Effects of hydrogel-encapsulated bacteria on the healing efficiency and compressive strength of concrete

作     者：Ricardo Hungria Marwa M.Hassan Momen Mousa Ricardo Hungria;Marwa M.Hassan;Momen Mousa

作者机构：Bert S.Turner Department of Construction ManagementLouisiana State UniversityBaton RougeLA 70803USA Department of Engineering TechnologySam Houston State UniversityHuntsvilleTX 77341USA 

出 版 物：《Journal of Road Engineering》 (道路工程学报（英文）)

年 卷 期：2023年第3卷第2期

页      面：156-170页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The financial support of the Transportation Consortium of SouthCentral States(Tran-SET)is greatly appreciated(Tran-SET Project 20CLSU05 Grant Number 69A3551747106) 

主　　题：Self-healing concrete Bioconcrete Microbial induced calcium carbonate precipitation Precursor 

摘      要：Microbial-induced calcium carbonate precipitation is a promising technology for self-healing concrete due to its capability to seal *** main goal of this study was to evaluate the effects of adding hydrogelencapsulated bacteria on the compressive strength and the self-healing efficiency of *** achieve this objective,12 sets of mortar samples were prepared,including three different mineral precursors(magnesium acetate,calcium lactate,and sodium lactate),at two concentrations(67.76 and 75.00 mM/L),and under two different biological conditions(with and without bacteria).In addition,a set of plain mortar samples was prepared to serve as a *** each sample set,three mortar cubes and three beams were prepared and subjected to compression and flexural strength *** the compression tests,it was found that the sample containing calcium lactate along with yeast extract and bacteria displayed the best *** for the flexural tests,once cracked,the beams were subjected to 28 d of wet/dry cycles(16 h of water immersion and 8 h of drying),where the bottom crack width was monitored(at 0,3,7,14,28 d of wet/dry cycles).Once the sample with the highest healing efficiency was identified(the one containing calcium lactate and hydrogel-encapsulated bacteria),the study was scaled up to concrete *** sets of concrete cylinders(consisting of three control samples and three samples with bacteria along with calcium lactate)were tested under compression in order to evaluate the effect of the bacteria-precursor combination on the concrete mechanical *** samples that yielded the greatest compressive strength were the ones containing calcium lactate and bacteria,displaying an improvement of 17%as compared to the control ***,a flexural strength recovery analysis was performed on the concrete specimens revealing that the control showed better flexural strength recovery than the bacteriacontaining variant(41.5%vs.26.1%)after