Concrete with low slump loss and preparation method thereof

Abstract

The invention discloses a concrete with low slump loss and a preparation method thereof, and relates to the technical field of concrete. The concrete comprises following components in parts by weight:240 to 420 parts of cement, 70 to 100 parts of fly ash, 900 to 1000 parts of river sand, 950 to 1100 parts of broken stone, 190 to 210 parts of water, 5 to 10 parts of water reducer, and 1.8 to 2.2 parts of combined fiber. The water reducer is prepared by the following steps: adding methyl allyl polyoxyethylene ether, diethyl maleate, and water into a reactor, evenly mixing, stirring, then simultaneously dropwise adding maleic anhydride, a water solution of sodium methyl allyl sulfonate, and a water solution of ammonium persulfate, after dropwise addition, keeping the temperature for one hour, cooling to the room temperature, and adjusting the pH value to 5-7 by a hot NaOH saturated solution. The concrete has good dispersibility and fluidity after the modified water reducer is added, andthe concrete quality is largely improved.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a low slump loss concrete and a preparation method thereof. Background technique [0002] Slump loss, that is, the phenomenon that the concrete mixture gradually thickens after a certain period of time, and the cohesion increases and the fluidity decreases. [0003] The slump loss of concrete is a problem often encountered in the use of commercial concrete. Due to the characteristics of commercial concrete production, its transportation and waiting time are long, and the time difference between mixing and pouring of fresh concrete is often as long as 2 hours or even longer. , which results in a loss of slump. Especially in the hot summer, the slump loss of concrete is too large, which makes it difficult to pump or densely convey concrete during on-site pouring, thereby affecting construction efficiency. In addition, in order to solve the problem of poor concret...

AI Technical Summary

Problems solved by technology

[0003] The slump loss of concrete is a problem often encountered in the use of commercial concrete. Due to the characteristics of commercial concrete production, its transportation and waiting time are long, and the time difference between mixing and pouring of fresh concrete is often as long as 2 hours or even longer. , which results in a loss of slump

Especially in the hot summer, the slump loss of concrete is too large, which makes it difficult to pump or densely deliver concrete during on-site pouring, thus affecting construction efficiency

In addition, in order to solve the problem of poor concrete fluidity, the construction unit often adds water unrestrainedly, resulting in a decrease in the strength of the concrete, which affects the quality of the concrete, resulting in unqualified building strength

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