聚丙烯纤维增强泡沫轻质混凝土力学性能试验研究

Experimental Study on Mechanical Performance of Foamed Light Concrete Reinforced by Polypropylene Fiber

针对浇筑密度700 kg/m3的泡沫轻质混凝土掺加6种长度(3,6,9,12,15,19 mm)、不同掺量的聚丙烯纤维,开展抗压强度试验、劈裂抗拉强度试验和抗折强度试验,研究聚丙烯纤维对泡沫轻质混凝土力学性能的影响。结果表明:当纤维长度为3,6,9,12 mm时,泡沫轻质混凝土的抗压强度、弹性模量、劈裂抗拉强度、抗折强度均随着纤维掺量的增加先增大后减小;当纤维长度为15,19 mm,掺量≤0.2%时,其抗压强度、弹性模量、劈裂抗拉强度、抗折强度与基准值相比稍微增加,掺量>0.2%时,各参数随着纤维掺量的增加而减小;纤维长度6 mm、掺量为0.6%时泡沫轻质混凝土的无侧限抗压强度、劈裂抗拉强度与抗折强度达到最大值。

According to foamed light concrete with the pouring density of 700 kg/m^3 which was mixed with polypropylene fiber of six different length that are 3,6,9,12,15 mm and 19 mm and different fiber contents,the compressive strength test,splitting tensile strength test and flexural strength test were carried out to study the effect of polypropylene fiber on mechanical performance of foamed light concrete.The results show that the compressive strength,elastic modulus,splitting tensile strength and flexural strength of foamed light concrete first increases and then decreases with the increase of fiber content when the fiber length is 3,6,9 mm and 12 mm,the compressive strength,elastic modulus,splitting tensile strength and flexural strength has a slight increase compared with the reference value when the fiber length is 15 mm,19 mm and the fiber content is less than 0.2%,each parameter decreases with the fiber content increasing,and the unconfined compressive strength,splitting tensile strength and flexural strength reaches a maximum when the fiber length is 6 mm and the fiber content is 0.6%.