High-strength thermal insulation all-light concrete and its preparation method and application

Abstract

The invention discloses high-strength thermal insulation full lightweight concrete and a preparation method and application thereof. The high-strength thermal insulation full lightweight concrete comprises, by weight, 25.1-30.8 parts of ordinary portland cement, 6.3-7.7 parts of class-II flyash, 0.38-0.46 part of water-reducing agents, 0.06-0.08 part of water-retaining agents, 1-6 parts of floating beads, 1-6 parts of ceramic hollow microspheres, 0.08-0.1 part of polypropylene fibers, 39.20-48.86 parts of haycite and 0-26.9 parts of pottery sand. According to the high-strength thermal insulation full lightweight concrete and the preparation method and application thereof, the haycite and the pottery sand are adopted, and particularly by means of the floating beads and the ceramic hollow microspheres, the density of the full lightweight concrete is reduced; meanwhile, the water-reducing agents and the polypropylene fibers are adopted, the strength of the full lightweight concrete is improved, and the contradiction between the density and the strength is successfully solved; the good thermal insulation effect is achieved; the processing property is good, cellulose ether, the polypropylene fibers and the water-reducing agents are adopted, the defect that lightweight aggregate is prone to hollowing and cracking due to the fact that the lightweight aggregate floats upward and is delaminated is prevented, the material homogeneity is good, two procedures, namely steel wire gauze laying and fine aggregate concrete protective layer laying, are omitted, and the construction performance and workability are good.

Description

technical field [0001] The invention relates to a high-strength heat-preserving all-light concrete, in particular to a kind of all-light concrete with heat-preserving and heat-insulating functions and low self-weight, which is used for building floors and layered floors. Background technique [0002] With the deepening of the promotion and application of energy-saving buildings, household floor slabs must take insulation measures to meet the basic threshold requirements of 65% building energy efficiency. At present, the materials used for the insulation layer of household floor slabs include inorganic insulation mortar, polystyrene particle insulation mortar, foam concrete, benzene board, and composite silicate board. However, these insulation layers have low strength and require a protective layer on their surface (usually Use fine stone concrete), so firstly, the construction process is complicated, and secondly, the material properties of the protective layer and the insu...

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Problems solved by technology

[0004] There are few public research results on all-light concrete, mainly, the article "Research on the Performance of Low-quality Ceramsite All-light Concrete Modified by Expanded Glass Beads" was published in the second issue of "New Building Materials" in 2014. A full-light concrete with a dry density as low as 891kg / m3 is prepared, but the strength is too low. The 28-day compressive strength is only 13.3MPa, and the construction performance is poor. The slump is only 120-150mm

In the 10th issue of "Silicate Bulletin" in 2013, the article "Study on the Effects of Cellulose Ether and Sand Rate on the Performance of All Lightweight Concrete" was published. In this paper, the use of cellulose ether can significantly improve the workability of all lightweight concrete, but to a large extent The strength of the all-light concrete is reduced, and after comprehensive consideration, only the all-light concrete with a compressive strength of 15.3MPa and a dry density of 1109kg / m3 is prepared.

In the 8th issue of "New Building Materials" in 2013, the article "All-light Concrete Preparation Scheme Based on Compressible Packing Model" was published. balance point

③The problem of cracking and hollowing after hardening

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