High-strength high-toughness self-leveling light aggregate concrete and preparation method thereof

Abstract

The invention relates to high-strength high-toughness self-leveling light aggregate concrete and a preparation method thereof. The light aggregate concrete is made of cementing materials, leveling agents, toughening materials, sand, a crude aggregate and water through mixing, wherein the cementing materials are ordinary Portland cement, glass beads and nano micro silicon powder; the leveling agents are a slump-prevention type water reducing agent and an associated thickening leveling agent; the toughening materials are an ethylene-vinyl acetate copolymer emulsion, an epoxy modified acrylic emulsion and a polyvinyl alcohol fiber; the sand is medium sand; and the crude aggregate is shale macadam ceramsite. The preparation method comprises the following steps: firstly, uniformly stirring theethylene-vinyl acetate copolymer emulsion, the epoxy modified acrylic emulsion, the nano micro silicon powder and the shale macadam ceramsite for 1 minute, leaving the mixture to stand for 3 minutes,and further stirring the mixture with the sand, the cement, the glass beads, the water, the polyvinyl alcohol fiber and the associated thickening leveling agent for 3 minutes. The light aggregate concrete provided by the invention has the characteristics of being light in weight, high in strength, free of light aggregate floating, good in flowability, high in toughness and small in shrinkage, canbe applied to large-span bridges and auxiliary structures thereof, and can be also applied to industrial and civil high-rise buildings.

Description

technical field [0001] The invention relates to a high-strength and high-toughness self-leveling lightweight aggregate concrete. The material is suitable for long-span bridges and their auxiliary structures, and also for industrial and civil high-rise buildings. The material belongs to the technical field of cement-based composite materials. Background technique [0002] With the rapid development of my country's society and economy, infrastructure construction is booming, and land resources are becoming more and more scarce. In order to meet the needs of the use environment and site conditions, building structures are gradually developing in the direction of large spans and towering towers. Concrete is an engineering material with excellent durability and good economy. It has been widely used in civil engineering structures. However, the density of concrete is relatively high, and the density of ordinary concrete is 2400kg / m 3 , with the construction of high-rise buildings ...

AI Technical Summary

Problems solved by technology

However, with the improvement of the strength of lightweight aggregate concrete, the brittleness of lightweight aggregate concrete is also increasing, and with the increase of concrete fluidity, the probability of floating of lightweight aggregate is greater, which is easy to cause concrete segregation. Pumping concrete in high-rise buildings is easy to block pipes, and it is more difficult to apply to steel pipe arch concrete

The traditional method is to add cellulose ether, polymer or fiber. Although these methods can improve the toughness of lightweight aggregate concrete and reduce the floating rate of aggregate, they will reduce the compressive strength of concrete and have a great impact on the fluidity of concrete. Therefore, it is difficult to prepare high-strength self-leveling lightweight aggregate concrete above LC55 by traditional technology

[0003] For this reason, the present invention aims at the problems existing in the current lightweight aggregate concrete, and proposes a high-strength, high-toughness self-leveling lightweight aggregate concrete and its preparation method. Starting from the composition of raw materials and the mixing process, it solves the problems of concrete fluidity, light weight Aggregate is easy to float and brittle

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