Crack-resistant reinforced concrete for buildings and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and discloses crack-resistant reinforced concrete for buildings and a preparation method thereof. The crack-resistant reinforced concrete for the buildings is prepared from the following components in parts by weight: 70-80 parts of sea sand, 40-50 parts of cement, 20-30 parts of modified fly ash, 10-20 parts of sepiolite, 30-40 parts of water, 10-20 parts of polyethyleneimine aqueous solution, 10-20 parts of modified plant straw fiber, 7-15 parts of water-soluble polyvinyl alcohol fiber, 5-10 parts of nano powder and 3-5 parts of silane coupling agent. According to the concrete, the dodecyl trimethyl ammonium chloride modified fly ash and the modified fibers are added, and then the nano-powder is added so that the densityof the concrete is greatly improved, and the strength of the concrete is improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a crack-resistant reinforced concrete for building and a preparation method thereof. Background technique [0002] Concrete is a general term for engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Generally speaking, the term concrete refers to the cement concrete which is made of cement as the cementitious material, sand and stone as the aggregate; mixed with water in a certain proportion and stirred, also known as ordinary concrete, which is widely used in civil engineering. In concrete, sand and stone act as the skeleton, which is called aggregate; cement and water form cement slurry, which wraps on the surface of the aggregate and fills its gaps. Before hardening, the cement slurry acts as a lubricant, giving the mixture a certain Workability, easy construction, after the cement slurry hardens, the aggregate ...

AI Technical Summary

Problems solved by technology

However, due to the large surface energy of the above-mentioned ultrafine powder, the self-shrinkage of the concrete added with the above-mentioned ultrafine powder is greatly increased, which increases the risk of cracking of the concrete and reduces the durability of the concrete. Therefore, the existing concrete often has low strength. , poor durability and easy cracking

In order to solve the problem of low concrete strength, Chinese patent CN110467384 discloses a light-weight high-strength concrete and its preparation method. The light-weight high-strength concrete provided by the invention has good mechanical properties

However, in order to obtain the concrete, it is necessary to mix sepiolite with water, add Bacillus pasteurianus, urea and magnesium nitrate, stir and mix, concentrate by rotary evaporation, dry, and calcinate to obtain modified sepiolite. Modification of fiber and fly ash, the process is complex, and more expensive peach glue with less source of material needs to be added, which is not conducive to large-scale industrial production and application