Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2014 Vol: 6 Issue: 7

Effect mechanism of admixture on the strength of cement consolidated soil

Abstract

Cement and all kinds of admixture have been used in the treatment engineering of soft soil foundation in coastal cities to improve soil strength and sustain the dem ands of engineering construction. In engineering pr actice, soil composition varies because of different origins and formation environments. Thus, cement consolidated soil likely exhibits different strength characteristics when di fferent admixtures are added. In this study, soft s oil obtained from Fuzhou, Zhuhai, and Yingkou was used as test sample s. Physical properties, soluble salt content, organ ic matter content, and other basic parameters of the soil wer e analyzed. Indoor tests were also performed to sim ulate the consolidating process of soft soil with different a dmixture. Uniaxial compressive test was also perfor med to measure mechanical index. The combined effects of cement hy dration reaction with different organic matter comp osition, granularmetric and water characteristics were consi dered to determine the effect mechanism of cement c onsolidated soil with different admixtures. Results showed that the soft soil of the three areas contained high am ounts of organic matter and soluble salt. The uniaxial compressive s trength increased when early-strength agent and wat er-reducing agent were used. However, the increased amplitude v aried with different early-strength agents. The opt imum effect was obtained when CaSO4 was added, and the sample w as inseparable with high amounts of fulvic acid and humic acid. The same additive agent resulted in uniaxial compressive strength with low moisture content and high clay content. Thus, the basic properties of soft soil an d its organic matter content should be considered i n selecting the optimum admixture during cement consolidation in en gineering.