微生物菌体对砂浆疏水性能的提升及机理分析  

Application of Microorganisms to Improve Hydrophobic Properties of Mortar and Its Mechanisms

作　　者：王剑云 柯懿耘 温建峰 崔凯 元强[4] WANG Jianyun;KE Yiyun;WEN Jianfeng;CUI Kai;YUAN Qiang(School of Human Settlements and Civil Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Anhui China Railway Engineering Materials Technology Co.Ltd,Hefei 230041,China;School of Chemical Engineering and Technology,Xi'an Jiaotong University,Xi'an 710049,China;School of Civil Engineering,Central South University,Changsha 410083,China)

机构地区：[1]西安交通大学人居环境与建筑工程学院,西安710049 [2]安徽中铁工程材料科技有限公司,合肥230041 [3]西安交通大学化学工程与技术学院,西安710049 [4]中南大学土木工程学院,长沙410083

出　　处：《硅酸盐学报》2023年第5期1165-1173,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金青年基金(51908459);陕西省自然科学基金面上基金(2020JM-040)。

摘　　要：水泥基材料具有高度的亲水性,服役环境中的侵蚀性物质往往通过水的传输渗透到水泥基材料中,从而导致钢筋腐蚀、混凝土碳化等耐久性问题.本工作利用具有疏水性的微生物菌体提高水泥基材料的疏水性能.研究发现熊蜂生假丝酵母和球形芽孢杆菌掺入砂浆后均可提高砂浆的疏水性能,接触角可分别提升至122.7°和112.1°,水滴在砂浆断裂面的扩散速率和吸收速率显著减缓,毛细吸水最高下降39%左右.通过对内部微结构的分析初步得出菌体通过粗糙结构的构造及自身疏水性的共同作用提升了砂浆基体的疏水性能.虽然加入菌体后砂浆的流动性能和疏水性能得到提升,然而力学性能显著下降,这也为后续使用微生物菌体作为水泥基材料疏水剂提出新的挑战.Cement-based materials are highly hydrophilic,and aggressive substances in service environment often penetrate into the cement-based materials through the transmission of water,resulting in corrosion of steel bars,carbonization of concrete,and other hazards.In this paper,two types of microbe cells were applied to improve the hydrophobic properties of the mortar specimens.The results show that the contact angle of the mortar specimens increases to 122.7°and 112.1°after the addition of Starmerella bombicola CCRC22302 and Bacillus sphaericus LMG22257,respectively.The diffusion rate and absorption rate of water on the fracture surface are obviously slowed down.The capillary water absorption is decreased by 39%in the groups added with 2.5%(in mass)Starmerella bombicola by mass of cement.The bacterial cell improves the hydrophobicity through the combined action of the rough structure and its hydrophobicity.However,it is indicated that the flexural and compressive strengths of the mortar specimens are significantly decreased,thus becoming a challenge for the practical application.

关 键 词：菌体 接触角 毛细吸水率 流动度 孔结构 

分 类 号：TU528[建筑科学—建筑技术科学]