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废弃秸秆灰渣改良膨胀土的体积变化特征研究
引用本文:张德恒.废弃秸秆灰渣改良膨胀土的体积变化特征研究[J].南京工程学院学报(自然科学版),2014(2):39-44.
作者姓名:张德恒
作者单位:南京工程学院建筑工程学院,江苏南京211167
基金项目:南京工程学院科研基金项目(QKJB2011012)
摘    要:为提高资源的循环利用,减少农业废弃物对环境的潜在影响,利用秸秆灰渣作为添加剂改良膨胀土,通过室内试验研究改良后膨胀土的基本工程性质指标、三维自由体变化特征和膨胀压力特征。秸秆灰渣以(干质量之比)0%,10%,15%,20%的比例与膨胀土混合后进行击实试验,在最大干密度及最佳含水率条件下进行三维自由体膨胀试验、三维自由体收缩试验和膨胀力试验。试验结果表明膨胀土的体应变、塑性指标和膨胀压力随着秸秆灰渣含量的增加而逐渐降低,最佳含量(17%)时体膨胀应变降低了61.2%,体收缩应变降低了61.77%,膨胀压力降低了85.37%。

关 键 词:膨胀土  秸秆灰渣  三维自由体膨胀  三维自由体收缩  膨胀压力

Research into the Volume Change Characteristics of Expansive Soils Improved with Waste Straw Ash
ZHANG De-heng.Research into the Volume Change Characteristics of Expansive Soils Improved with Waste Straw Ash[J].Journal of Nanjing Institute of Technology :Natural Science Edition,2014(2):39-44.
Authors:ZHANG De-heng
Institution:ZHANG De-heng (School of Civil Engineering, Nanjing Institute of Technology, Nanjing 211167, China).
Abstract:In order to better recycle resources and reduce the likely impacts of agricultural wastes on the environment, expansive soils are improved by using additives which are obtained from straw ash by laboratory tests. This paper studies the basic engineering property index, three-dimensional free volume change characteristics and swelling pressure characteristics of the improved expansive soils. Straw ash is mixed with expansive soils, the ratios of which are 0 %, 10 %, 15 % and 20 %, and then compacted. Three-dimensional free volumetric swelling test, three-dimensional free volumetric strain test, and swelling pressure test are conducted on the mixture under the conditions of maximum dry density and optimum moisture content. The results show that the volume strain, plasticity index and swelling pressure decrease with the increase of ash content. When the optimum content of straw ash reaches 17 % of the total weight, the volumetric swelling, the volumetric strain, and the swelling pressure will decrease by 61.2 %, 61.77 %, and 85.37 % respectively.
Keywords:expansive soils  straw ash  three-dimensional free volumetric swelling  three-dimensional free volumetric strain  swelling pressure
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