粉煤灰与稻草纤维复掺对混凝土力学性能的影响

Study on the Mechanical Properties of Fly Ash and Straw Fiber Composite Concrete

研究了丝状、杆状稻草纤维分别与粉煤灰复掺对混凝土力学性能的影响。结果表明:随着稻草纤维和粉煤灰掺量的增加,混凝土的抗压强度、劈裂抗拉强度和抗折强度总体呈下降趋势,但稻草纤维能够有效改善混凝土的脆性破坏形态;丝状稻草纤维对混凝土性能的不利影响小于杆状稻草纤维;当丝状稻草纤维掺量为0.3%、粉煤灰掺量为20%时,混凝土的抗压强度较高;当丝状稻草纤维掺量为0.3%、粉煤灰掺量为10%时,混凝土的劈裂抗拉强度较高;当丝状稻草纤维掺量为0.3%、粉煤灰掺量为20%时,混凝土的抗折强度较高。

The effects of filamentary straw fiber and rod-shaped straw fiber and fly ash on mechanical properties of concrete were studied.The results show that the compressive strength,splitting tensile strength and flexural strength of concrete generally decrease with the increase of straw fiber content and fly ash content,but straw fiber can effectively improve the brittle damage pattern of concrete.The adverse effect of filamentous straw fiber on the performance of concrete is less than that of rod-shaped straw fiber.The compressive strength of the concrete is higher when the filamentary straw fiber content is 0.3%and the fly ash content is 20%.The splitting tensile strength of the concrete is higher when the filamentary straw fiber content is 0.3%and the fly ash content is 10%.The flexural strength of the concrete is higher when the filamentary straw fiber content is 0.3%and the fly ash content is 20%.