon oxide is 55.06%, the content of aluminum oxide is 44.12%, and the metakaolin is coal-series calcined metakaolin;
the solid content of the polycarboxylate superplasticizer is 18 percent, and the water reducing rate is 8 percent;
the cement is P.O52.5 grade ordinary portland cement;
the limestone powder is powder with the grain diameter below 75 mu m generated in stone processing, mainly is calcareous limestone powder, and has the loss on ignition of 2.56 percent, the calcium oxide content of 51.32 percent, the silicon oxide content of 26.03 percent and the aluminum oxide content of 6.73 percent.
Example 1
The limestone powder calcined clay-based light high-strength mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent = 1: 0.29: 0.14: 1.57: 0.57: 0.02.
Example 2
The limestone powder calcined clay-based light high-strength mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent are = 1: 0.29: 0.14: 1.71: 0.57: 0.02.
Example 3
The limestone powder calcined clay-based light high-strength mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent are = 1: 0.29: 0.14: 1.57: 0.81: 0.02.
Example 4
The limestone powder calcined clay-based light high-strength mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent = 1: 0.54: 0.27: 1.57: 0.57: 0.02.
Example 5
The limestone powder calcined clay-based light high-strength mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent are = 1: 0.54: 0.27: 1.71: 0.57: 0.02.
Example 6
The limestone powder calcined clay-based light high-strength mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent = 1: 0.54: 0.27: 1.57: 0.81: 0.02.
The limestone powder calcined clay-based light high-strength mortar of embodiments 1 to 6 of the invention is prepared by the following method:
1) Uniformly mixing cement, metakaolin and limestone powder according to the proportion of the raw materials to obtain a mixture A;
2) Uniformly mixing a polycarboxylic acid water reducing agent and water according to the raw material proportion to obtain a mixed solution B;
3) And mixing the mixture A and the mixed solution B, stirring for 120-240 seconds, adding ceramic sand, stirring for 120-240 seconds, vibrating for molding, standing for 24 hours in a room, demolding, and curing for 28 days in a standard curing room with the temperature of (20 +/-2) DEG C and the relative humidity of more than 95% to obtain the limestone powder calcined clay-based light high-strength mortar.
Comparative example 1
The cement mortar is prepared from the following raw materials in percentage by mass: cement, natural fine aggregate and polycarboxylic acid water reducing agent = 1: 3: 0.02, and the water-glue ratio is 0.40.
The cement mortar is prepared by the following method:
1) Uniformly mixing a polycarboxylate superplasticizer and water according to the raw material proportion to obtain a mixed solution A;
2) Pouring the mixed solution A and cement into a stirring pot according to the proportion of the raw materials, fully stirring for 120-240 seconds, adding natural fine aggregate, stirring for 120-240 seconds, vibrating for forming, standing for 24 hours in a room, demoulding, and curing for 28 days in a standard curing room with the temperature of (20 +/-2) DEG C and the relative humidity of more than 95 percent to obtain the cement mortar.
Comparative example 2
The cement mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, limestone powder, natural fine aggregate, water and polycarboxylic acid water reducing agent = 1: 0.29: 0.14: 4.28: 0.57: 0.02. The water-to-glue ratio was 0.40.
The cement mortar is prepared by the following method:
1) Uniformly mixing cement, metakaolin and limestone powder according to the raw material proportion to obtain a mixture A;
2) Uniformly mixing a polycarboxylate superplasticizer and water according to the raw material proportion to obtain a mixed solution B;
3) And (3) mixing the mixture A and the mixed solution B, stirring for 120-240 seconds, adding natural fine aggregate, stirring for 120-240 seconds, vibrating for molding, standing for 24 hours indoors, demolding, and curing for 28 days in a standard curing room with the temperature of (20 +/-2) DEG C and the relative humidity of more than 95% to obtain the cement mortar.
Comparative example 3
The cement mortar is prepared from the following raw materials in percentage by mass: cement, metakaolin, natural fine aggregate, water and polycarboxylic acid water reducing agent are = 1: 0.25: 3.75: 0.50: 0.02. The water-to-glue ratio was 0.40.
The cement mortar is prepared by the following method:
1) Uniformly mixing cement and metakaolin according to the proportion of the raw materials to obtain a mixture A;
2) Uniformly mixing a polycarboxylic acid water reducing agent and water according to the raw material proportion to obtain a mixed solution B;
3) And (3) mixing the mixture A and the mixed solution B, stirring for 120-240 seconds, adding natural fine aggregate, stirring for 120-240 seconds, vibrating for molding, standing for 24 hours indoors, demolding, and curing for 28 days in a standard curing room with the temperature of (20 +/-2) DEG C and the relative humidity of more than 95% to obtain the cement mortar.
Comparative example 4
The cement mortar is prepared from the following raw materials in percentage by mass: cement, limestone powder, natural fine aggregate, water and polycarboxylic acid water reducing agent = 1: 0.11: 3.33: 0.44: 0.02. The water-to-glue ratio was 0.40.
The cement mortar is prepared by the following method:
1) Uniformly mixing cement and limestone powder according to the raw material proportion to obtain a mixture A;
2) Uniformly mixing a polycarboxylate superplasticizer and water according to the raw material proportion to obtain a mixed solution B;
3) And mixing the mixture A and the mixed solution B, stirring for 120-240 seconds, adding the natural fine aggregate, stirring for 120-240 seconds, vibrating for forming, standing for 24 hours in a room, demolding, and curing for 28 days in a standard curing room with the temperature of (20 +/-2) DEG C and the relative humidity of more than 95% to obtain the cement mortar.
The performance of the limestone powder calcined clay-based lightweight, high-strength mortar of examples 1-6 of the present invention and the cement mortar of the comparative example were tested, and the test results are shown in table 1.
TABLE 1
As can be seen from Table 1, the ordinary cement mortar has high density, low specific strength, high electric flux, non-compact structure, poor durability and poor thermal conductivity without adding metakaolin and limestone powder or replacing natural fine aggregates. As can be seen from comparative examples 2, 3 and 4, the limestone powder and the metakaolin have a synergistic effect, so that the microstructure of the mortar is obviously changed, the porosity of the mortar is reduced, the pore structure of the mortar is improved, and the compactness of the mortar is increased. In the embodiments 1-6 of the invention, after a certain amount of metakaolin and limestone powder are added and the natural fine aggregate is completely replaced by the ceramic sand, the obtained lightweight high-strength mortar based on clay calcined by the limestone powder has moderate compressive strength, obviously reduced density, increased specific strength, obviously reduced electric flux and obviously reduced heat conductivity coefficient. The main reasons are as follows: according to the cement mortar sample preparation method, the metakaolin is subjected to a secondary hydration reaction with the cement hydration product calcium hydroxide by improving the hydration degree of the cement in the mortar, optimizing the hydration product, and promoting the cement hydration through the micro nucleation effect and the pozzolan activity of the limestone powder to react with the cement hydration product, so that the calcium hydroxide content in the hydration product can be reduced, the compactness of the mortar sample is improved, the porosity is reduced, and the compactness of the cement mortar sample is improved. The limestone powder and the metakaolin can generate a synergistic effect, the microstructure of the mortar can be obviously changed, the porosity of the mortar is reduced, the pore structure of the mortar is improved, and the compactness of the mortar is increased. The pottery sand has low density, more pores, low strength and strong water absorption, and replaces natural fine aggregate with the pottery sand, thereby greatly reducing the density of the cement mortar. Meanwhile, the pore structure of the ceramic sand causes a 'micropump' effect, after the limestone powder calcined clay-based light high-strength mortar is molded, the ceramic sand can absorb excessive moisture, the moisture in the mortar gradually evaporates along with the prolonging of time, the ceramic sand can slowly release the internal moisture, and the cement stone is sufficiently maintained, so that the interface transition region of a mortar test piece can be compacted, the effect also improves the pore structure of the cement stone and further improves the impermeability, so that the capability of resisting the invasion of harmful media of the limestone powder calcined clay-based light high-strength mortar is relatively strong, the alkali aggregate reaction problem can be effectively avoided by using the ceramic sand, the service life of a building is prolonged, and the limestone powder calcined clay-based light high-strength mortar has higher impermeability and durability.
According to the light high-strength mortar based on clay calcined by limestone powder, the use amount of cement can be reduced, the carbon emission is reduced, the problem of environmental pollution caused by large-amount accumulation of the limestone powder can be solved, the use amount of natural river sand can be reduced by 100% substitution rate of ceramic sand, and the resource recycling is promoted. Meanwhile, compared with the concrete in the prior art, the weight is reduced by 20-40%, and the strength can reach more than LC 50; the heat conductivity coefficient is generally lower than that of common concrete by more than half; the self weight is light, the elastic modulus is low, the allowable change performance is high, and the anti-seismic performance is good; the capability of resisting the invasion of harmful media is relatively strong, and in addition, the reaction problem of alkali aggregate can be effectively avoided by using the ceramic sand. By selecting a reasonable mixing proportion, the mortar problems (low strength, poor durability, high density, low specific strength, poor thermal conductivity and the like) in the prior art can be improved, and the mortar can be used for structural stratification, crotch stratification, hydraulic engineering, ocean engineering, high-cold and hot areas, soft land base areas, earthquake multi-generation areas, alkali-aggregate reaction multi-generation areas, building engineering of areas eroded by chemical media and reinforcement, repair and new construction of buildings damaged by corrosion; the wall can be used for reducing the thickness of the wall, increasing the living area and simultaneously improving the heat preservation and heat insulation performance of the room; the method can be used for the repair, reinforcement and technical reconstruction of some old bridges and the reinforcement and bridge deck pavement engineering of old bridges with reduced bearing capacity.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The limestone powder calcined clay-based light high-strength mortar is characterized in that raw materials for preparing the limestone powder calcined clay-based light high-strength mortar are as follows by mass: the mass ratio of cement, metakaolin, limestone powder, ceramic sand, water and polycarboxylic acid water reducing agent is as follows: 1 to (0.29 to 0.55) to (0.1 to 0.14) to (1.42 to 2.00) to (0.57 to 0.81) to (0.02 to 0.04).
2. The limestone powder calcined clay-based light high-strength mortar according to claim 1, wherein the apparent density of the ceramic sand is 1720kg/m3The loose bulk density is 700.5kg/m3The void ratio was 59.27%, the saturated water absorption was 5.3%, and the crush value was 60.7%.
3. The limestone powder calcined clay-based light high-strength mortar according to claim 1, wherein the loss on ignition of metakaolin is not more than 5%, the content of silica is 40-60%, and the content of alumina is 30-50%.
4. The limestone powder calcined clay-based light high-strength mortar according to claim 1, wherein the metakaolin is coal-series calcined metakaolin.
5. The limestone powder calcined clay-based light-weight high-strength mortar according to claim 1, wherein the solid content of the polycarboxylate water reducer is 15-25%, and the water reduction rate is 5% -10%.
6. The limestone powder calcined clay-based light high-strength mortar according to claim 1, wherein the cement is P.O52.5-grade ordinary portland cement.
7. The limestone powder calcined clay-based light high-strength mortar according to claim 1, wherein the limestone powder is powder with a particle size of 75 μm or less generated in stone processing.
8. The limestone powder calcined clay-based light high-strength mortar according to claim 1, wherein the limestone powder is mainly calcium stone powder, and has a loss on ignition of not more than 5%, a calcium oxide content of 40-60%, a silicon oxide content of 20-40%, and an aluminum oxide content of not more than 10%.
9. Method for preparing a lightweight, high-strength mortar based on clay calcined with limestone powder according to any of claims 1 to 8, characterized in that it comprises the following steps:
1) Uniformly mixing the cement, the metakaolin and the limestone powder to obtain a mixture A;
2) Uniformly mixing the polycarboxylic acid water reducing agent with the water to obtain a mixed solution B;
3) And mixing the mixture A and the mixed solution B, stirring for 120-240 seconds, adding the ceramic sand, stirring for 120-240 seconds, forming, standing, demolding and maintaining to obtain the limestone powder calcined clay-based light high-strength mortar.
10. The method for preparing the lightweight high-strength mortar based on clay calcined by limestone powder according to claim 9, wherein the standing time is 12-36h; the curing temperature is 18-24 ℃, the curing relative humidity is more than or equal to 95%, and the curing time is 28-30d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210867131.4A CN115259790B (en) | 2022-07-22 | 2022-07-22 | Limestone powder calcined clay-based light high-strength mortar and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210867131.4A CN115259790B (en) | 2022-07-22 | 2022-07-22 | Limestone powder calcined clay-based light high-strength mortar and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115259790A true CN115259790A (en) | 2022-11-01 |
| CN115259790B CN115259790B (en) | 2023-07-18 |
Family
ID=83766498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210867131.4A Active CN115259790B (en) | 2022-07-22 | 2022-07-22 | Limestone powder calcined clay-based light high-strength mortar and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115259790B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327395A (en) * | 1999-05-25 | 2000-11-28 | Kajima Corp | Lightweight highly-flowable concrete |
| CN103553450A (en) * | 2013-09-29 | 2014-02-05 | 江苏名和集团有限公司 | Lightweight self-compacting concrete and preparation method thereof |
| KR101488147B1 (en) * | 2014-07-16 | 2015-01-29 | 주식회사에스피엠 | A composition of eco-friendly non-cement type binder by low-temperature calcination, mortar and concrete comprising the same |
| CN111995317A (en) * | 2020-09-09 | 2020-11-27 | 中建西部建设北方有限公司 | High-strength crack-resistant low-heat-conductivity ceramsite concrete and preparation method thereof |
| CN112266210A (en) * | 2020-10-23 | 2021-01-26 | 湖南工学院 | Light high-strength concrete and preparation method and application thereof |
| CN112960952A (en) * | 2021-03-01 | 2021-06-15 | 中冶建筑研究总院有限公司 | High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof |
| CN113501698A (en) * | 2021-08-18 | 2021-10-15 | 广州中创建筑科技有限公司 | Lightweight aggregate concrete |
| US20220106230A1 (en) * | 2020-10-01 | 2022-04-07 | Icon Technology, Inc. | 3d printable portland limestone clay-based mortar utilizing locally available materials |
-
2022
- 2022-07-22 CN CN202210867131.4A patent/CN115259790B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327395A (en) * | 1999-05-25 | 2000-11-28 | Kajima Corp | Lightweight highly-flowable concrete |
| CN103553450A (en) * | 2013-09-29 | 2014-02-05 | 江苏名和集团有限公司 | Lightweight self-compacting concrete and preparation method thereof |
| KR101488147B1 (en) * | 2014-07-16 | 2015-01-29 | 주식회사에스피엠 | A composition of eco-friendly non-cement type binder by low-temperature calcination, mortar and concrete comprising the same |
| CN111995317A (en) * | 2020-09-09 | 2020-11-27 | 中建西部建设北方有限公司 | High-strength crack-resistant low-heat-conductivity ceramsite concrete and preparation method thereof |
| US20220106230A1 (en) * | 2020-10-01 | 2022-04-07 | Icon Technology, Inc. | 3d printable portland limestone clay-based mortar utilizing locally available materials |
| CN112266210A (en) * | 2020-10-23 | 2021-01-26 | 湖南工学院 | Light high-strength concrete and preparation method and application thereof |
| CN112960952A (en) * | 2021-03-01 | 2021-06-15 | 中冶建筑研究总院有限公司 | High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof |
| CN113501698A (en) * | 2021-08-18 | 2021-10-15 | 广州中创建筑科技有限公司 | Lightweight aggregate concrete |
Non-Patent Citations (3)
| Title |
|---|
| ZHENZHEN J: "Pottery Sand as Fine Aggregate for Preparing Alkali-Activated Slag Mortar", ADVANCES IN MATERIALS SCIENCE AND ENGINEERING, pages 1 - 10 * |
| 吴静: "新型地聚合物基建筑材料的研究", 中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑, no. 2007, pages 038 - 407 * |
| 白志民,肖仪武: "低温煅烧高岭土火山灰活性对水泥石结构的影响", 硅酸盐学报, no. 07, pages 93 - 98 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115259790B (en) | 2023-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112341123B (en) | Seawater corrosion resistant ceramic tile adhesive and production method thereof | |
| CN110776334B (en) | Cement-based wallboard with large hollow rate and ultrahigh toughness and preparation method thereof | |
| EP1876153A1 (en) | Ultrahigh-strength fiber-reinforced cement composition, ultrahigh-strength fiber-reinforced mortar or concrete, and ultrahigh-strength cement admixture | |
| CN109942235B (en) | Normal-temperature curing geopolymer concrete with high strength and high anti-carbonization performance and preparation method thereof | |
| CN110304872B (en) | Nano modified cement-based underwater non-dispersible material and preparation method thereof | |
| CN107522449B (en) | Self-leveling low-shrinkage high-strength mortar | |
| CN109956720A (en) | A kind of light silencing gravity flowing levelling mortar and preparation method thereof | |
| Nas et al. | Mechanical, durability and microstructure properties of concrete containing natural zeolite | |
| CN110981372A (en) | High-performance heat-preservation plastering mortar prepared from industrial solid wastes and preparation method thereof | |
| CN114956681A (en) | High-temperature cured low-carbon high-strength geopolymer concrete material and preparation method thereof | |
| CN110981369A (en) | High-performance expansive prestressed concrete and preparation method thereof | |
| CN111439973B (en) | Cement-based grouting material and preparation method and application thereof | |
| CN109650771B (en) | Shrinkage-reducing anti-cracking reinforcing agent, C50 machine-made sand concrete and preparation method | |
| JP2009084092A (en) | Mortar-based restoring material | |
| CN113563023A (en) | Premixed mortar and application thereof | |
| CN112811870A (en) | Concrete wall material blended with iron tailings, fly ash and polystyrene and preparation method thereof | |
| CN113004055B (en) | Green high-thermal-resistance self-insulation building block and preparation method thereof | |
| CN115259790B (en) | Limestone powder calcined clay-based light high-strength mortar and preparation method thereof | |
| CN115490448B (en) | Method for reducing self-shrinkage of ultra-high-performance concrete, high-strength concrete and high-strength mortar | |
| CN115340329A (en) | Recycled fine aggregate-magnesium oxide base expanding agent ultrahigh-performance concrete and preparation method thereof | |
| KR101617722B1 (en) | Waterproofing Admixture Composition for Concrete | |
| CN110885204B (en) | Anti-cracking reinforcing material for long-life concrete product and preparation method and application thereof | |
| CN109400071B (en) | C40 heat-resistant concrete easy to pump and preparation method thereof | |
| CN111960793B (en) | Preparation method of water-resistant and anti-seismic gypsum-based self-leveling material | |
| Abiola et al. | DURABILITY PROPERTIES OF CONCRETE MADE WITH RECYCLED CONCRETE AGGREGATE AND METAKAOLIN AS CEMENT REPLACEMENT |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |