Novel post-cast strip concrete

Abstract

The invention discloses novel post-cast strip concrete. The novel post-cast strip concrete consists of the following components in part by mass: 100 parts of cement, 90 to 120 parts of ordinary sand, 270 to 290 parts of stone, 5 to 16 parts of rubber, 0.5 to 0.8 part of additive and 30 to 45 parts of water, wherein the additive is a water-reducing agent and the water-reducing rate is more than 35 percent; the cement is the ordinary Portland cement; the ordinary sand is one of river sand, lake sand and artificial sand, the fineness modulus range is 2.3 to 3.0 and the maximum grain size is less than 4.75 mm; the stone is continuous graded broken stone of 5 to 20 mm; the rubber is manufactured by processing waste rubber products; the materials with the granularity range from 1 and 2.5 mm is more than or equal to 95 percent; and the maximum grain size of the rubber grains is less than 5 mm. Compared with the post-cast strip concrete, the novel post-cast strip concrete has excellent deformation performance and high plastic cracking resistance and reduces the internal stress value. The rubber grains are applied to the concrete, so the solid waste is effectively utilized.

Description

technical field [0001] The invention relates to a building material, in particular to a post-cast strip concrete which can be widely used in the construction of multi-storey or high-rise buildings. Background technique [0002] The post-pouring belt is a temporary construction joint set up to overcome possible cracks due to temperature and shrinkage during the construction of cast-in-place reinforced concrete structures. The joint needs to be reserved for a period of time before pouring according to requirements to connect the entire building as a whole. [0003] According to the standard requirements, when the length of the poured concrete exceeds 30m-60m, it is necessary to set up the post-casting belt. The post-cast belt is a part that is easy to produce quality and safety. If it is not handled properly, it will deviate from the original design intention. The design and construction quality of the post-cast belt directly affects the safety and function of the structure. ...

AI Technical Summary

Problems solved by technology

For the preparation of post-cast concrete, there are also various methods in construction. Usually, post-cast concrete is made of ordinary concrete. The strength of ordinary concrete is the same as that of old concrete or one level higher. According to needs, expansion components are usually added to ordinary concrete. Or add an admixture with an expansion effect to reduce shrinkage to ensure the bond between the concrete and the old concrete matrix. After this treatment, the post-casting belt is also the place where quality problems are most likely to occur. The post-casting belt often has cracking or water leakage problems. The fundamental problem is that the deformation of ordinary concrete or the concrete added with expansion agent components is small, which cannot meet the deformation requirements of structures. The present invention relates to a high deformation post-cast concrete, which has high deformation performance, small internal stress value and has Good anti-plastic cracking performance, fundamentally solve the problem of cracking or water leakage of the post-casting belt

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