Curing agent in ceramsite carrier concrete and preparation method thereof

Abstract

The invention discloses a curing agent in ceramsite carrier concrete. A preparation method of the curing agent comprises the following steps that an acrylic acid solution, 2-acrylamide-2-methacrylic acid, initiators and crosslinking agents are uniformly mixed to prepare a reaction solution a; an etherificated sodium alginate solution, an acrylamide solution, initiators and crosslinking agents areuniformly mixed to prepare a reaction solution b; ceramsite is sequentially soaked in the reaction solution a and the reaction solution b, and is sequentially subjected to microwave treatment. Firstly, the ceramsite is used as a carrier; the polymerization of water absorption resin is performed inside and outside the ceramsite; meanwhile, a hole-inside hole-outside two-step method is used; the building of polymers with different water absorption rates inside and outside holes is realized; the prepared curing agent in the ceramsite carrier concrete can greatly improve the humidity inside the concrete; the early-period reduction and shrinkage effect of the concrete is obvious; meanwhile, the curing agent in the ceramsite carrier concrete has the advantages that the water absorption and waterrelease rate is slow; the use performance such as concrete strength is favorably guaranteed; important application and promotion values are realized.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a ceramsite-carrier concrete internal curing agent and a preparation method thereof. Background technique [0002] With the rapid development of modern concrete technology towards high-strength concrete characterized by low water-binder ratio and high cementitious materials, concrete is also facing problems such as large early drying shrinkage and high crack sensitivity; the key to solving the above problems lies in concrete maintenance. At present, the commonly used maintenance methods in the industry include sprinkling, spraying, film coating and spraying emulsions that inhibit water evaporation. However, these methods only maintain the surface of the concrete, and it is difficult for the water to reach the area where the unhydrated cementitious material is located inside. Timely maintenance. [0003] At present, there are mainly two types of maintenance methods f...

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Problems solved by technology

At present, the commonly used maintenance methods in the industry include sprinkling, spraying, film coating and spraying emulsions that inhibit water evaporation. However, these methods only maintain the surface of the concrete, and it is difficult for the water to reach the area where the unhydrated cementitious material is located inside. timely maintenance

[0003] At present, there are mainly two types of maintenance methods for the interior of concrete: one is porous light aggregate and ceramsite ceramsite, which has poor water absorption capacity, poor internal maintenance performance, and poor economy; the other is cross-linked polyacrylic acid. However, this type of superabsorbent resin has the following disadvantages: 1) The water absorption rate is large, the water absorption rate is fast, and the volume expansion is serious, so it is easy to affect the concrete work performance and later strength; 2) The salt resistance is poor, in Unstable release of pre-absorbed water in concrete strong alkaline environment leads to fluctuations in concrete performance

[0004] In order to solve the above problems, CN105330334A in the prior art scheme discloses a method of using a silane-modified cross-linked polycarboxylate water-absorbing resin as an internal curing agent for concrete, which reduces the water absorption rate and ensures the stable performance of concrete. However, the silane coupling agent Expensive, high cost

CN105439490A discloses a polyacrylic acid water-absorbing resin with a core-shell structure. Although the influence of the water absorption rate on the performance of concrete is delayed, the strength data is not published in this plan, but it is scientifically foreseeable that the volume of this type of water-absorbing resin will shrink after releasing water , forming clusters inside the concrete, thereby forming a stress-weak zone of honeycomb holes inside the concrete, which ultimately affects the strength of the hardened concrete; in addition, this patent mainly reduces the water absorption rate by performing hydrophobic treatment on the surface of the internal curing polymer, but the hydrophobic treatment The process requirements are complex, and the large surface tension hydrophobic treatment will lead to non-absorption, which will have an adverse effect on the water absorption process of the internal curing agent

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