Abstract
This paper focuses the results of the improvement in shear strength parameters and CBR of soft clay when stabilized with cement and cement-Palm Kernel Shell Ash (PKSA). Different combinations of soil- cement and soil-cement-PKSA mixtures are prepared with the addition of cement and PKSA in the range of 2-10% by weight of soil. Series of tests including compaction, UCT, and CBR tests were performed. The influence of curing time is also studied on CBR and undrained strength property of various sample combinations. Results indicate that the addition of PKSA to the soil-cement mixtures increases the CBR. The percentage of optimum PKSA content in the mix for soil with 10% cement is 2%. The effect of time on clay, cement, and PKSA mixture is significant, i.e. an average of 0.5% per day.
Highlights
Soil stabilization is a method of altering soil behavior to improve its performance to be used in construction
UCT and California Bearing Ratio (CBR) tests were performed to the soil at the optimum moisture content condition
The optimum water content of 34,35% corresponding to the dry density of 1,23 gr/cm3 was obtained for the sample with zero cement amounts. These high optimum moisture content (OMC) and low dry density repeal that the soil consists of more clay that commonly has low shear strength
Summary
Soil stabilization is a method of altering soil behavior to improve its performance to be used in construction. Records from the literature show that cement is an effective stabilizer in the improvement of the strength properties coarse-grained soil [1], [2], [3], [4] and fine-grained soil [5], [6], [7]. Shear strength of cement stabilized soil is influenced by curing time depending on types of soils [8]. Addition of lime or fly ash may reduce the excess moisture content of soil before using cement [8]. Pozzolans are usually used as additives to Portland cement mixtures to increase the long-term strength and other material properties. This paper, focuses on analyzing the effect of the amount of cement, PKSA and the curing time on bearing capacity and the strength parameters of a soft soil through unconfined compression (UCT) and soaked California Bearing Ratio (CBR) tests
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