Abstract
Concrete is a material that has high compressive strength. However, concrete has a lower tensile strength than its compressive strength. As a result, the concrete often cracks and allows the entry of harmful substances such as dan causing corrosion of the reinforcement. Therefore, the repair method began to shift from the conventional way to the concept of self-healing concrete which involves the deposition of CaCO3. Precipitation can be done by the enzymatically – induced carbonate precipitation (EICP) method through a combination of urease, urea, and CaCl2 into a solution. This research used soybean extract as a substitute for pure urease enzyme. Variations in the concentration of soybean flour used as injection solution were variations in the content of soybean flour 15 g/L because it produced an optimum calcite mass of 2.62 grams. As a result, there was an increase in the compressive strength of BI against BR. In addition, there was a decreased value of permeability and porosity and the number of injections carried out. The increase in compressive strength, decrease in permeability, and decrease in porosity in concrete is due to CaCO3 deposition in the concrete which can cover the pores and cracks in the concrete.
Highlights
Concrete is a building material that has a high compressive strength [1]
Soybean powder has the potential to replace the urease enzyme when viewed from previous studies so that based on these considerations, this study aims to determine the effect of soybean powder as a substitute for urease on compressive strength, permeability, and porosity in cracked concrete
Based on the research that has been done, it can be concluded that: 1. Variations in soybean flour concentration of 15 g/L produced optimum calcite mass, which was used in calcite precipitation solution to be injected into concrete
Summary
Concrete is a building material that has a high compressive strength [1]. Cracks in the concrete structure cannot be avoided [2,3]. This matter can accelerate the corrosion of steel reinforcement and damage to the concrete, thereby shortening the life of the concrete [4]. Hazardous substances such as Cl and SO can enter through the cracks even if the damages are minor [5]. Cracks in concrete result in decreased strength and durability, and the cost of repairs is quite expensive. Even in the UK, maintenance, and repairs in the construction sector cost £40 billion [6]
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