High-moisture content soft soil consolidating agent and application thereof

Abstract

The invention discloses a high-moisture content soft soil consolidating agent and application thereof. The high-moisture content soft soil consolidating agent is composed of an expanding component anda gelatinizing component, wherein the expanding component is composed of sulphoaluminate cement clinker, gypsum and lime, and the gelatinizing component is ordinary Portland cement; the weight ratioof the expanding component and the gelatinizing component is 0-100:100-0, and the weight ratio of the sulphoaluminate cement clinker, the gypsum and the lime of the expanding component is 40-60:32-48:8-12. The high-moisture content soft soil consolidating agent can be applied to consolidating muddy soil, sandy soil or silty soil with a moisture content as high as 50-150%; the construction processof the high-moisture content soft soil consolidating agent comprises construction methods of deep mixed piles, high-pressure jet grouting piles of a double-slurry grouting system. The high-moisture content soft soil consolidating agent solves coordination of production amount and speed of ettringite and C-S-H (calcium silicate hydrate) gel, makes full use of water absorbency of the expanding component, pore filling of the ettringite and bonding effects of compaction clay and the C-S-H gel.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a soft soil curing agent, in particular to a high water content soft soil curing agent and its application. Background technique [0002] Soft soil generally refers to saturated soft cohesive soil deposited in still water or slow water flow environment. Common types of soft soil include silt, muddy soil, soft cohesive soil, peat, peaty soil, etc. Soft soil has engineering characteristics such as high water content, large void ratio, low strength, high compressibility, low permeability coefficient, high sensitivity, structure, high salinity, high organic matter, etc., and is often in a flow plastic or soft plastic state. [0003] The water content of soft soil with high water content is greater than the liquid limit and the void ratio is greater than or equal to 1.0. Most of the water exists between soil particles in the form of free water, which keeps the friction betwee...

AI Technical Summary

Problems solved by technology

However, the following two problems may occur if the design and use of the curing agent are improper: one is that when the moisture content of the soft soil is low, the free water is relatively small, and after the early ettringite hydration reaction begins, the strength of the solidified soil increases significantly and compresses The performance is obviously reduced, and the expansion stress of the later-generated ettringite not only fails to fill the pores and compact the soft soil, but will cause the previously solidified soil to crack and reduce its strength, indicating that the pure ettringite curing agent does not It is suitable for soft soil with low moisture content; the second is that when the hydration product contains both ettringite and C-S-H gel, the expansive ettringite formed later may destroy the previously formed C-S-H gel, causing the solidified soil to expand and crack. The strength decreases, indicating that the coordination of the formation amount and formation speed of ettringite and C-S-H gel is very important

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