Civil Engineering and Architecture Vol. 9(7), pp. 2317 - 2325
DOI: 10.13189/cea.2021.090719
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Potentially of Soybean as Bio-Catalyst in Calcite Precipitation Methods for Improving the Strength of Sandy Soil

Luthfi Lofianda ¹, Heriansyah Putra ^1,*, Erizal ¹, Sutoyo ¹, Hideaki Yasuhara ^2
1 Department of Civil and Environmental Engineering, IPB University, Bogor, Indonesia
² Department of Civil and Environmental Engineering, Ehime University, Matsuyama, Japan

ABSTRACT

The biocementation-based soil improvement technique that has been recently developed is enzyme-induced calcite precipitation (EICP). Previous studies on the EICP technique used pure commercial urease enzyme as a reaction catalyst to precipitate calcite from urea and calcium chloride. However, pure commercial urease enzyme is inefficient for application on a large scale due to its high price. Therefore, studies reported that soybean is a potential alternative for pure commercial urease enzymes. This study evaluates the strength of sandy soil by treatment using EICP grouting solution with soybean extracts as the bio-catalyst. The extracts used in this study were obtained by filtration and centrifugation treatment. Based on the calcite mass quantification and precipitation ratio, 20 g/L soybean extract concentration in both treatments is used for treating the solution. Then, the unconfined compressive strength (UCS) tests were conducted to evaluate the increase of the strength of sandy soil. The maximum UCS value was obtained at the 28 days of curing time in both treatments. The centrifugation treatment has a higher UCS value with 65.6 kPa than the filtration treatment with 53.6 kPa. Thus, this study elucidated that soybean extract has a great potential to be a bio-catalyst in the calcite precipitation method.

KEYWORDS
Calcite Precipitation, Soybean Powder, Sandy Soil, UCS, Filtration, Centrifugation

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Luthfi Lofianda , Heriansyah Putra , Erizal , Sutoyo , Hideaki Yasuhara , "Potentially of Soybean as Bio-Catalyst in Calcite Precipitation Methods for Improving the Strength of Sandy Soil," Civil Engineering and Architecture, Vol. 9, No. 7, pp. 2317 - 2325, 2021. DOI: 10.13189/cea.2021.090719.

(b). APA Format:
Luthfi Lofianda , Heriansyah Putra , Erizal , Sutoyo , Hideaki Yasuhara (2021). Potentially of Soybean as Bio-Catalyst in Calcite Precipitation Methods for Improving the Strength of Sandy Soil. Civil Engineering and Architecture, 9(7), 2317 - 2325. DOI: 10.13189/cea.2021.090719.