Concrete

Abstract

The invention discloses concrete which comprises the following ingredients in parts by weight: 180-280 parts of cement, 50-70 parts of mineral powder, 50-80 parts of coal ash, 920-980 parts of stone, 700-750 parts of fragment, 100-200 parts of sand, 170-200 parts of water, 5-9 parts of water reducer and 1.8-2.5 parts of CTF concrete synergist. According to the concrete, the fragment replaces the most sand and a part of the stone, and an action of the CTF concrete synergist is fully exerted to improve the dispersity of cement particles and an effect of the water reducer, so that the concrete solves the problems that due to poor gradation of the stone and the sand, the fresh concrete is poor in cohesiveness and water retention, and easy to isolate and bleed, the workability and flowability are reduced, the strength and durability of the concrete are reduced, the early contraction is aggravated, a water ripple phenomenon on the surface of the hardened concrete is severe, and the sensory quality of a concrete structure is influenced.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to concrete. Background technique [0002] With the rapid development of the economy, my country's construction industry is also developing rapidly, and the use of concrete has also increased greatly. However, during the pouring and hardening process of concrete, volume shrinkage will occur due to reasons such as chemical reduction, cold shrinkage and dry shrinkage. And the more cement and water used per unit, the larger the concrete volume, the faster the water evaporates, and the more obvious the shrinkage. Generally, every 1m 3 The shrinkage value of concrete is 0.04-0.09%, which leads to adverse consequences such as cracking, leakage, corrosion of steel bars, and loss of prestress in concrete. [0003] In order to solve this problem, according to different concrete mix ratios, curing systems and restraint states, adding an appropriate amount of expansion agent or water...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a kind of concrete, which can give full play to the effect of CTF concrete synergist to improve the dispersibility of cement particles, improve the effect of water reducing agent, and solve the problems of shortening setting time and ensure excellent slump , workability and compressive strength

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