Bacterial carbonate precipitation improves the durability of cementitious materials
Bacterial carbonate precipitation improves the durability of cementitious materials
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DOI：
10.1016/j.cemconres.2008.03.005
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发表时间：
2008-07-01
影响因子：
11.4
通讯作者：
Verstraete, Willy
中科院分区：
文献类型：
--
作者：
De Muynck, Willem;Debrouwer, Dieter;Verstraete, Willy
传统的表面处理的缺点引起了人们对用于改善混凝土耐久性的替代技术的关注。本文报道了细菌碳酸盐沉淀（生物沉积）对不同孔隙率砂浆试件耐久性的影响。从渗透性能和对降解过程的抵抗力来评估耐用性。碳酸钙晶体的表面沉积使吸水率降低65%至90%，这取决于试样的孔隙率。结果，碳酸化速率和氯离子迁移分别降低约25-30%和10-40%。还注意到对冷冻和解冻的抵抗力增加。用生物沉积处理获得的结果与用常规表面处理获得的结果相似。(c)2008爱思唯尔有限公司保留所有权利。
Shortcomings of conventional surface treatments have drawn the attention to alternative techniques for the improvement of the durability of concrete. This paper reports the effects of bacterial carbonate precipitation (biodeposition) on the durability of mortar specimens with different porosity. Durability was assessed from the permeation properties and resistance towards degradation processes. The surface deposition of calcium carbonate crystals decreased the water absorption with 65 to 90% depending on the porosity of the specimens. As a consequence, the carbonation rate and chloride migration decreased by about 25-30% and 10-40% respectively. An increased resistance towards freezing and thawing was also noticed. The results obtained with the biodeposition treatment were similar as those obtained with conventional surface treatments. (c) 2008 Elsevier Ltd. All rights reserved.