胶囊型微生物自修复剂制备及其在水泥基材料后期裂缝修复中的应用

扫码查看

原文链接

国家科技期刊平台
NETL
NSTL
万方数据

中文摘要：采用锐孔法合成微胶囊负载微生物芽孢和甲酸钙,制得粒径均匀的胶囊型微生物自修复剂,研究了微胶囊水凝胶对芽孢的保护效果.将胶囊型微生物自修复剂加入到砂浆试件中制备出微生物自修复砂浆,研究了开裂龄期为28 d时微生物自修复砂浆裂缝的自修复效果,并对水泥基材料裂缝的自修复机理进行了详细探讨.研究结果表明:胶囊型微生物自修复剂会使砂浆试件早期的力学性能略有降低,但不会影响其后期的抗压强度和抗折强度;对于裂缝宽度为0.35～0.45 mm的试件,加入胶囊型微生物自修复剂后砂浆试件经28 d养护,裂缝的面积修复率高达98％,渗水系数下降两个数量级,并且砂浆试件裂缝区的修复产物主要是方解石CaCO3.微胶囊载体能够很好地保护微生物芽孢,提高水泥基材料后期裂缝的自修复效果,这为水泥基材料后期裂缝的修复提供了一种新的思路.

外文标题：Preparation of Capsule Microbial Self-healing Agent and Its Application in the Later Age Crack Repair of Cement-based Materials

外文摘要：Microcapsule was synthesized by the principle of the sharp hole method to load microbial spores and calcium formate.The capsule microbial self-healing agent with uniform particle size could be obtained,and the protective effect of hydrogel on spores was studied.The microbial self-healing mortar was prepared by adding the capsule microbial self-healing agent to the mortar specimen,and the self-healing effect of microbial self-healing mortar cracks was studied when the cracking age was 28 d.The self-healing mechanism of cement-based material cracks was discussed in detail.The experimental results showed that the capsule microbial self-healing agent could slightly reduce the early mechanical properties of mortar specimens,but could not affect the later age compressive strength and flexural strength.For the crack with a width of 0.35-0.45 mm,after 28 d,the area repair rate of mortar specimen adding capsule microbial self-healing agent was 98％,the water permeability coefficient was decreased by two orders of magnitude,and the healing products at the mortar crack mouth was mainly calcite CaCO3.Microcapsule carrier can protect microbial spores well and improve the self-healing effect of cement-based material later age cracks,which provides a new idea for cement-based material cracks in the later age.

外文关键词：

MicrocapsuleMicrobial sporesMicrobial self-healing agentLate cracksSelf-healing mechanism

作者：

周春煦、冯红春、周文正

展开 >

作者单位：

江苏航运职业技术学院船舶与海洋工程系,江苏南通 226010

长江勘测规划设计研究有限责任公司,湖北武汉 430010

东南大学土木工程学院,江苏南京 210096

关键词：

微胶囊微生物芽孢微生物自修复剂后期裂缝自修复机理

基金：

江苏省高职院校教师专业带头人高端研修(个人访学研修)项目南通市科技计划项目南通市科技计划项目江苏高校"青蓝工程"优秀青年骨干教师培养项目

项目编号：

2021GRGDYX007MSZ21096JCZ20221112020QLGC

出版年：

2024

DOI：

10.14136/j.cnki.issn1673-2812.2024.04.019

材料科学与工程学报

浙江大学

材料科学与工程学报

CSTPCD北大核心

影响因子：0.765

ISSN：1673-2812

年,卷(期)：2024.42(4)