Abstract
Through the measure of adding untreated wheat straw or rice straw to cement soil, the paper proposed a fundamental concept of cement soil with straw. From the perspectives of straw length, reinforcement ratio, straw shape, age of cement soil, and cement mixing ratio, the paper compared and analyzed both the unconfined compressive strength and the flexural strength between cement soil with wheat straw and cement soil with rice straw. The result shows that the strength of cement soil with wheat straw surpasses that of cement soil with rice straw. As straw length increases, the unconfined compressive strength of both the two kinds of cement soil tends to decrease in general; under the same circumstance, the flexural strength increases constantly for the cement soil with wheat straw, while decreases first and then increases for the cement soil with rice straw. As reinforcement ratio rises, the unconfined compressive strength of the cement soil with wheat straw edges down gradually, while the unconfined compressive strength of the cement soil with rice straw peaks at 0.2% of the reinforcement ratio; on the same condition, the flexural strength of both the two kinds of cement soil tends to decrease by and large. In terms of rice straw shape, rice straw in full circle tops the impact on the compressive strength of cement soil, followed by rice straw in semi-circle; and quadrant rice straw exerts the minimum influence on the compressive strength of cement soil. In contrast, wheat straw shape has a negligible effect on the compressive strength of cement soil. Neither age of cement soil nor cement mixing ratio has extra effect on cement soil with straws than on ordinary cement soil. Finally, the function mechanism of straw in cement soil was analyzed briefly in the paper.
