海水-冻融共同作用下透水混凝土性能损伤及寿命预测
Performance damage and life prediction of pervious concrete under seawater-freeze-thaw coupling
闫希雯 1王学志 1辛明 1贺晶晶2
作者信息
- 1. 辽宁工业大学 土木建筑工程学院,辽宁 锦州 121001
- 2. 中国电建集团西北勘测设计研究院有限公司,陕西 西安 710065
- 折叠
摘要
为提高海水-冻融共同作用下透水混凝土的性能,采用正交试验方法,研究海水-冻融共同作用下矿渣(GBFS)替代率、羟丙基甲基纤维素(HPMC)掺量和聚丙烯塑料钢纤维(PPTF)掺量对透水混凝土宏观性能和微观结构的影响,运用NSGM(1,N)模型预测透水混凝土在海水-冻融共同作用后的相对动弹性模量.研究结果表明:当GBFS替代率为 20％,HPMC和PPTF掺量分别为 0.15％、0.5％时,透水混凝土的抗海水-冻融侵蚀性能最佳;海水侵蚀产生的膨胀性物质会加快裂缝的延展,PPTF的支撑锚固作用能够抑制裂缝的产生和延伸;NSGM(1,N)模型预测精度的检验指标 a 在[-3,2)内,平均相对误差为 Ⅱ 级误差,可用于相对动弹性模量的长期预测.
Abstract
In order to solve the problem that pervious concrete used in northern coastal cities is susceptible to seawater-freeze-thaw co-action in winter,orthogonal tests were used to investigate the effects of slag(GBFS)substitution rate,hydroxypropylmethylcellulose(HPMC)admixture,and polypropylene imitation steel fiber(PPTF)admixture on macroscopic properties and microstructural changes of the pervious concrete blocks after seawater-freeze-thaw co-action for 25,50,and 75 times,and the NSGM(1,N)model was used to predict the relative dynamic elastic modulus of pervious concrete after seawater-freeze-thaw co-action.The NSGM(1,N)model was applied to predict the relative dynamic elastic modulus of permeable concrete after seawater-freeze-thaw.The results show that the permeable concrete has the best seawater-freeze-thaw resistance when the GBFS substitution ratess 20％and the HPMC and PPTF admixture are 0.15％and 0.5％,respectively;after seawater erosion,the generation of expansive substances accelerated the crack extension,and the supportive anchoring effect of PPTF suppressed the crack generation and extension.The test index a of the prediction accuracy of the NSGM(1,N)model is in[-3,2),and the average relative error is within the range of grade Ⅱ error.The NSGM(1,N)model can be used for long-term prediction of the relative dynamic elastic modulus.
关键词
矿渣/羟丙基甲基纤维素/聚丙烯仿钢纤维/透水混凝土/海水-冻融/NSGM(1,N)模型Key words
slag/hydroxypropyl methylcellulose(HPMC)/polypropylene plastic steel fiber(PPTF)/pervious concrete/sea water freeze-thaw/NSGM(1,N)model引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据