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Elaboration of a Road Material Based on clayey Soil and Crushed sand

Fluid Dynamics & Materials Processing 2022年第6期18卷 1595-1605页

作者： H.G.R.Sekloka C.P.Yabi R.Cloots M.Gibigaye Group of Research in Energy and Environment from Materials(GREENMAT) LiègeBelgium Laboratory of Energetics and Applied Mechanics(LEMA) CotonouBenin Laboratory of Tests and Studies in Civil Engineering(L2EGC) AbomeyBenin

To contribute to the enhancement of unconventional local materials used for road construction,this study characterizes a crushed sand 0/5,a clayey soil and the litho-stabilized material without and with hydraulic binder and determines their use in accordance with some reference specifications(CEBTP 1984).It is shown that the different components are not usable alone in pavement base.Indeed,the plasticity index obtained for the clayey soil is 21%,a value higher than the imposed standards.In addition,the grading of the 0/5 crushed sand does not fit into the range proposed by CEBTP.A combination of these two(02)components is therefore considered to obtain a suitable material usable for the sub-base.This new material does not enter any class of the CEBTP lateritic soils.In order to be used in base layer,a treatment with hydraulic binder is carried out with the intention to improve its mechanical performances.The optimal dosage of hydraulic binder to achieve the desired mechanical performance is obtained by studying the evolution of the mechanical characteristics of the mixture.After this treatment,the Bearing Ratio index of the mix increases from 37 to 223 for the optimal dosage and the dry compaction density decreases from 2.11 to 2.06 g/cm3 while the optimal water content increases from 9%to 10.1%.

关键词： clayey sand crushed sand hydraulic binder road base

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Using fracture grouting to lift structures in clayey sand

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第11期11卷 879-886页

作者： James C. NI Wen-chieh CHENG Department of Civil Engineering National Taipei University of Technology College of Engineering National Taipei University of Technology

An inclined seven-story reinforced concrete building was leveled by a fracture grouting technique with quick-setting grout on a differential thickness of a clayey sand layer. The permeability and strength of clayey sand were controlled by clay content, although sand was the primary component of the foundation soil. The elevations of the building columns at basement level were closely monitored to record both the heaved volume of mat foundation after grouting and the settled volume during pore pressure dissipation. During the stabilizing stage of grouting, the foundation soil was densified by the repetitive fracturing process, which resulted in the lateral movement of the foundation soil. When the grout is less able to push soil laterally than upwards, the building starts to lift, the so-called lifting stage of grouting. The grouting efficiency is influenced by soil type, soil stress history, and foundation pressure. A final grouting efficiency of 27% and a linear relationship between grout use and percentage of eleva-tion were obtained when this building was successfully and permanently leveled.

关键词： Fracture grouting Gel time Mat foundation Grouting efficiency clayey sand

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