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首页> 外文期刊>Road materials and pavement design >Laboratory investigation of the strength, stiffness, and thermal conductivity of fly ash and lime kiln dust stabilised clay subgrade materials
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Laboratory investigation of the strength, stiffness, and thermal conductivity of fly ash and lime kiln dust stabilised clay subgrade materials

机译：粉煤灰和石灰窑粉尘稳定粘土路基材料的强度，刚度和导热系数的实验室研究

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摘要

The effectiveness of Class-C fly ash (FA) (ASTM C-618) and lime kiln dust (LKD) used in clay pavement base materials stabilisation has been investigated in this research. Proctor compaction test, unconfined compression test, and non-destructive test (Briaud compaction device (BCD) modulus and thermal conductivity) were carried out on the chemically modified soil. Test specimens were reconstituted by static compaction, constructed at optimum water content, and tested at various curing periods. Test results revealed that the addition of Class-C FA up to 20wt% could effectively increase the dry unit weight from 16.8 to 17.4kN/m(3) (105.0 to 108.3pcf), improve the unconfined compressive strength (UCS, which increased from 181.2 to 497.2kPa at the end of 28 days of curing), and raise the BCD modulus up to 40MPa. The LKD was also found to be a good stabiliser for weak soil, which could raise the UCS and stiffness under relatively small mixing rations (4 and 8wt%), but the dry unit weight decreased as the LKD mixing ratio increased. The thermal conductivity, however, decreased as the curing time and stabiliser mixing ratio increased. Parallel and series models were employed to understand the upper-and-lower bound of the mixtures' thermal conductivity. A thermal strength coupled empirical model which is based on the non-destructive testing results was developed to predict the UCS gain over curing time. The thermal conductivity and BCD modulus were also incorporated into a novel compaction quality check model. Based on the observed test data and regression analysis, both models were found to yield good results, indicating that they are robust tools for predicting the UCS and dry unit weight of chemically treated pavement base materials.
机译：本研究研究了C级粉煤灰（FA）（ASTM C-618）和石灰窑粉尘（LKD）在粘土路面基础材料稳定化中的有效性。在化学改性的土壤上进行了Proctor压实试验，无边压缩试验和无损试验（Briaud压实装置（BCD）模量和导热率）。通过静态压实法重构试样，以最佳含水量构造试样，并在不同的固化时间进行测试。测试结果表明，添加高达20wt％的C类FA可以有效地将干燥单位重量从16.8kN / m（3）（105.0增至108.3pcf），提高无侧限抗压强度（UCS，从在固化28天后达到181.2至497.2kPa），并将BCD模量提高到40MPa。还发现LKD是弱土壤的良好稳定剂，在相对较小的混合比（4和8wt％）下，它可以提高UCS和刚度，但是随着LKD混合比的增加，干重降低。然而，随着固化时间和稳定剂混合比的增加，热导率降低。使用并行和串联模型来了解混合物的导热系数的上下边界。建立了基于非破坏性测试结果的热强度耦合经验模型，以预测随着固化时间的UCS增益。导热系数和BCD模量也纳入了新型压实质量检查模型。根据观察到的测试数据和回归分析，发现这两个模型均产生了良好的结果，表明它们是预测化学处理过的路面基础材料的UCS和干重的可靠工具。

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