CN111995317A - High-strength crack-resistant low-heat-conductivity ceramsite concrete and preparation method thereof - Google Patents
High-strength crack-resistant low-heat-conductivity ceramsite concrete and preparation method thereof Download PDFInfo
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- CN111995317A CN111995317A CN202010937954.0A CN202010937954A CN111995317A CN 111995317 A CN111995317 A CN 111995317A CN 202010937954 A CN202010937954 A CN 202010937954A CN 111995317 A CN111995317 A CN 111995317A
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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
- C04B28/02—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
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
- 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
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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
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention discloses high-strength crack-resistant low-heat-conductivity ceramsite concrete and a preparation method thereof, and the technical scheme is characterized in that the high-strength crack-resistant low-heat-conductivity ceramsite concrete comprises the following raw materials, by weight, 400 parts of portland cement 328-doped materials, 728 parts of ceramsite 617-doped materials, 20-50 parts of silica fume, 60-100 parts of mineral powder, 30-70 parts of fly ash, 725 parts of natural river sand 507-doped materials, 150 parts of water 100-doped materials, and rutile type nano TiO-doped materials2 10-25 parts of redispersible latex powder, 50-150 parts of polypropylene fiber and 2-2.5 parts of water reducing agent, so that the effects of high strength, low heat conduction and good crack deformation resistance are achieved; the preparation method of the ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following steps: s1: mixing portland cement, fly ash, mineral powder, silica fume, redispersible latex powder and polypropylene fiber; s2: water, rutile type nano TiO2Mixing the water reducer and the water reducer; s3: mixing S2 and S1; s4: and (3) adding the ceramsite and the natural river sand into the S3 to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
Description
Technical Field
The invention relates to the field of building materials, in particular to high-strength crack-resistant low-heat-conductivity ceramsite concrete and a preparation method thereof.
Background
At present, the building industry gradually turns to novel buildings from the traditional buildings, the new-age buildings are more focused on the development of energy conservation, environmental protection, energy consumption reduction, high-strength and light-weight structures, the traditional common concrete materials have the defects of great weight, low breaking strength, large shrinkage deformation and the like, the requirements of materials required by modern engineering construction cannot be met, and the search for novel building materials with excellent performance is very urgent. Under the background, the lightweight aggregate concrete has the advantages of light dead weight, large structural span, cost saving, good heat insulation performance and the like, and has wide application prospect in the future novel building industry.
The lightweight aggregate concrete can be composed of various different types of lightweight aggregates, wherein the lightweight aggregate ceramsite concrete is widely used. Ceramsite concrete attracts people's extensive attention due to its excellent characteristics of light weight, high strength, energy conservation, waste utilization, heat preservation, good heat insulation effect and the like, and gradually becomes the main trend of application and development in the field of concrete. However, the ceramsite concrete still has many defects in practical production and application, mainly comprising: the ceramsite has large porosity and strong water absorption capacity, and the slump loss of the concrete mixture is accelerated with time; secondly, the density difference between the ceramsite and the cement mortar is large, so that the ceramsite and the cement mortar are easy to generate undesirable phenomena such as segregation, layering and the like in the mixing, transportation and pumping processes; the ceramsite particles have the characteristics of low strength and light weight and porosity, so that the ceramsite particles have good heat insulation performance when being used in a large amount in a cement base material, but the strength of the hardened ceramsite concrete can be weakened, the problems of low bending strength, low bending tensile strength and the like are caused, and the popularization and application of the ceramsite materials are limited to a certain extent.
The prior Chinese patent with the reference publication number of CN106565274A discloses fiber-reinforced ceramsite foam concrete and a preparation method thereof, wherein the fiber-reinforced ceramsite foam concrete is prepared by taking ordinary portland cement, ceramsite, fly ash, a foaming agent and an expanding agent as raw materials, preparing ceramsite foam concrete slurry according to a certain proper mixing ratio, adding a certain amount of polypropylene fiber to prepare fiber-reinforced ceramsite foam concrete slurry on the basis, then, molding and carrying out standard maintenance to obtain the fiber-reinforced ceramsite foam concrete slurry. The density of the ceramsite foam concrete prepared by the method is 700-1400 Kg/m3The thermal conductivity coefficient is between 0.176 and 0.242W/m.K, the requirements of light weight, heat preservation and heat insulation of materials in non-bearing structures can be met, and the material has good crack resistance and deformation capability. However, because a large amount of micro bubbles are introduced into the material, the compactness of the whole concrete structure is reduced, and the strength of the lightweight aggregate ceramsite is not very high, the 28-day strength of the ceramsite foam concrete is only about 5-6 MPa under the combined action of the lightweight aggregate ceramsite and the lightweight aggregate ceramsite, and the use of the ceramsite foam concrete in some load-bearing structures with higher strength requirements is greatly limited.
The prior Chinese patent with the reference publication number of CN109320148A discloses a high-strength heat-preservation-type structural ceramsite concrete. The material comprises two parts of mortar and pre-stacked graded ceramsite, wherein the mortar comprises the following components in parts by weight: sand: 300 to 500 parts by weight; mineral powder: 40-80 parts; fly ash: 110 to 180 parts; water reducing agent: 3.0 to 8.0; thickening agent: 1.0 to 2.0; cement: 130-180 parts; water: 75-170 parts of; the graded ceramsite is 650-800 parts by weight, and is formed by mixing large-particle-size ceramsite, medium-particle-size ceramsite and small-particle-size ceramsite, and then grouting mortar into the pre-accumulated graded ceramsite for coagulation and hardening. The heat conductivity coefficient of the material can reach below 0.2W/m.K, and the heat insulation performance of the material is further improved compared with single-grain-size graded ceramsite concrete. However, in the invention, the mortar is grouted into the graded ceramsite to form a hardened structure, so that the mortar is required to have larger fluidity, and the selected ceramsite is reasonably matched with particles with different particle sizes to form a compact and packed structure, so that the difficulty of raw material selection and matching ratio design is increased, and the preparation process is more complicated.
The prior Chinese patent with the reference publication number of CN108409247A discloses a high-strength and high-durability fiber ceramsite concrete. The material is prepared from the following components: the cement, the fly ash, the mineral powder, the ceramsite, the water, the river sand, the polypropylene fiber, the water reducing agent and the like are prepared according to a certain proportion and a specific process. As the material is doped with fiber and mineral admixture, the tested compressive strength is more than 41MP in 7 days, more than 50MP in 28 days, the chloride ion permeation resistance grade Q-II, the clear water freeze-thaw cycle is 200 times, and the freeze-thaw cycle under 3% sodium chloride salt solution is 175 times, so that the material can be suitable for building structures in severe cold areas in the north of China and can meet the requirements of high strength and high durability. However, the ceramsite in the product needs to be soaked for 1 hour, and is drained for 12 hours to reach a saturated surface dry state, so that although the workability of concrete mixtures can be improved, the strength of the ceramsite concrete can be influenced to a certain extent, in addition, the treatment process brings many difficulties to actual construction, on one hand, the construction process becomes complicated, and on the other hand, the construction efficiency can also be reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the high-strength crack-resistant low-heat-conductivity ceramsite concrete, and the high-strength crack-resistant low-heat-conductivity ceramsite concrete has the effects of high strength, low heat conductivity and good crack deformation resistance.
The technical purpose of the invention is realized by the following technical scheme:
the ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following raw materials, by weight, 400 parts of portland cement 328-containing materials, 728 parts of ceramsite 617-containing materials, 20-50 parts of silica fume, 60-100 parts of mineral powder, 30-70 parts of fly ash, 725 parts of natural river sand 507-containing materials, 150 parts of water 100-containing materials, and rutile type nano TiO2 10-25 parts of redispersible latex powder, 50-150 parts of polypropylene fiber and 2-2.5 parts of water reducing agent.
The invention is further provided with 378 parts of Portland cement 350-,Rutile type nano TiO2 15-20 parts of redispersible latex powder, 70-130 parts of polypropylene fiber and 2.1-2.4 parts of water reducing agent.
By adopting the technical scheme, cement mortar formed by cement, silica fume, mineral powder, fly ash and natural river sand can play a role in blocking a water absorption pore channel on the surface of the ceramsite, thereby reducing the water absorption rate of the ceramsite and preventing the segregation phenomenon in the transportation process, meanwhile, the redispersible latex powder is combined with water to form polymer emulsion, the polymer emulsion gradually forms a polymer film structure along with the hydration reaction and the evaporation of water, and the polymer film structure is adhered on the surface of the ceramsite to form a waterproof film, thereby reducing the water absorption rate of the ceramsite, improving the problem of large loss of the ceramsite concrete in time, simultaneously, after the polypropylene fiber is added, a grid structure is formed in the concrete, not only the overlapping and linking effects are played on the ceramsite particles, the layering segregation problem caused by the rising and floating of the ceramsite is effectively inhibited, and simultaneously, the formation of the grid structure can disperse the stress of the concrete, the anti-cracking performance of the concrete is improved, so that the strength of the concrete is improved.
Therefore, the redispersible latex powder and the polypropylene fiber are matched for use, so that the ceramsite is connected, the generated polymer film also has a certain rebound effect, the plasticity characteristic of concrete is improved, the toughness is increased, and the anti-cracking deformation capacity is also obviously improved, so that the material can be used for various projects such as outer walls and roof parts of bridges, high-rise buildings and energy-saving buildings.
The traditional method is to mix nano TiO2The coating component is commonly used for being sprayed on the surface of a material to reduce the heat conductivity of high-temperature radiation, but the surface coating is easy to age and fall off along with the prolonging of the service time, and the existing rutile type nano TiO2After being mixed with cement paste, the hardened cement base material can also effectively exert high-temperature heat-insulating property, the design of heat insulation by only depending on ceramsite is improved, and rutile type nano TiO2Compared with pure nano TiO2The material has high relative density and refractive index, good shielding effect on long-wave ultraviolet rays and medium-wave ultraviolet rays, low heat conduction effect and absorptionAfter receiving ultraviolet rays, the paint does not decompose or change color, and has stronger stability and durability.
The addition of the fly ash, the mineral powder and the silica fume is beneficial to ecological environment protection, and meanwhile, the addition of the fly ash, the mineral powder and the silica fume can improve the compactness of the concrete and improve the later strength of the concrete.
The invention is further set that the stacking density of the ceramsite is 1000kg/m3The grain diameter is 5-20mm, and the continuous gradation is realized.
By adopting the technical scheme, the bulk density of the ceramsite is 1000kg/m3The grain diameter is 5-20mm, and the compactness of the concrete can be increased and the heat preservation and heat insulation performance of the concrete can be effectively improved when the concrete is continuously graded.
The invention is further set that the cylinder pressure strength of the ceramsite is 15-20MPa, and the water absorption rate is less than 5%.
By adopting the technical scheme, the cylinder pressure strength is 15-20MPa, the water absorption is less than 5%, and the self strength of the ceramsite is higher, so that the strength of the concrete can be effectively improved.
The invention further provides that the silicon dioxide volume content in the silica fume is more than 90%.
By adopting the technical scheme, after the volume content of silicon dioxide in the silica fume is greater than 90%, the activity in the later stage of the silica fume is effectively improved, so that the silica fume can react with cement and natural river sand more sufficiently in the later stage, and the strength of concrete and the compactness of the concrete are improved.
The invention is further provided that the natural river sand has a bulk density of 1600kg/m3 and a particle size of 0.1-5 mm.
The invention is further configured such that the portland cement is 42.5 grade portland cement.
The invention also aims to provide a preparation method of the high-strength crack-resistant low-heat-conductivity ceramsite concrete, which comprises the following steps:
s1: uniformly mixing the silicate cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber in proportion to obtain a fiber-polymer composite dry mixture;
s2: mixing water and rutile type nano TiO2 crystals in proportion to prepare a crystal water mixture, adding a water reducing agent in proportion to prepare a suspension, and stirring to obtain a nano TiO2 dispersion liquid;
s3: mixing and uniformly stirring the nano TiO2 dispersion liquid and the fiber-polymer composite dry blend in the S1 to obtain nano modified fiber-polymer composite slurry;
s4: and (4) adding the ceramsite and the natural river sand in proportion into the step S3, and uniformly stirring to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
By adopting the technical scheme, the Portland cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber are mixed firstly, and then the nano TiO is mixed2When the dispersion is added, the nano TiO is facilitated2The modified fiber-polymer composite slurry is fully dispersed into cement slurry, and then ceramsite and natural river sand are added into the nano modified fiber-polymer composite slurry, so that the dispersion liquid is wrapped on the surface of the ceramsite, pores on the surface of the ceramsite are blocked, the water absorption rate is reduced, and meanwhile, the modified fiber-polymer composite slurry is beneficial to filling fly ash, mineral powder, silica fume and the like into the pores of the ceramsite, so that the weight of the ceramsite is increased, the segregation phenomenon is prevented, the strength of the ceramsite is improved, and the strength of concrete is indirectly improved.
The invention is further configured that, in the step S2, nanometer TiO is added2Mixing with water, stirring at a stirring speed of 250-350r/min, adding water reducing agent uniformly, and stirring for 3-6min to obtain nanometer TiO2And stirring the suspension for 15-25min at the speed of 1500-.
The invention is further configured that in the step S3, the fiber-polymer composite dry blend is added, then the nano TiO2 dispersion is added, and the mixture is stirred for 2-5min at the speed of 40-50 r/min.
In conclusion, the invention has the following beneficial effects:
1. cement mortar formed by cement, silica fume, mineral powder, fly ash and water can block water absorption pore channels on the surface of the ceramsite, so that the water absorption rate of the ceramsite is reduced, the segregation phenomenon of concrete in the transportation process is prevented, and meanwhile, the addition of the fly ash and the mineral powder can reduce the porosity of the concrete and improve the strength of the concrete; the redispersible latex powder is combined with water to form polymer emulsion, and the polymer emulsion forms a waterproof film on the surface of the ceramsite along with the evaporation of water, so that the water absorption of the ceramsite is further reduced, and the dry-wet cycle resistance and freeze-thaw cycle resistance of concrete are improved; the polypropylene fiber is added to form a three-dimensional grid structure in the concrete, so that the stress concentration at the tip of a microcrack can be eliminated, the crack expansion is prevented, and the crack resistance of the concrete is improved;
2. rutile type nano TiO2The addition of the composite material has good shielding effect on long-wave ultraviolet rays and medium-wave ultraviolet rays, achieves the effect of low heat conduction, and meanwhile, the rutile type nano TiO2The particle size of (a) is small, the number of surface atoms is rapidly increased, and the surface area and the surface energy are also sharply increased, and since adjacent atoms are lacked around the surface atoms of the nanoparticles, many unsaturated dangling bonds are formed, and the nanoparticles are in an unstable state and are easily bonded to other atoms, the rutile-type nano TiO2Calcium ions diffused to the surfaces of the nano particles are easily adsorbed, a physical adsorption effect is formed on the calcium ions, the concentration of the calcium ions in a liquid phase is reduced, the progress of a hydration reaction is accelerated, and the strength of concrete is improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following raw materials, by weight, 328 parts of portland cement, 617 parts of ceramsite, 20 parts of silica fume, 60 parts of mineral powder, 30 parts of fly ash, 507 parts of natural river sand, 100 parts of water and rutile type nano TiO2 10 parts of redispersible latex powder, 50 parts of polypropylene fiber and 2 parts of water reducing agent;
the Portland cement is 42.5-grade Portland cement;
the bulk density of the ceramsite is 1000kg/m3The grain size is 5-20mm, the continuous gradation is realized, the cylinder pressure strength is 15-20MPa, and the water absorption is less than 5 percent;
the volume content of silicon dioxide in the silica fume is more than 90 percent;
the mineral powder is S95 grade mineral powder;
the grade of the fly ash is II grade, and the activity index is 80%;
the natural river sand has the bulk density of 1600kg/m3 and the particle size of 0.1-5 mm;
the water reducing agent is a polycarboxylic acid water reducing agent;
a preparation method of ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following steps:
s1: pouring the silicate cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber into a concrete mixer in proportion in sequence, and stirring for 30s at the speed of 200r/min to obtain a fiber-polymer composite dry mixture;
s2: firstly, adding water and rutile type nano TiO2 in proportion into a stirring pot, starting the stirring pot, stirring at the stirring speed of 250r/min, simultaneously uniformly adding a polycarboxylic acid water reducing agent into the stirring pot, and continuously stirring for 3min to prepare nano TiO2Suspending the solution, and then adding nano TiO2Stirring the suspension in a suspension guide chart high-speed stirrer at the speed of 1500r/min for 15min to obtain the nano TiO2A dispersion liquid;
s3: firstly, pouring the fiber-polymer composite dry blend in S1 into a concrete mixer, and then adding the nano TiO2Pouring the dispersion liquid, and stirring at the speed of 40r/min for 2min to obtain uniformly mixed nano modified fiber-polymer composite slurry;
s4: and (4) adding the ceramsite and the natural river sand in proportion into the step S3, and stirring at the rotating speed of 40r/min for 3min to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
Example 2
The ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following raw materials, by weight, 350 parts of portland cement, 653 parts of ceramsite, 25 parts of silica fume, 70 parts of mineral powder, 40 parts of fly ash, 550 parts of natural river sand, 110 parts of water and rutile type nano TiO2 15 parts of redispersible latex powder, 70 parts of polypropylene fiber and 2.1 parts of water reducing agent;
the Portland cement is 42.5-grade Portland cement;
the bulk density of the ceramsite is 1000kg/m3The grain diameter is 5-20mm, the continuous gradation is realized, the cylinder pressure strength is 15MPa, and the water absorption is less than 5 percent;
the volume content of silicon dioxide in the silica fume is more than 90 percent;
the mineral powder is S95 grade mineral powder;
the grade of the fly ash is II grade, and the activity index is 80%;
the natural river sand has a bulk density of 1600kg/m3The grain diameter is 0.1-5 mm;
the water reducing agent is a polycarboxylic acid water reducing agent;
a preparation method of ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following steps:
s1: pouring the silicate cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber into a concrete mixer in proportion in sequence, and stirring for 30s at the speed of 200r/min to obtain a fiber-polymer composite dry mixture;
s2: firstly, adding water and rutile type nano TiO2 in proportion into a stirring pot, starting the stirring pot, stirring at the stirring speed of 250r/min, simultaneously uniformly adding a polycarboxylic acid water reducing agent into the stirring pot, and continuously stirring for 3min to prepare nano TiO2Suspending the solution, and then adding nano TiO2Stirring the suspension in a suspension guide chart high-speed stirrer at the speed of 1500r/min for 15min to obtain the nano TiO2A dispersion liquid;
s3: firstly, pouring the fiber-polymer composite dry blend in S1 into a concrete mixer, and then adding the nano TiO2Pouring the dispersion liquid, and stirring at the speed of 40r/min for 2min to obtain uniformly mixed nano modified fiber-polymer composite slurry;
s4: and (4) adding the ceramsite and the natural river sand in proportion into the step S3, and stirring at the rotating speed of 40r/min for 3min to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
Example 3
The ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following raw materials, by weight, 364 parts of Portland cement, 672 parts of ceramsite, 35 parts of silica fume and ore80 parts of powder, 50 parts of fly ash, 616 parts of natural river sand, 125 parts of water and rutile type nano TiO2 18 parts of redispersible latex powder 100 parts, polypropylene fiber 5 parts and water reducing agent 2.3 parts;
the Portland cement is 42.5-grade Portland cement;
the bulk density of the ceramsite is 1000kg/m3The grain diameter is 5-20mm, the continuous gradation is realized, the cylinder pressure strength is 18MPa, and the water absorption is less than 5 percent;
the volume content of silicon dioxide in the silica fume is more than 90 percent;
the mineral powder is S95 grade mineral powder;
the grade of the fly ash is II grade, and the activity index is 80%;
the natural river sand has the bulk density of 1600kg/m3 and the particle size of 0.1-5 mm;
the water reducing agent is a polycarboxylic acid water reducing agent;
a preparation method of ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following steps:
s1: pouring the silicate cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber into a concrete mixer in proportion in sequence, and stirring for 30s at the speed of 250r/min to obtain a fiber-polymer composite dry mixture;
s2: firstly, adding water and rutile type nano TiO2 in proportion into a stirring pot, starting the stirring pot, stirring at the stirring speed of 300r/min, simultaneously uniformly adding a polycarboxylic acid water reducing agent into the stirring pot, and continuously stirring for 4min to prepare nano TiO2Suspending the solution, and then adding nano TiO2Stirring the suspension in a suspension guide chart high-speed stirrer at a speed of 2000r/min for 20min to obtain the nano TiO2A dispersion liquid;
s3: firstly, pouring the fiber-polymer composite dry blend in S1 into a concrete mixer, and then adding the nano TiO2Pouring the dispersion liquid, and stirring at the speed of 45r/min for 4min to obtain uniformly mixed nano modified fiber-polymer composite slurry;
s4: and (4) adding the ceramsite and the natural river sand in proportion into the step S3, and stirring at the rotating speed of 45r/min for 4min to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
Example 4
The ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following raw materials, by weight, 378 parts of portland cement, 695 parts of ceramsite, 45 parts of silica fume, 90 parts of mineral powder, 60 parts of fly ash, 675 parts of natural river sand, 140 parts of water and rutile type nano TiO220 parts of redispersible latex powder 130 parts, polypropylene fiber 5.5 parts and water reducing agent 2.4 parts;
the Portland cement is 42.5-grade Portland cement;
the bulk density of the ceramsite is 1000kg/m3The grain size is 5-20mm, the continuous gradation is realized, the cylinder pressure strength is 15-20MPa, and the water absorption is less than 5 percent;
the volume content of silicon dioxide in the silica fume is more than 90 percent;
the mineral powder is S95 grade mineral powder;
the grade of the fly ash is II grade, and the activity index is 80%;
the natural river sand has the bulk density of 1600kg/m3 and the particle size of 0.1-5 mm;
the water reducing agent is a polycarboxylic acid water reducing agent;
a preparation method of ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following steps:
s1: pouring the silicate cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber into a concrete mixer in proportion in sequence, and stirring for 30s at the speed of 300r/min to obtain a fiber-polymer composite dry mixture;
s2: firstly, the water and rutile type nano TiO are proportioned2Adding into a stirring pot, starting the stirrer, stirring at a stirring speed of 350r/min, simultaneously uniformly adding polycarboxylic acid water reducing agent into the stirring pot, and continuously stirring for 6min to obtain the nano TiO2Suspending the solution, and then adding nano TiO2Stirring the suspension in a suspension guide chart high-speed stirrer at the speed of 2500r/min for 25min to obtain the nano TiO2A dispersion liquid;
s3: firstly, pouring the fiber-polymer composite dry blend in S1 into a concrete mixer, and then adding the nano TiO2The dispersion was poured in at a rate of 50r/minStirring for 5min to obtain uniformly mixed nano modified fiber-polymer composite slurry;
s4: and (4) adding the ceramsite and the natural river sand in proportion into the step S3, and stirring at the rotating speed of 50r/min for 5min to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
Example 5
The ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following raw materials, by weight, 400 parts of portland cement, 728 parts of ceramsite, 50 parts of silica fume, 100 parts of mineral powder, 70 parts of fly ash, 725 parts of natural river sand, 150 parts of water and rutile type nano TiO225 parts of redispersible latex powder 150 parts, 6 parts of polypropylene fiber and 2.5 parts of water reducing agent;
the Portland cement is 42.5-grade Portland cement;
the bulk density of the ceramsite is 1000kg/m3The grain diameter is 5-20mm, the continuous gradation is realized, the cylinder pressure strength is 20MPa, and the water absorption is less than 5 percent;
the volume content of silicon dioxide in the silica fume is more than 90 percent;
the mineral powder is S95 grade mineral powder;
the grade of the fly ash is II grade, and the activity index is 80%;
the natural river sand has the bulk density of 1600kg/m3 and the particle size of 0.1-5 mm;
the water reducing agent is a polycarboxylic acid water reducing agent;
a preparation method of ceramsite concrete with high strength, crack resistance and low heat conductivity comprises the following steps:
s1: pouring the silicate cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber into a concrete mixer in proportion in sequence, and stirring for 30s at the speed of 300r/min to obtain a fiber-polymer composite dry mixture;
s2: firstly, the water and rutile type nano TiO are proportioned2Adding into a stirring pot, starting the stirrer, stirring at a stirring speed of 350r/min, simultaneously uniformly adding polycarboxylic acid water reducing agent into the stirring pot, and continuously stirring for 6min to obtain the nano TiO2Suspending the solution, and then adding nano TiO2In a suspension guide high-speed stirrer at 2500r/minStirring for 25min to obtain the nano TiO2A dispersion liquid;
s3: firstly, pouring the fiber-polymer composite dry blend in S1 into a concrete mixer, and then adding the nano TiO2Pouring the dispersion liquid, and stirring at the speed of 50r/min for 5min to obtain uniformly mixed nano modified fiber-polymer composite slurry;
s4: and (4) adding the ceramsite and the natural river sand in proportion into the step S3, and stirring at the rotating speed of 50r/min for 5min to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
Comparative example 1
The ceramsite concrete with high strength, crack resistance and low heat conductivity is different from the ceramsite concrete in the embodiment 3 in that polypropylene fibers are not contained in the ceramsite concrete.
Performance detection
According to a crack resistance test method in GB/T50082-2009 Standard test method for Long-term Performance and durability of ordinary concrete, the crack resistance of the concrete in examples 1-5 and comparative example 1 is detected;
the heat conductivity of the concrete was measured in accordance with "measurement of thermal insulation material steady-state thermal resistance and related characteristics" (GB/T10294-2008) and "test method for water vapor permeability of building materials and products thereof" (GB/T17146-2015), and the results of the measurements are shown in Table 1.
Table 1 table of concrete test results
| Item | Coefficient of thermal conductivity (W/m.K) | Coefficient of heat storage (W/m)2.K） | Compressive strength/Mpa | Unit ofTotal area of cracking in area (mm)2/m2） |
| Example 1 | 0.413 | 8.96 | 52.1 | 43.8 |
| Example 2 | 0.385 | 8.21 | 54.6 | 38.2 |
| Example 3 | 0.362 | 7.64 | 55.9 | 32.7 |
| Example 4 | 0.376 | 7.92 | 58.2 | 48.1 |
| Example 5 | 0.393 | 8.44 | 58.7 | 52.7 |
| Comparative example 1 | 0.378 | 7.95 | 49.8 | 68.6 |
From table 1, it can be seen that:
in examples 1 to 5, the thermal conductivity, the thermal storage coefficient, and the total cracking area per unit area are decreased and then increased, and the compressive strength is increased and then decreased, and example 3 is a turning point of each property, which illustrates the interaction between the preparation method and the proportion in example 3, and can effectively improve the compressive strength, the low thermal conductivity, and the crack resistance of the ceramsite concrete;
compared with the embodiment 3, the comparative example 1 has the advantages that after the polypropylene fibers are lacked in the raw materials, the heat conductivity coefficient and the heat storage coefficient of the concrete are increased, the compressive strength is reduced, and the total cracking area in unit area is correspondingly increased, mainly because the connection performance between ceramsite particles is reduced after the polypropylene fibers are lacked in the raw materials, the ceramsite is easy to rise and float, so that the concrete is seriously separated, the anti-cracking performance is poor, the strength of the concrete is reduced, and after the polypropylene fibers are lacked in the concrete, the heat conductivity coefficient and the heat storage coefficient of the concrete are increased compared with the embodiment 3, which shows that the addition of the polypropylene fibers ensures that the ceramsite concrete has excellent low heat conductivity and the heat insulation performance of the ceramsite concrete is improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The high-strength crack-resistant low-heat-conductivity ceramsite concrete is characterized in that: the raw materials comprise, by weight, 400 parts of portland cement 328-400, 728 parts of ceramsite 617-728, 20-50 parts of silica fume, 60-100 parts of mineral powder, 30-70 parts of fly ash, 725 parts of natural river sand 507-150, 150 parts of water 100-150, and rutile type nano TiO2 10-25 parts of redispersible latex powder, 50-150 parts of polypropylene fiber and 2-2.5 parts of water reducing agent.
2. The ceramsite concrete with high strength, crack resistance and low thermal conductivity as claimed in claim 1, wherein the ceramsite concrete comprises: 350-378 parts of Portland cement, 653-695 parts of ceramsite, 25-45 parts of silica fume, 70-90 parts of mineral powder, 40-60 parts of fly ash, 550-675 parts of natural river sand, 140 parts of water, and 140 parts of rutile type nano TiO-2 15-20 parts of redispersible latex powder, 70-130 parts of polypropylene fiber and 2.1-2.4 parts of water reducing agent.
3. The ceramsite concrete with high strength, crack resistance and low thermal conductivity as claimed in claim 1, wherein the ceramsite concrete comprises: the bulk density of the ceramsite is 1000kg/m3The grain diameter is 5-20mm, and the continuous gradation is realized.
4. The ceramsite concrete with high strength, crack resistance and low thermal conductivity as claimed in claim 1, wherein the ceramsite concrete comprises: the cylinder pressure strength of the ceramsite is 15-20MPa, and the water absorption rate is less than 5%.
5. The ceramsite concrete with high strength, crack resistance and low thermal conductivity as claimed in claim 1, wherein the ceramsite concrete comprises: the volume content of silicon dioxide in the silica fume is more than 90 percent.
6. The ceramsite concrete with high strength, crack resistance and low thermal conductivity as claimed in claim 1, wherein the ceramsite concrete comprises: the natural river sand has the bulk density of 1600kg/m3 and the particle size of 0.1-5 mm.
7. The ceramsite concrete with high strength, crack resistance and low thermal conductivity as claimed in claim 1, wherein the ceramsite concrete comprises: the portland cement is 42.5-grade portland cement.
8. The preparation method of the ceramsite concrete with high strength, crack resistance and low thermal conductivity as defined in any one of claims 1-7, which is characterized by comprising the following steps:
s1: uniformly mixing the silicate cement, the fly ash, the mineral powder, the silica fume, the redispersible latex powder and the polypropylene fiber in proportion to obtain a fiber-polymer composite dry mixture;
s2: proportionally mixing water with rutile-type nano TiO2Mixing the crystals to prepare a crystal water mixture, adding a water reducing agent with a proportional amount to prepare a suspension, and stirring to obtain the nano TiO2A dispersion liquid;
s3: mixing nanometer TiO2Mixing the dispersion liquid with the fiber-polymer composite dry blend in the S1 and uniformly stirring to obtain nano modified fiber-polymer composite slurry;
s4: and (4) adding the ceramsite and the natural river sand in proportion into the step S3, and uniformly stirring to obtain the high-strength crack-resistant low-heat-conductivity ceramsite concrete.
9. The ceramsite concrete with high strength, crack resistance and low thermal conductivity and the preparation method thereof according to claim 8, is characterized in that: in the step S2, rutile type nano TiO is added2Mixing with water, stirring at a stirring speed of 250-350r/min, adding water reducing agent uniformly, and stirring for 3-6min to obtain nanometer TiO2The suspension is stirred for 15-25min at the speed of 1500-2And (3) dispersing the mixture.
10. The ceramsite concrete with high strength, crack resistance and low thermal conductivity and the preparation method thereof according to claim 8, is characterized in that: in the step S3, the fiber-polymer composite dry mixture is added firstly, and then the nano TiO is added2Stirring the dispersion liquid at a speed of 40-50r/min for 2-5 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114044693A (en) * | 2021-12-02 | 2022-02-15 | 陕西汇丰高性能粉体材料有限公司 | Ceramsite concrete and preparation method thereof |
| CN115259790A (en) * | 2022-07-22 | 2022-11-01 | 武汉工程大学 | Light high-strength mortar based on clay calcined by limestone powder and preparation method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747006A (en) * | 2009-12-28 | 2010-06-23 | 宁波大学 | High-performance lightweight aggregate concrete |
| CN104986996A (en) * | 2015-06-25 | 2015-10-21 | 中铁第四勘察设计院集团有限公司 | Composite fiber macromolecular reinforced concrete sound barrier and manufacturing method thereof |
| CN106116366A (en) * | 2016-06-30 | 2016-11-16 | 大连理工大学 | A kind of nano titanium oxide reinforced reactive-powder-concrete and preparation method thereof |
| CN108252473A (en) * | 2018-02-27 | 2018-07-06 | 三筑工科技有限公司 | A kind of architectural concrete, assembled combined wall board and preparation method thereof |
| CN109053211A (en) * | 2018-09-07 | 2018-12-21 | 怀宁建国混凝土制品有限责任公司 | A kind of low thermally conductive foamed cement |
| CN109400049A (en) * | 2018-10-08 | 2019-03-01 | 中建西部建设湖南有限公司 | A kind of anti-aggregate floating light ceramsite concrete and preparation method thereof |
| CN110078431A (en) * | 2019-06-03 | 2019-08-02 | 青岛中建富兴商砼有限公司 | Anti- isolation high-strength heat-insulating concrete of one kind and preparation method thereof |
| CN110590296A (en) * | 2019-10-30 | 2019-12-20 | 成都新柯力化工科技有限公司 | Lightweight concrete building material and preparation method thereof |
| CN110668750A (en) * | 2019-09-25 | 2020-01-10 | 中建西部建设北方有限公司 | Special high-impermeability compensation shrinkage concrete for urban underground comprehensive pipe gallery and preparation method thereof |
| CN111205036A (en) * | 2020-01-18 | 2020-05-29 | 杭州申华混凝土有限公司 | High-strength lightweight concrete and preparation method thereof |
| CN111559920A (en) * | 2020-04-08 | 2020-08-21 | 德昌县长和建材有限公司 | CH lightweight concrete |
-
2020
- 2020-09-09 CN CN202010937954.0A patent/CN111995317A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747006A (en) * | 2009-12-28 | 2010-06-23 | 宁波大学 | High-performance lightweight aggregate concrete |
| CN104986996A (en) * | 2015-06-25 | 2015-10-21 | 中铁第四勘察设计院集团有限公司 | Composite fiber macromolecular reinforced concrete sound barrier and manufacturing method thereof |
| CN106116366A (en) * | 2016-06-30 | 2016-11-16 | 大连理工大学 | A kind of nano titanium oxide reinforced reactive-powder-concrete and preparation method thereof |
| CN108252473A (en) * | 2018-02-27 | 2018-07-06 | 三筑工科技有限公司 | A kind of architectural concrete, assembled combined wall board and preparation method thereof |
| CN109053211A (en) * | 2018-09-07 | 2018-12-21 | 怀宁建国混凝土制品有限责任公司 | A kind of low thermally conductive foamed cement |
| CN109400049A (en) * | 2018-10-08 | 2019-03-01 | 中建西部建设湖南有限公司 | A kind of anti-aggregate floating light ceramsite concrete and preparation method thereof |
| CN110078431A (en) * | 2019-06-03 | 2019-08-02 | 青岛中建富兴商砼有限公司 | Anti- isolation high-strength heat-insulating concrete of one kind and preparation method thereof |
| CN110668750A (en) * | 2019-09-25 | 2020-01-10 | 中建西部建设北方有限公司 | Special high-impermeability compensation shrinkage concrete for urban underground comprehensive pipe gallery and preparation method thereof |
| CN110590296A (en) * | 2019-10-30 | 2019-12-20 | 成都新柯力化工科技有限公司 | Lightweight concrete building material and preparation method thereof |
| CN111205036A (en) * | 2020-01-18 | 2020-05-29 | 杭州申华混凝土有限公司 | High-strength lightweight concrete and preparation method thereof |
| CN111559920A (en) * | 2020-04-08 | 2020-08-21 | 德昌县长和建材有限公司 | CH lightweight concrete |
Non-Patent Citations (8)
| Title |
|---|
| 张巨松等: "《混凝土原材料》", 31 January 2019, 哈尔滨工业大学出版社, pages: 102 * |
| 沈春林: "《预拌砂浆的生产与施工》", 31 August 2015, 中国建材工业出版社, pages: 61 - 62 * |
| 王克: "当代混凝土材料的技术发展特点", 《辽宁建材》 * |
| 王克: "当代混凝土材料的技术发展特点", 《辽宁建材》, no. 01, 15 January 2008 (2008-01-15), pages 59 - 60 * |
| 王杏等: "《纳米二氧化钛的生产与应用》", 31 July 2014, 贵州科技出版社, pages: 55 * |
| 王洪镇等: "《流态轻集料微孔混凝土技术》", 31 October 2013, 中国建材工业出版社, pages: 74 * |
| 高建明等: "聚合物乳液对纤维增强轻集料混凝土力学性能的影响", 《东南大学学报》 * |
| 高建明等: "聚合物乳液对纤维增强轻集料混凝土力学性能的影响", 《东南大学学报》, vol. 36, no. 2, 31 March 2006 (2006-03-31), pages 1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114044693A (en) * | 2021-12-02 | 2022-02-15 | 陕西汇丰高性能粉体材料有限公司 | Ceramsite concrete and preparation method thereof |
| CN115259790A (en) * | 2022-07-22 | 2022-11-01 | 武汉工程大学 | Light high-strength mortar based on clay calcined by limestone powder and preparation method thereof |
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