聚丙烯纤维增强泡沫轻质混凝土力学性能试验研究

发布时间：2018-03-29 23:18

本文选题：工程材料　切入点：力学性能　出处：《铁道建筑》2017年02期

【摘要】：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。
[Abstract]:The compressive strength test, splitting tensile strength test and flexural strength test of polypropylene fiber with different amount of polypropylene fiber were carried out for the light foamed concrete with a density of 700 kg/m3 mixed with 6 kinds of polypropylene fibers of different lengths. The effect of polypropylene fiber on the mechanical properties of foamed lightweight concrete is studied. The results show that the compressive strength, elastic modulus and splitting tensile strength of foamed lightweight concrete can be obtained when the fiber length is 3 ~ 6 ~ 9 ~ (12) mm. The compressive strength, elastic modulus, splitting tensile strength, flexural strength and flexural strength of the fiber increased slightly compared with the reference value when the fiber length was 1519 mm and the content was less than 0.2 mm, and when the fiber length was 15 ~ 19 mm, the flexural strength was slightly higher than that of the reference value, and when the fiber content was less than 0.2 mm, the flexural strength was slightly higher than that of the reference value. When the fiber length is 6 mm and the content of fiber is 0.6, the unconfined compressive strength, splitting tensile strength and flexural strength of foamed lightweight concrete can reach the maximum.
【作者单位】：西南交通大学土木工程学院;西南交通大学陆地交通地质灾害防治技术国家工程实验室;西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：中央高校基本科研业务费专项资金(2682014BR048) 中国铁路总公司科技研究开发计划(2015G002-K) 四川省科技计划(2016JY0005)
【分类号】：TU528.2

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