Carboxylic acid polyalcohol water reducing agent capable of controlling concrete slump loss

Abstract

The invention relates to carboxylic acid polymer which is an admixture of concrete which can control the slump loss of the concrete. Hydroxyl bifunctional polyether esterifies with bifunctional maleic or the acid anhydride of maleic to produce crosslinked large monomer, and copolymerizes with allylic alcohol ether and bifunctional small monomer to produce certain molecular weight polymer. The water-reducing agent can incessantly release small molecular weight water-reducing agent during the hydration of the cement, thereby the goal of continuously restraining slump loss is achieved.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a water reducing agent used for controlling the slump loss of concrete. Background technique [0002] Concrete is made of cement, sand, stone, and water. For the convenience of construction, the amount of water added is related to the workability and fluidity of concrete, but the level of water content is also related to the loss of concrete slump. Concrete slump loss is an inevitable phenomenon in the process of concrete application, but excessive slump loss will affect the construction quality. During construction, the concrete slump loss is required to be as small as possible. Water reducer is an admixture with water reducing and retarding effects, which can improve the workability and rheology of concrete, and can reduce water consumption without affecting workability and rheology, thereby reducing concrete Slump loss; or under the condition that the concrete slump is basi...

AI Technical Summary

Problems solved by technology

However, as the cement hydration reaction proceeds, the molecules of the water reducer that were originally adsorbed on the surface of the cement particles will be covered by the hydration products of the cement, which reduces the dispersion effect of the water reducer, resulting in the loss of slump of freshly mixed concrete.

In addition, some water reducers have good performance, but the price is relatively high, which increases the cost of use.

Patent CN1667009A discloses a preparation method for concrete slump retaining agent, the preparation process adopts esterification-polymerization method, but the process reaction temperature is relatively high and energy consumption is large

Images