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All Journal RACIC : Rab Construction Research
Alvin Alfredo Bara
Universitas Nusa Cendana
Civil Engineering, Building, Construction & Architecture

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STUDI EKSPERIMENTAL KUAT TEKAN MORTAR EPOXY DENGAN KOMPOSISI CAMPURAN SENDIRI SEBAGAI MATERIAL PERBAIKAN BETON BONAVENTURA HARYANTO UMBU TAY; Faras Y. Alfarisy; Ryan Iskandar; Alvin Alfredo Bara
Racic : Rab Construction Research Vol. 11 No. 1 (2026): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v11i1.6617

Abstract

This study aims to evaluate the compressive strength performance of custom-mixed epoxy mortar as an alternative concrete repair material, compared to the ready-mix Sikafloor-81 Epocem. The epoxy mortar was composed of epoxy resin, cornice adhesive, and silica sand, with three epoxy ratios: 0.5, 0.7, and 1.0 by weight of cornice. Compressive strength tests were conducted at 7, 14, and 28 days. Results showed that RE 0.7 and RE 1.0 variants exceeded the 45 MPa target at 28 days, with the highest value reaching 53.80 MPa. In contrast, the Sikafloor-81 Epocem exhibited strength reduction over time. ANOVA confirmed statistically significant differences among the variants. Therefore, the custom epoxy mortar proved superior and feasible to be developed as a reliable solution for concrete repair applications
PENGARUH METODE PERAWATAN MORTAR BERBASIS SUSPENSI Bacillus subtilis TERHADAP KUAT TEKAN MORTAR Alvin Alfredo Bara; Remigildus Cornelis; Moses Kopong Tokan
Racic : Rab Construction Research Vol. 11 No. 1 (2026): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v11i1.7579

Abstract

This study aims to investigate the effect of curing methods based on Bacillus subtilis suspension on the compressive strength of cement mortar. The curing methods included immersion and wrapping using flannel cloth, non-woven geotextile, and plastic wrapping, with bacterial suspension concentrations of 3%, 6%, 9%, and 12%, and curing ages of 7, 14, 28, and 56 days. Compressive strength tests were conducted on control mortar and bacterial-treated mortar in accordance with standard testing procedures. The results indicate that mortars cured using Bacillus subtilis suspension exhibited higher compressive strength than the control mortar at all curing ages. The strength enhancement became more pronounced at 28 and 56 days, reaching a maximum value of 55.07 MPa for immersion curing, compared to 36.48 MPa for the control mortar. Wrapped curing methods also produced higher compressive strength values than the control, reaching 39.18 MPa, indicating effective moisture retention during the curing process. The variation in bacterial concentration showed an optimum trend, suggesting that compressive strength improvement does not increase proportionally with higher bacterial concentrations. Overall, the findings demonstrate that Bacillus subtilis–based curing methods significantly improve mortar compressive strength and have strong potential as an alternative, practical, and sustainable curing approach.
Co-Authors BONAVENTURA HARYANTO UMBU TAY Faras Y. Alfarisy Moses Kopong Tokan Remigildus Cornelis Ryan Iskandar