A method for mixing ratio of machine-made sand self-compacting lightweight aggregate concrete

Abstract

The invention discloses a method for designing the mixing ratio of machine-made sand self-compacting lightweight aggregate concrete. The method includes: (1) determining the water-cement ratio according to the configuration strength, and determining the unilateral consumption of each raw material in the clean slurry in combination with the improved water consumption formula; 2) Determine the unilateral amount of lightweight aggregate and machine-made sand according to the value of primary slump expansion; convert the initial amount of each raw material into a preliminary benchmark mix ratio; (3) use the orthogonal test method to optimize the amount of each raw material to obtain the benchmark mix ratio (4) Convert the base mixing ratio to the production mixing ratio according to the raw material index. The present invention fully considers the characteristics of machine-made sand and lightweight aggregate, improves the water consumption formula, and proposes an additional water consumption correction factor for machine-made sand γ 2 , and give the value range. Pre-wet the lightweight aggregate with additional water, and add a large amount of fly ash and some silica fume and other mineral admixtures, which can effectively inhibit the floating of the lightweight aggregate and ensure the working performance of the machine-made sand self-compacting lightweight aggregate concrete and mechanical properties.

Description

technical field [0001] The invention relates to the field of civil engineering materials, in particular to a method for mixing ratio of machine-made sand self-compacting lightweight aggregate concrete. Background technique [0002] With the increasing development of engineering construction, natural sand resources in many areas of our country are gradually decreasing, which affects the progress of engineering construction. In addition, the disorderly exploitation of natural sand in some areas has seriously affected the ecology and environment. Therefore, the national and local governments have successively issued regulations and policies to strictly restrict or prohibit the exploitation of natural sand, further reducing the source of natural sand. Machine-made sand has good bonding with concrete, and its physical indicators are similar to natural sand, so it is a suitable substitute material for natural sand. At the same time, self-compacting lightweight aggregate concrete...

AI Technical Summary

Problems solved by technology

Therefore, the current self-compacting concrete mix design method cannot fully meet the requirements of the machine-made sand self-compacting lightweight aggregate concrete mix design method.

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