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Closed water-saturated internal curing lightweight aggregate and preparation method thereof

A light-weight aggregate and closed-type technology, which is applied in the field of closed-type saturated water curing light-weight aggregate and its preparation, can solve the problems of large amount of admixture, large difference in water content, large slump loss, etc. The problem of uneven water content, the effect of eliminating adsorption and reducing the evaporation rate

Active Publication Date: 2021-01-26
山东省建筑科学研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the large difference in water content between the upper and lower layers of lightweight aggregates in the existing technology, the internal voids absorb water and easily block the pipeline, the amount of admixture used is large, and the release of water from the superabsorbent polymer causes internal holes in the concrete and the late slump of the concrete mixture Due to the problems of large loss of strength, high cost and large loss, the invention provides a closed water-saturated internal curing lightweight aggregate and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Soak fly ash ceramsite in tap water for 24 hours;

[0032] (2) Superabsorbent polymer monomer (a mixture of acrylic acid and acrylamide with a mass ratio of 5:1), neutralizing agent (sodium hydroxide), and crosslinking agent (N, N-methylenebisacrylamide) 1. The initiator (potassium persulfate) is dissolved in deionized water, wherein the amounts of N, N-methylenebisacrylamide and potassium persulfate are respectively 0.2wt% and 0.03wt% of the total amount of superabsorbent polymer monomers, The amount of neutralizing agent is to make the neutralization degree of the superabsorbent polymer monomer reach 70%; The base bisacrylamide is diluted with warm water at 40-50°C to a 0.04wt% solution, the concentration of potassium persulfate is 0.4wt%, and the total mass of all solutions accounts for 5 wt% of the dry mass of fly ash ceramsite;

[0033] (3) Drain the water on the surface of the fly ash ceramsite after soaking in water in step (1), transfer it to a vacuum kettl...

Embodiment 2

[0037] (1) Soak clay pottery sand in tap water for 36 hours;

[0038] (2) superabsorbent polymer monomer (a mixture of acrylic acid and acrylamide with a mass ratio of 2.5:1), neutralizer (sodium hydroxide), crosslinking agent (N, N-methylenebisacrylamide), The initiator (potassium persulfate) is dissolved in deionized water, wherein the amounts of N,N-methylenebisacrylamide and potassium persulfate are respectively 0.3wt% and 0.06wt% of the total amount of superabsorbent polymer monomers, The amount of neutralizing agent is to make the superabsorbent polymer monomer neutralization degree reach 90%; the superabsorbent polymer monomer concentration is 40wt%, the sodium hydroxide aqueous solution concentration is 25wt%, Bisacrylamide is diluted with warm water at 40-50°C to a 0.08wt% solution, and the concentration of potassium persulfate is 0.8wt%; the total mass of all solutions accounts for 7wt% of the dry mass of clay pottery sand particles;

[0039] (3) Drain the surface m...

Embodiment 3

[0043] In order to compare the slump of concrete over time by using ordinary lightweight aggregate (ordinary ceramsite and ordinary ceramsite) and the closed water-saturated internal curing light aggregate (Example 1 and Example 2) prepared by the preparation method of the present invention The impact of loss and pumping slump loss, using the method of fixing the volume of slurry and aggregate, using the water-cement ratio of 0.30, 0.40, and 0.50 to prepare the concrete of Comparative Example 1 and Application Example 1, the mass of ordinary lightweight aggregate It is the dry quality, soaked in water for 24 hours and then added. The lightweight aggregates prepared in Example 1 and Example 2 are the actual quality. The initial slump of concrete is controlled at about 200mm by adjusting the amount of water reducing agent. The specific combination is as follows: Table 1 shows.

[0044] Table 1 Concrete mix ratio (kg / m 3 )

[0045] .

[0046] Measure the slump loss over time...

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Abstract

The invention discloses a closed water-saturated internal curing lightweight aggregate and a preparation method thereof. The preparation method comprises the following steps: soaking the lightweight aggregate in water, keeping the water-absorbed lightweight aggregate under negative pressure for a certain period of time, spraying a polymer reaction solution onto the surface of the lightweight aggregate under negative pressure, continuously performing stirring, and performing pressurizing after spraying; Macromolecules are subjected to a cross-linking reaction in a microwave treatment mode to obtain the closed water-saturated internal curing lightweight aggregate. According to the invention, a super absorbent resin blocking coating layer is formed in surface pores of the water-saturated lightweight aggregate, so that the preparation of the closed water-saturated internal curing lightweight aggregate is realized, and the problems of quick draining and evaporation of the water-saturated lightweight aggregate and great change of moisture contents of upper and lower layers of a material pile are eliminated; admixture adsorption, slump loss and pipe blockage in the pumping process when the concrete additive is used for concrete are eliminated, the internal water storage capacity and internal humidity of concrete are improved, early self-shrinkage of concrete is improved, the requirement and frequency of external maintenance of concrete are reduced, and the closed water-saturated internal curing lightweight aggregate has important economic and practical value.

Description

technical field [0001] The invention belongs to the technical field of composite materials and their preparation, and in particular relates to a closed water-saturated internal curing lightweight aggregate and a preparation method thereof. Background technique [0002] Traditional concrete curing methods mainly adopt external curing methods, such as direct watering, watering with straw bags, covering film, and spraying emulsions that inhibit water evaporation, etc. These methods only have a certain curing effect on the concrete surface. For high-performance concrete, due to its dense material structure, moisture in the outer layer is difficult to penetrate, and the interior of the concrete cannot be fully cured. Therefore, it is difficult to effectively relieve the self-shrinkage of concrete only through traditional external curing methods. Concrete internal curing can keep the relative humidity inside the concrete at a high level, promote the hydration of cement and mineral...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B18/02
CPCC04B20/1037C04B18/027
Inventor 沈文忠王伟郭宗帅马云倩台威张昊哲
Owner 山东省建筑科学研究院有限公司
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