Search

CN-122010518-A - Foam concrete material capable of rapidly responding to drying environment and precast slab

CN122010518ACN 122010518 ACN122010518 ACN 122010518ACN-122010518-A

Abstract

The invention relates to a foam concrete material and a precast slab which rapidly respond to a drying environment, wherein the raw materials comprise, by mass, 300-600 parts of cement, 150-300 parts of blast furnace slag, 20-50 parts of anhydrous calcium sulfate, 50-200 parts of micro-active aggregate, 7-10 parts of polypropylene fiber, 5-7 parts of polypropylene fiber, 100-300 parts of regenerated micro powder, 0.2-1 part of nano foaming agent, 2-6 parts of polycarboxylate water reducer mother solution, 10-50 parts of AFt seed crystal and 0.1-0.2 part of hydroxypropyl methyl cellulose. The foam concrete precast slab provided by the invention utilizes the regenerated micro powder and slag to replace part of cement, and simultaneously adopts the micro-active aggregate composite AFt seed crystal, so that the problem of long shrinkage period of the foam concrete precast slab is effectively solved, the utilization rate of solid waste resources is also improved, and the problem of lower strength of the foam concrete in the prior art is solved.

Inventors

  • WANG QIONG
  • ZENG WEILAI
  • LIU WEICHENG
  • HUANG MINGYANG
  • YAO JIE

Assignees

  • 中建海龙科技有限公司
  • 安徽海龙建筑工业有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. The foam concrete material capable of rapidly responding to a drying environment is characterized by comprising, by mass, 300-600 parts of cement, 150-300 parts of blast furnace slag, 20-50 parts of anhydrous calcium sulfate, 50-200 parts of micro-active aggregate, 7-10 parts of polypropylene fiber, 5-7 parts of polypropylene fiber, 100-300 parts of regenerated micropowder, 0.2-1 part of nano foaming agent, 2-6 parts of polycarboxylate water reducer mother liquor, 10-50 parts of AFt seed crystal and 0.1-0.2 part of hydroxypropyl methyl cellulose.
  2. 2. The foam concrete material of claim 1, further comprising 150-250 parts of water.
  3. 3. The foam concrete material according to claim 1, wherein the cement is high-strength silicate 52.5 cement, the aluminum phase content of the blast furnace slag is 16-20wt% based on aluminum oxide, the micro-active aggregate is solid waste floating beads, the solid phase content of the polycarboxylate water reducing agent mother liquor is 45-55wt%, and the nano foaming agent is composite foam stabilizer type anionic surfactant foam powder.
  4. 4. The foam concrete material according to claim 1, wherein the regenerated micro powder is a micro powder obtained by crushing and grinding waste concrete, and the particle size of the regenerated micro powder is 0.075-0.15 mm.
  5. 5. The foam concrete material according to claim 1, wherein the polypropylene fibers have a diameter of 18-48 μm and a length of 6-8 mm, and the polypropylene fibers have a diameter of 18-48 μm and a length of 6-12 mm.
  6. 6. The preparation method of the foam concrete precast slab capable of rapidly responding to the drying environment is characterized by comprising the following steps of: The method comprises the following steps of preparing raw materials, by mass, 300-600 parts of cement, 150-300 parts of blast furnace slag, 20-50 parts of anhydrous calcium sulfate, 50-200 parts of micro-active aggregate, 150-250 parts of water, 7-10 parts of polypropylene fiber, 5-7 parts of polypropylene fiber, 100-300 parts of regenerated micro powder, 0.2-1 part of nano foaming agent, 2-6 parts of polycarboxylate water reducer mother liquor, 10-50 parts of AFt seed crystal and 0.1-0.2 part of hydroxypropyl methyl cellulose; s2, pretreatment of raw materials: soaking the micro-active aggregate in alkali liquor overnight for standby; uniformly stirring cement, blast furnace slag, anhydrous calcium sulfate and regenerated micro powder to obtain dry powder; adding 40-60% of total water and 40-60% of total polycarboxylate superplasticizer mother liquor into AFt seed crystal, and performing dispersion treatment to prepare AFt seed crystal water agent for later use; dissolving hydroxypropyl methyl cellulose in water accounting for 5-10% of the total water content to prepare HPMC water solution; S3, adding the soaked and drained micro-active aggregate into the dry powder, stirring and mixing uniformly, adding the rest water, the polycarboxylate water reducer mother solution and the HPMC water solution, stirring at a medium speed, adding the AFt seed crystal water agent after the slurry state is stable, continuing stirring, and adding polypropylene fibers and polypropylene fibers, stirring and mixing uniformly; s4, adding foam which is well foamed by the nano foaming agent through physical foaming, stirring again to obtain slurry, filling the slurry into a precast slab die, and curing to obtain the foamed concrete precast slab of the composite micro-active aggregate in a quick response dry environment.
  7. 7. The method according to claim 6, wherein in the step S2, the pH value of the alkaline solution is 10-12, and the soaking time is 20-24 hours.
  8. 8. The preparation method of claim 6, wherein in step S2, an ultrasonic dispersing machine is used for dispersing treatment in the preparation process of the AFt seed water agent, and the ultrasonic time is 30-90S.
  9. 9. The method of claim 6, wherein in step S4, the physical foaming is foaming by a foaming machine.
  10. 10. The manufacturing method according to claim 6, wherein in step S4, the mold is stuck to five surfaces of the inner side of the mold with an extremely thin iron sheet before use, and lubricating oil is applied between the iron sheet and the mold; the curing method is that the coating is cured for 3-7 days.

Description

Foam concrete material capable of rapidly responding to drying environment and precast slab Technical Field The invention relates to a foam concrete material and a precast slab capable of rapidly responding to a drying environment, and belongs to the technical field of foam concrete materials. Background The foam concrete is used as a light, heat-insulating and sound-insulating green building material, and is widely applied to the engineering fields of building walls, roof heat insulation, foundation backfill and the like by virtue of the advantages of light weight, high strength, convenient construction, energy conservation, environmental protection and the like. Along with the increasing demand of the building industry for green building materials, the preparation of foam concrete by utilizing industrial solid wastes becomes an industry development trend, so that the raw material cost can be reduced, the recycling of solid wastes can be realized, and the development strategy of double carbon is met. However, the existing foam concrete still has a plurality of technical bottlenecks in practical application, especially shrinkage stability and mechanical property defects in a natural curing environment, and the application range and the service life of the existing foam concrete are severely limited. Specifically, the existing foam concrete has the characteristics of long period and uncontrollable shrinkage process, namely in a natural use environment, the drying shrinkage and chemical shrinkage process often lasts for months or even years, continuous tensile stress can be formed in the material due to long-term volume shrinkage, and meanwhile, due to non-uniformity of the shrinkage process, the tensile stress is easily concentrated at weak parts such as wall joints and corners, so that penetrating cracks are initiated. In addition, the existing foam concrete has inherent defects of low strength and poor crack resistance, and the performance degradation of materials can be further aggravated after the crack is generated, so that the safety and durability of the building structure are reduced. In order to solve the problems, the prior art is improved by optimizing the proportion of the cementing material, adding a fiber reinforcing agent or a water reducing agent and the like, but the effects are not ideal. On one hand, the conventional fiber reinforcing agent can improve the cracking resistance to a certain extent, but hardly shortens the shrinkage period fundamentally, on the other hand, the utilization of industrial solid wastes in the prior art is stopped at a simple mixing layer, the synergistic effect of the active components of the industrial solid wastes is not fully exerted, a targeted seed crystal induction regulation and control means is lacked, the hydration process and microstructure of the foam concrete cannot be effectively improved, and multiple requirements of solid waste utilization, shrinkage control and mechanical property improvement are difficult to be met. Therefore, developing a foam concrete material which can quickly respond to a drying environment, effectively shorten the shrinkage period, has high strength and excellent crack resistance, and can realize the efficient utilization of industrial solid wastes becomes a technical problem to be solved in the current field. Disclosure of Invention First, the technical problem to be solved In order to solve the problems in the prior art, the invention provides a foam concrete material and a precast slab which can quickly respond to a dry environment, and the technical problems of low strength and long shrinkage period of the foam concrete in the foam concrete of the traditional aggregate are solved by utilizing solid wastes to replace conventional foam concrete components and utilizing the characteristics of micro-active aggregate and the action of seed crystals. (II) technical scheme In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps: The invention provides a foam concrete material capable of rapidly responding to a dry environment, which comprises, by mass, 300-600 parts of cement, 150-300 parts of blast furnace slag, 20-50 parts of anhydrous calcium sulfate, 50-200 parts of micro-active aggregate, 7-10 parts of polypropylene fiber, 5-7 parts of polypropylene fiber, 100-300 parts of regenerated micropowder, 0.2-1 part of nano foaming agent, 2-6 parts of polycarboxylate water reducer mother solution, 10-50 parts of AFt seed crystal and 0.1-0.2 part of hydroxypropyl methyl cellulose; wherein, the micro-active bone, the polycarboxylate superplasticizer mother solution, the AFt seed crystal and the nano foaming agent are respectively and independently packaged, and other residual raw materials can be mixed and packaged together. The foam concrete material as described above, preferably, further comprises 150 to 250 parts of water when used for preparing a foam concrete prec