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Effect of fine particles on strength and stiffness of cement treated sand

机译：细颗粒对水泥砂强度和刚度的影响

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摘要

Naturally available sands are always found with finer particles of varying sizes and proportions which are generally not accounted for in the geotechnical design of a cemented soil system. This paper explores the behavior of cemented sand with fine particles in smaller proportions. Two types of cements: (1) ordinary portland cement (OPC), (2) calcium sulfoaluminate cement (CSA); three cement contents: 3%, 5%, 7% and four fine (kaolin powder) contents: 0%, 1%, 3%, 5% are considered in this study. The ultrasonic pulse velocity (UPV), shear wave velocity (Vs) and unconfined compressive strength (UCS) are measured to investigate the effects of fine particles on the cemented sand. The results show that fine particles do affect quite significantly the mechanical properties of cement-treated sand, even at negligent proportions. The strength and stiffness increase with fine content in both types of cement. The increase in strength and stiffness with increasing fine contents is attributed to the increased density with kaolin acting as a filler material facilitating more contact points among the particles. The results also show that the effect of fine particles on cemented sand depends not only on their relative volume and mineralogy but also on the type of the binding material.
机译：天然存在的沙子总是发现具有不同大小和比例的细颗粒，这在胶结土壤系统的岩土工程设计中通常没有考虑。本文探讨了较小比例的细颗粒胶结砂的行为。两种水泥：（1）普通硅酸盐水泥（OPC），（2）硫铝酸钙水泥（CSA）；本研究考虑了三种水泥含量：3％，5％，7％和四种细粉（高岭土粉）：0％，1％，3％，5％。测量超声波脉冲速度（UPV），剪切波速度（Vs）和无侧限抗压强度（UCS），以研究细颗粒对胶结砂的影响。结果表明，即使在疏忽的比例下，细颗粒也确实会显着影响水泥处理过的砂的机械性能。两种水泥中的含量均随强度的增加而增加。随着细粉含量的增加，强度和刚度的增加归因于高岭土作为填充材料的密度增加，从而促进了颗粒之间的更多接触点。结果还表明，细粒对胶结砂的影响不仅取决于它们的相对体积和矿物学，还取决于粘结材料的类型。

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