Abstract
Grouting technology is widely applied in the fields of geotechnical engineering in infrastructure. Loose sand and sandy soil are common poor soils in tunnel and foundation treatments. It is necessary to use superfine cement slurry grouting in the micro-cracks of soil. The different effectiveness of Portland cement slurry and superfine cement slurry in sandy soil by the laboratory grouting experiment method were presented in this paper. The grouting situations of superfine cement slurry injected into sand and sandy soil were explored. The investigated parameters were the dry density, wet density, moisture content, internal friction angle, and cohesion force. The results show that the consolidation effect of superfine cement is better than that of Portland cement due to the small size of superfine cement particles. The superfine cement can diffuse into the sand by infiltration, extrusion, and splitting. When the water–cement ratio of superfine cement slurry is less than 2:1 grouting into loose sand, the dry and wet density decrease with the increase in the water–cement ratio, while the moisture content and cohesive force gradually increase. When the water–cement ratio of superfine cement slurry is 1:1 grouting into loose sand and sandy soil, the dry density, wet density, and cohesive force of loose sand are larger than those of sandy soil. The results of the experiment may be relevant for engineering applications.
Highlights
Grouting is a common technology in geotechnical engineering in infrastructure
This article adopted the method of laboratory experiment and comparatively studied the grouting effect of Portland cement and superfine cement slurry grouting into loose sand and sandy soil
Superfine cement and Portland cement were used as grouting materials; sand and sandy soil mixed with 10% clay were used as injected soil
Summary
Grouting is a common technology in geotechnical engineering in infrastructure. The grouting slurry is injected into cracks in rock and soil, the slurry is cemented to the rock and soil by filling, permeation, compaction, and splitting, which improves the mechanical properties, stability, integrity, and strength of the rock and soil [1,2,3,4,5]. The grouting technique has been introduced into many countries and applied more and more widely It has been popularized in railway, highway, coal, geology, water and electricity, military and other industries and has infiltrated into underground engineering, including foundation reinforcement, grouting water plugging, backfill, sinking control, housing rectification, landslide prevention, deformation control, landslide treatment, water cut-off curtain, seepage treatment, dam foundation seepage prevention, seepage control, ancient building protection and crack repair, etc. For a soil layer with small particle size, the commonly used Portland cement slurry often cannot be grouted into the micro-cracks of soil, which cannot form an effective waterproof curtain. This article adopted the method of laboratory experiment and comparatively studied the grouting effect of Portland cement and superfine cement slurry grouting into loose sand and sandy soil. The grouting effect of superfine cement grouting the sand and sandy soil was explored, providing reference for the related engineering practice
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