Additive for middle-or low-strength concrete

Abstract

An additive for middle-or low-strength concrete is prepared from powdered coal ash (88-98 wt.%), dedusted ash (0.38-6.18%), calcium lignosulfonate (0.15-1.5%), sodium chloride (1-4%), triethanolamine(0.1-0.2%) and rosin soap (0.02-0.1%). Its advantages include widely available raw materials, low cost, and high performance of concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an admixture of medium- and low-strength grade concrete which is a mixed cementitious material with fly ash whose technical index conforms to three varieties of GB1596-91 as a base material. Background technique [0002] Chinese patent discloses a kind of formula that publication number is 1154952A a kind of special auxiliary material for high-performance concrete, though this preparation scheme has produced certain technical effect with refining good raw material. However, the resources of high-calcium fly ash and silica fume as the main materials are small, so it is difficult to meet the needs of large-scale projects. According to the formula disclosed in the manual, 1 ton of auxiliary materials needs more than 1,000 yuan, which is expensive and affects a large number of powders. The conversion of coal ash is not conducive to the wide application. [000...

AI Technical Summary

Problems solved by technology

However, the resources of high-calcium fly ash and silica fume as the main materials are small, so it is difficult to meet the needs of large-scale projects. According to the formula disclosed in the manual, 1 ton of auxiliary materials needs more than 1,000 yuan, which is expensive and affects a large number of powders. The conversion of coal ash is not conducive to wide application

[0003] In the prior art, the use of fly ash is mostly to mix pure fly ash into concrete. This preparation method will bring serious problems of slow setting and low early strength to concrete, which will affect the construction quality.