棉花秸秆纤维水泥土在干湿循环下抗压强度变化研究

Study on the Compressive Strength Changes of Cotton Straw Fiber Cement Soil under Dry-wet Cycle

研究掺入棉花秸秆纤维的水泥土经过数次干湿循环后的抗压强度变化。对不同次数干湿循环后的纤维水泥土进行无侧限抗压实验研究,结果表明:(1)随着干湿循环次数的增加,纤维水泥土的抗压强度先升高后降低;(2)养护7 d后的试样进行干湿循环,其最高抗压强度要高于正常养护28 d后的抗压强度,说明水泥的水化作用在干湿循环过程中依然发挥着重要的作用;(3)干湿循环30次后纤维依然存在一定的加筋效果,可应用于一定期间内的工程支护体系。

The compressive strength of cement soil mixed with cotton straw fiber was studied after several drying and wetting cycles.The unconfined compression test of fiber reinforced cement soil after different times of dry wet cycles was carried out.The results show that:(1)with the increase of dry and wet cycles,the compressive strength of fiber cement soil increases first and then decreases.(2)The maximum compressive strength of the samples after 7 days of curing is higher than that of the samples after 28 days of normal curing,which indicates that the hydration of cement still plays an important role in the process of dry wet cycle.(3)After 30 times of dry and wet circulation,the fiber still has some reinforcement effect,which can be applied to the engineering support system in a certain period.