Bacterial carbonate precipitation improves water absorption of interlocking compressed earth block (ICEB)

Global Congress on Construction, Material and Structural Engineering 2017

材料科学;土木建筑工程

Zamer, M.M.^1 ; Irwan, J.M.^1 ; Othman, N.^2 ; Faisal, S.K.^1 ; Anneza, L.H.^1 ; Alshalif, A.F.^1 ; Teddy, T.^1

Jamilus Research Centre for Sustainable Construction (JRC), Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor

86400, Malaysia^1

Micro-Pollutant Research Centre (MPRC), Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor

86400, Malaysia^2

关键词: Alternative materials;    Calcite precipitation;    Carbonate precipitation;    Compressed earth blocks;    Engineering properties;    In-water absorption;    Partial replacement;    Water absorption properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/271/1/012061/pdf
DOI  :  10.1088/1757-899X/271/1/012061

来源: IOP

【 摘 要 】

Interlocking compressed earth blocks (ICEB) are soil based blocks that allows for mortarless construction. The addition of many alternative materials into interlocking block in order to improve the durability has been reported. However there are currently lack of report and evidence on the application of biocalcification or microbiologically induced calcite precipitation (MICP) in improving the engineering properties of ICEB. This paper evaluate the effect of UB in improving the water absorption properties of ICEB. This paper also provide the results on SEM analysis of addition of 1%, 3% and 5% UB in ICEB. The bacteria were added as partial replacement of limestone water in ICEB. The results showed the reduction of 14.72% with 5% UB on initial water absorption followed by the results for water absorption by 24-hour soaking which also indicates reduction of 14.68% with 5% UB on 28th days of testing compared to control specimen. It was expected that the reduction of water absorption was due to the plugging of pores by the bacterial calcite which prevent ingression of water in ICEB samples. Therefore this study hopes that the positive results from the UB as improving in water absorption of ICEB will lead to improve others ICEB properties and others construction materials.