Anti-bleeding agent for concrete, preparation method of anti-bleeding agent, concrete admixture and concrete

Abstract

The invention belongs to the technical field of concrete admixtures, and particularly relates to an anti-bleeding agent for concrete, a preparation method of the anti-bleeding agent, a concrete admixture and concrete. The preparation method of the anti-bleeding agent for concrete comprises the following steps: adding a polymerized small monomer, a reducing agent and a chain transfer agent into a dropwise adding tank to prepare a polymerized small monomer solution; sequentially adding the modified alkenyl polyoxyethylene ether and an oxidizing agent into a reaction container to prepare a modified alkenyl polyoxyethylene ether solution; and dropwise adding the polymerized small monomer solution into the modified alkenyl polyoxyethylene ether solution, and carrying out heat preservation reaction to obtain the concrete anti-bleeding agent. The anti-bleeding agent for concrete provided by the invention has a slow-release cementing material dispersion group and a special long-chain molecular structure. On the premise of keeping the workability of the concrete over time, the water-reducing rate and bleeding rate of the admixture are reduced, and the concrete is prevented from segregation after being discharged from the machine.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to an anti-bleeding agent for concrete, a preparation method, a concrete admixture and 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 greatly increased. [0003] The phenomenon that the coarse aggregate sinks and the water floats up during the transportation, vibration, and pumping of concrete is called concrete bleeding. Bleeding is an important aspect of the workability of fresh concrete. [0004] Due to the high density of aggregates such as sand and stone used to prepare ordinary concrete, the density of aggregates such as sand and stone differs greatly from other components in ordinary concrete, so that ordinary concrete may appear during the mixing process. Aggregate sinks, moisture rises, and bleeding occurs, which will ...

AI Technical Summary

Problems solved by technology

Using ordinary anti-bleeding agents or changing the ratio of admixtures to improve the bleeding phenomenon of the machine will easily cause the loss of concrete fluidity over time, poor workability after delivery to the construction site, etc.

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