摘要
结合武汉市某工程大体积混凝土实测温度,试验研究了高温高碱环境对纤维自身力学性能的影响,及不同养护温度下混凝土的力学性能发展趋势.试验结果表明:聚丙烯纤维在10%浓度的NaOH溶液中浸泡24 h且经历室温—65℃—室温循环,纤维自身力学性能下降约10%;处理后的纤维掺入混凝土中对标准养护的试块强度无不良影响;不同养护温度下纤维混凝土力学性能发展趋势差异明显,65℃养护1 d龄期的轴心抗压强度、弹性模量、劈裂抗拉强度可达标准养护28 d龄期相应参数的97%,74%,74%,4 d龄期轴心抗压强度、劈裂抗拉强度有一定增长趋势.因此,大体积混凝土实体结构强度评定需考虑水化温度作用的影响.
Through measured temperature of one project in Wuhan City, the effect of high temperature and high alkali environment on mechanical properties of fiber and development tendency of concrete mechanical properties under different curing temperature was stud- ied. The results showed that mechanicals of fiber decrease by 10% after polypropylene fibers immersed in 10% NaOH solution for 24 h cycling between 65 ℃and 25 ℃ ; fibers treated which were incorporated into concrete had no bad effect on strength of the specimen ; there was a big difference on development tendency of fiber concrete mechanical properties under different curing temperature. 1 d axial compressive strength, elastic modulus and splitting tensile strength could respectively reached 97% ,74% and 74% of 28 d correspond- ing parameters. Axial compressive strength increased slowly and splitting tensile strength increased a little after 4 d. So the effect of hy- dration temperature should be taken into consideration when assessing entity structure strength of the high-volume concrete.
出处
《华北水利水电学院学报》
2012年第6期10-13,共4页
North China Institute of Water Conservancy and Hydroelectric Power
关键词
监测曲线
高温高碱
聚丙烯纤维
水化温度
力学性能
monitoring curve
high temperature and high alkali
polypropylene fibers
hydration temperature
mechanical properties
