摘要
混凝土结构构件容易发生开裂,裂缝的存在会影响其整体性和耐久性。以科氏芽孢杆菌为裂缝修复剂,以表面为开放孔的膨胀珍珠岩作为修复剂的载体,研制出一种基于微生物矿化沉积的裂缝自修复混凝土。为了保证该混凝土既具备良好裂缝自修复能力,又具有足够的基本力学性能,考察了膨胀珍珠岩载体(以下简称CEP)掺量对裂缝自修复混凝土抗压强度的影响,并考察了硅灰掺量对混凝土抗压强度的提高程度。试验结果表明,CEP掺量对裂缝自修复混凝土抗压强度影响显著,当CEP掺量占混凝土体积比为0~75%时,混凝土抗压强度随着CEP掺量的增加而降低;当掺量为75%时,混凝土抗压强度相比0掺量时降低了53%。随着硅灰掺量的增大,混凝土抗压强度呈增长趋势;硅灰的最优掺量为7%,相比0掺量时混凝土抗压强度增加了9.3%。
It is quite vulnerable to cracking for concrete structural members.The presence of cracks in concrete can adversely affect its integrity and durability.In this study, Bacillus cohniiand expanded perlite are used as self-healing agent and agent carrier respectively, and a new type of self-healing concrete is proposed.In order to ensure the proposed concrete possesses both sufficient mechanical properties and excellent crack capacity.The effect of expanded perlite proportion on compressive strength of self-healing concrete was investigated.The enhancement of compressive strength of concrete by silica fume was also studied.It shows thatexpanded perlite proportion significantly affected the compressive strength of self-healing concrete.When the volume percentage of CEP reached to 75%,the compressive strength of concrete reduced by 53% compared to concrete with CEP volume percentage of 0.Moreover,the compressive strength of concretegradually increased with the increase of silica fume proportion.The optimum proportion of silica fumewas 7%, and the compressive strength of concrete increased by 9.3% compared to concrete with silica fume proportion of 0.
作者
周梦君
张家广
李珠
冯涛
赵林
ZHOU Mengjun , ZHANG Jiaguang , LI Zhu , FENG Tao , ZHAO Lin(College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《混凝土》
CAS
北大核心
2018年第3期35-39,共5页
Concrete
基金
山西省科技攻关项目(20150313014-1)
中国博士后科学基金面上项目(2016M591416)
关键词
混凝土
裂缝自修复
微生物矿化沉积
抗压强度
膨胀珍珠岩
硅灰
concrete
crack-healing
microbial mineralization
compressive strength
expanded perlite
silica fume
作者简介
第一作者：周梦君（1993-），女，硕士研究生，主要从事结构工程方面研究。联系地址：山西省太原市万柏林区迎泽西大街79号太原理工大学（030024）联系电话：15735655001;通讯作者：李珠（1959-），男，博士，教授，博士生导师，主要研究方向为结构工程。联系电话：15534479666
