Superfine clay-based foam light soil and preparation method thereof

Abstract

The invention discloses superfine clay-based foam light soil and a preparation method thereof. The superfine clay-based foam light soil is prepared from the following components in parts by weight: 230-330 parts of cement, 205-300 parts of hollow glass beads, 35-55 parts of metakaolin, 80-195 parts of superfine clay, 190-220 parts of water and 20-38 parts of a foaming agent. The compressive strength index of the prepared foam light soil meets the engineering requirements, meanwhile, the anti-seepage performance of the foam light soil is improved, and the preparation method is simple; due to the particle morphology, microstructure and charge characteristics of the clay mineral, the clay mineral has very strong adsorption capacity on additives and water and has great influence on the rheological property of the cement-based material, and most of the clay mineral is layered silicate with negative charges and is formed by interlayer electrostatic interaction; the superfine clay is added into the foam light soil slurry, so that the yield stress, the plastic viscosity and the apparent viscosity of the foam light soil slurry can be remarkably improved, the impermeability of the foam light soil slurry is improved, and the engineering use requirements are met.

Description

technical field [0001] The invention relates to the technical field of preparation of foamed lightweight soil, in particular to an ultra-fine clay-based foamed lightweight soil and a preparation method thereof. Background technique [0002] After the foamed light soil is fully mixed with cement-based cementitious materials, water, admixtures and additives in a specified proportion to form a slurry, the foaming agent is fully foamed with compressed air through the foaming system of the bubble machine to form foam, and the foam is formed. The foam and cement slurry are mixed evenly, and then through the pumping system of the foaming machine for cast-in-place construction or mold forming, a new type of lightweight filling material with a large number of closed pores formed by natural curing. [0003] Foamed lightweight soil has the characteristics of light weight, high fluidity and convenient construction. It is used to replace filling and can be widely used in soft foundation ...

AI Technical Summary

Problems solved by technology

[0003] Foam light soil has the characteristics of lightness, high fluidity and convenient construction. It can be used to replace filling soil. It can be widely used in soft foundation abutment back filling, road expansion, foundation pit filling, old road and bridgehead subgrade replacement It can also be used in the field of highway engineering such as underground large-span structures to reduce loads and fill cavities and narrow spaces, which has broad application prospects. Second, its waterproof performance is often difficult to meet the requirements, which also limits the application range of foam lightweight soil

[0004] Clay minerals can significantly increase the yield stress, plastic viscosity and apparent viscosity of cement-based slurry, while improving its thixotropy. Therefore, the present invention proposes a superfine clay-based foam light soil to solve the problem of traditional foam light soil resistance. The shortcomings of poor permeability and low compressive strength provide the necessary guarantee for engineering construction