微细钢纤维磷酸镁水泥砂浆叠层修复板受弯性能试验研究

详细信息    查看全文 | 推荐本文 |

英文篇名：Experimental study on bending behavior of micro steel fiber magnesium phosphate cement mortar laminated restoration plate 作者：冯虎 ; 王振玉 ; 高丹盈 ; 赵军 ; 赵昆鹏 英文作者：Feng Hu;Wang Zhenyu;Gao Danying;Zhao Jun;Zhao Kunpeng;School of Civil Engineering, Zhengzhou University; 关键词：微细钢纤维 ; 磷酸镁水泥 ; 裂缝捕捉 ; 叠层 ; 受弯试验 英文关键词：micro steel fiber;;magnesium phosphate cement;;crack capture;;lamination;;bending experiment 中文刊名：JCJG 英文刊名：Building Structure 机构：郑州大学土木工程学院; 出版日期：2019-04-25 出版单位：建筑结构 年：2019 期：v.49;No.500 基金：国家自然科学基金(51308504);; 河南省科技攻关项目(152102310068);; 河南省高等学校青年骨干教师培养计划 语种：中文; 页：JCJG201908016 页数：5 CN：08 ISSN：11-2833/TU 分类号：108-112

摘要

采用磷酸镁水泥、普通硅酸盐水泥、快硬硫铝酸盐水泥和微细钢纤维制备叠层修复材料,通过叠层修复板的受弯试验,探索了叠层厚度、微细钢纤维体积掺量和水泥类型等对叠层修复板受弯性能的影响。结果表明:弯曲荷载作用下,普通混凝土叠层修复板的破坏形式为跨中折断的脆性破坏,微细钢纤维传统水泥(普通硅酸盐和快硬硫铝酸盐水泥)砂浆叠层修复板的破坏形式为跨中多裂缝的韧性破坏,而微细钢纤维磷酸镁水泥砂浆叠层修复板的破坏形式为分叉多裂缝的韧性破坏;相同叠层厚度下,微细钢纤维磷酸镁水泥砂浆叠层修复板的承载力更高,其韧性和变形适应能力更强,叠层修复效果更好;随微细钢纤维体积掺量增加,微细钢纤维磷酸镁水泥砂浆叠层修复板开裂荷载和峰值荷载均缓慢增加;随叠层厚度增加,微细钢纤维磷酸镁水泥砂浆叠层修复板的开裂荷载、峰值荷载及峰值荷载对应的跨中挠度均逐渐显著增加。
        Magnesium phosphate cement, ordinary Portland cement, fast-hardening sulphoaluminate cement and micro steel fibers were used to prepare laminated restoration materials. The effects of lamination thickness, volume fraction of micro steel fibers and type of cement on the flexural properties of laminated restoration plates were investigated by bending experiments. The results show that under bending load, the failure mode of common concrete laminated restoration plate is brittle fracture at mid-span. The failure mode of traditional micro steel fiber cement(ordinary Portland cement and fast-hardening sulphoaluminate cement) mortar laminated restoration plate is ductile failure at mid-span with multi-cracks, while the failure mode of micro steel fiber magnesium phosphate cement mortar laminated restoration plate is fracture toughness failure bifurcated with multi-crack. Under the same lamination thickness, the laminated restoration plate with micro steel fiber magnesium phosphate cement mortar has higher bearing capacity, stronger toughness and deformation adaptability, and better lamination restoration effect. With the increase of volume fraction of microsteel fibers, the cracking load and peak wad of the laminated restoration plate with micro steel fiber magnesium phosphate cement mortar increases slowly. With the increase of lamination thickness, the cracking load, peak load and mid-span deflection corresponding to peak load of micro steel fiber magnesium phosphate cement mortar laminated restoration plate increase gradually.

引文

[1] 2012年公路水路交通运输行业发展统计公报[R].北京:交通运输部综合规划司,2013.
    [2] 魏中华,翁剑成,郑柯.超载对百平公路水泥混凝土路面破坏的影响分析[J].北京工业大学学报,2005,31(1):47-51.
    [3] 唐寻,宋显宏,杨和礼.钢纤维混凝土修补机场破损道面的方法研究[J].混凝土,2008(4):111-114.
    [4] PARKER F JR,BARKER W R,GUNKEL R C,et al.Development of a structural design procedure for rigid airport pavements:TRGL-79-4 [R].Washington D.C.:U.S.Army Engineer Research and Development Center,1979:137-152.
    [5] YUE LI,CHEN BING.Factors that affect the properties of magnesium phosphate cement[J].Construction and Building Materials,2013(47):977-983.
    [6] YANG Q,ZHANG S,WU X.Deicer-scaling resistance of phosphate cement-based binder for rapid repair of concrete[J].Cement and Concrete Research,2002,32(1):165-168.
    [7] 赵军,冯虎,陈勇浩.微细钢纤维高强水泥砂浆板嵌入式加固梁受剪试验研究[J].结构工程师,2017,33(2):22-27.
    [8] 冯虎,赵昆鹏,周博文,等.微细钢纤维快硬高强混凝土弯曲性能试验[J].土木工程与管理,2017,34(2):22-27.
    [9] NISHIOKA TOSHIHISA,ZHOU ZHI DONG,YU JIA HUAN.Analysis of in-plane transonically propagating interface crack with a finite contact zone [J].International Journal of Fracture,2006,142(3-4):241-254.
    [10] 杨楠.磷酸镁水泥基材料粘结性能研究[D].长沙:湖南大学,2014.