弯曲荷载作用下钢纤维混凝土碳化性能

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英文篇名：Carbonation of steel fiber reinforced concrete under flexural loading 作者：王艳 ; 牛荻涛 ; 苗元耀 ; 关虓 英文作者：WANG Yan;NIU Ditao;MIAO Yuanyao;GUAN Xiao;School of Material & Mineral Resources,Xi'an Univ. of Arch. & Tech.;School of Civil Engineering,Xi'an Univ. of Arch. & Tech.; 关键词：钢纤维混凝土 ; 弯曲荷载 ; 碳化 ; 碳化弯曲应力影响系数 英文关键词：steel fiber reinforced concrete;;flexural loading;;carbonization;;flexural loading influence coefficient on carbonization. 中文刊名：XAJZ 英文刊名：Journal of Xi'an University of Architecture & Technology(Natural Science Edition) 机构：西安建筑科技大学材料与矿资学院;西安建筑科技大学土木工程学院; 出版日期：2015-02-28 出版单位：西安建筑科技大学学报(自然科学版) 年：2015 期：v.47;No.200 基金：国家自然科学基金青年科学基金项目(51308445);; 陕西省自然科学基金青年人才项目(2013JQ7033);; 陕西省教育厅专项科研计划项目(2013JK0972) 语种：中文; 页：XAJZ201501010 页数：5 CN：01 ISSN：61-1295/TU 分类号：55-59

摘要

实际情况中荷载会对混凝土的耐久性退化规律产生影响,通过开展弯曲荷载作用下钢纤维混凝土的快速碳化试验,研究钢纤维掺量以及应力状态、应力水平对钢纤维混凝土碳化深度的影响规律.结果显示:弯曲荷载对钢纤维混凝土的碳化深度产生了影响,钢纤维混凝土的碳化深度在弯曲拉应力作用下增大,并且随着拉应力水平的提高持续增大;一定水平的弯曲压应力对于钢纤维混凝土的碳化起到抑制作用.适量的钢纤维能够降低弯曲荷载对基体混凝土碳化深度的影响,但当纤维掺量较大时,这种降低效果不再明显.本次试验中,体积掺量为1.5%的钢纤维混凝土在各种应力状态下的碳化深度均为最小,并且受荷载水平的影响也最小.
        Loading can affect the degradation rule of concrete durability. Based on the accelerated carbonization test of steel fiber reinforced concrete under flexural loading, effects of steel fiber content, stress state on steel fiber reinforced concrete carbonation depth were studied. Test results indicated that the flexural tensile stress accelerate the concrete carbonation speed, while the flexural compressive stress under a certain level retard the concrete carbonation speed. Right amount of steel fiber helps reduce the influence of flexural loading on matrix concrete carbonation depth, but the reducing effect was not obvious. According to the varied mixing proportions in the test, steel fiber reinforced concrete of 1.5% volume content producted the best effect, and minimum carbonation depth in varied stress flexural loading.

引文

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