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Shear strength of clayey sand treated by nanoclay mixed with recycled polyester fiber

Journal of Central South University 2022年第1期29卷 259-269页

作者： Mehrdad KHOLGHIFARD Babak AMINI BEHBAHANI Department of Civil Engineering Yasooj BranchIslamic Azad UniversityYasooj ***Iran

The main objective of this study is to investigate the effects of the nanoclay mixed with recycled polyester fiber on the mechanical behavior of soil as a new stabilizer *** meet this objective,a series of drained direct shear and compaction tests were performed on unreinforced and reinforced soil specimens with three different combinations of the fiber-soil ratios ranging between 0.1%and 0.5%,as well as three different combinations of nanoclay soil ratios ranging between 0.5%and 1.5%of the soil dry *** indicated that composition of the nanoclay recycled polyester fiber with the soil improved the friction angle(Φ)by 41%and cohesion(c)by 174%.The soil particles stick together through viscose gel produced by *** addition,the rough and wavy surface of the fibers creates a bond and friction between the soil particles and prevents the movement of soil particles,and as a result,the soil strength is increased.

关键词： soil treatment nanoclay recycled polyester fiber shear strength clayey sand

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

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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 ***,the plasticity index obtained for the clayey soil is 21%,a value higher than the imposed *** 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 *** new material does not enter any class of the CEBTP lateritic *** order to be used in base layer,a treatment with hydraulic binder is carried out with the intention to improve its mechanical *** optimal dosage of hydraulic binder to achieve the desired mechanical performance is obtained by studying the evolution of the mechanical characteristics of the *** 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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