Abstract
This study discussed the applicability of the calcite precipitation method to repair the concrete's crack. The grouting solution of Enzyme-Mediated Calcite Precipitation (EMCP) was modified by adding milk as a catalyst in calcite formation. Cracks in concrete samples were made when the concrete was 28 days with a width of 0.1-0.3 mm. The EMCP solution composed of urease, urea, CaCl2, and milk was injected into the cracked concrete sample, and its effect on permeability and compressive strength tests were evaluated. The result shows that the optimum composition of milk used in the formation of calcite had a concentration of 5 g/L with an initial preparation temperature of 70oC, which produced 26% higher than the initial EMCP solution. The mechanical test results show that the reduction of coefficient of permeability of 92.23% compared to the cracked sample and the improve strength up to 98.75% of the non-cracked sample were obtained by three circles injection. This study elucidated that milk utilization as a catalyst material in repairing cracks with the EMCP method is a potential method for crack-healing concrete.
Highlights
Concrete is a material that has strength and durability for construction [1]
Autogenous healing is a process that occurs in concrete due to a chemical reaction from the concrete matrix, while engineered healing is obtained by adding specific chemicals and microorganisms to the concrete mixture, such as the use of bacteria as a healing agent
CaCl2, urease with urease activity of 2950 U/g (020-83242, Kishida Chemical, Osaka, Japan), and the formula milk powder produced by Sarihusada, Yogyakarta, Indonesia, which was applied as the catalyst, were all used in the Enzyme-Mediated Calcite Precipitation (EMCP) solution
Summary
Concrete is a material that has strength and durability for construction [1]. concrete has a high potential for cracking and promotes shrinkage and deflection. According to Mihashi and Nishiwaki [4], self-healing concrete can be divided into two types, based on the repair mechanism, namely autogenous healing and engineered healing. Autogenous healing is a process that occurs in concrete due to a chemical reaction from the concrete matrix, while engineered healing is obtained by adding specific chemicals and microorganisms to the concrete mixture, such as the use of bacteria as a healing agent. This method was introduced as the self-healing concrete and a low-cost infrastructure solution, both in construction and maintenance [5]
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