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Factors influencing accuracy of free swelling ratio of expansive soil

Journal of Central South University 2022年第5期29卷 1653-1662页

作者： WANG Liang-liang WANG Zhao-teng DING Zhi-ping LIN Yu-liang LEI Xiao-qin LIU Zhi-jun School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Xuzhou Design Institute China Railway Shanghai Design Institute Group Co.Ltd.Xuzhou 221000China School of Civil Engineering Central South UniversityChangsha 410075China Key Lab Mt Hazards&Earth Surface Proc Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China

Many geotechnical structures,such as the subgrade of high-speed railway,are extremely sensitive to micro *** one of the most commonly used indexes in China to evaluate the potential swelling level of expansive soils,the effectiveness and accuracy of free swelling ratio should be highly ***,due to the deficiency of geotechnical test regulations for the free swelling ratio test,non-negligible variation difference is often observed among the test results of the same type of soil ***,a series of laboratory tests are conducted to figure out the influences of soil particle size,initial soil temperature,and wet-dry circulation on the free swelling ratio of expansive *** results show that the initial soil temperature exerts an obvious influence on free swelling ratio and a relative weak influence on soil mass of expansive soil with the micro soil particle size(dfree swelling ratio and soil mass in the soil measuring cup regardless of initial soil ***,the enlarging amplitude decreases as the particle size of expansive soils *** is a progressive enlargement of free swelling ratio at the first two wet-dry cycles and then it attenuates gradually when the number of wetdry cycles further increases.

关键词： free swelling ratio particle size soil temperature wet-dry circulation expansive soil

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Research on physical and chemical properties and soundness of dry desulphurized fly ash used as a construction material

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Baosteel Technical Research 2013年第1期7卷 59-64页

作者： GU Wenfei TANG Oujing KANG Ming ZHOU Wei Baosteel Developing Co. Ltd.

The physical and chemical properties and soundness of Baosteel Power Plant＇ s dry desulphurized fly ash were systematically investigated and compared with those of the similar byproducts produced by some other domestic power plants. The feasibility of these byproducts used as a construction material was also analyzed. The results show that Baosteel＇s dry desulphurized fly ash is a kind of ash with high calcium and high sulfur contents, which has the characteristics of volcanic ash activity. It contains sulfate and sulfite, and is easy to cause sulfate activation. It has higher activity compared with common fly ash. But higher calcium sulfite and free-CaO contents in ash will bring about soundness concerns to users. Therefore, quality tests and volume control will be necessary when fly ash is used as a construction material.

关键词： dry desulfurized fly ash calcium sulfite activity soundness free swelling ratio

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