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All Journal RACIC : Rab Construction Research
Ayu Sinta Aprilia
Institut Teknologi Sumatera
Civil Engineering, Building, Construction & Architecture

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STUDI PARAMETRIK PERKUATAN GALIAN DALAM PADA TANAH LEMPUNG MENGGUNAKAN DINDING DIAFRAGMA DAN SECANT PILE Ayu Sinta Aprilia; Rahmat Kurniawan; Syahidus Syuhada; Try Lestari Sihotang; Ahmad Auliadi Yufrizal; Puspa Ningrum
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.v11i1.7694

Abstract

The selection of deep excavation retaining systems in Indonesian clay soils is commonly performed based on practical experience without systematic parametric guidance. This study develops selection criteria between diaphragm walls and secant piles through a comprehensive parametric study using the finite element method. A total of 216 numerical models were simulated using Optum G2 software, varying wall type (diaphragm wall and secant pile), excavation depth (4, 8, and 12 m), groundwater table position, building surcharge load (25 kN/m), soil type (soft clay with N-SPT = 4 and stiff clay with N-SPT = 15), and constitutive model (Mohr-Coulomb and Hardening Soil). Results demonstrate that the Hardening Soil model produces 30–39% lower deformations compared to Mohr-Coulomb. Secant piles proved more cost-efficient across all 216 scenarios analyzed, achieving up to 50% cost savings for shallow excavations under low-risk conditions. The most influential parameters on wall performance are, in order: soil type, excavation depth, groundwater table position, constitutive model, surcharge load, and wall type. The resulting design charts and decision matrices serve as preliminary design tools within the SNI 8460-2017 framework.
PENGARUH VARIASI KADAR SERAT BAJA TERHADAP WORKABILITY DAN KARAKTERISTIK MEKANIK BETON FC' 30 MPA Siska Apriwelni; Kirtinanda P; Ayu Sinta Aprilia; Anggarani Budi Ribowo; Kevin Chandra Nurwadji; Fadillah Anisa Pandia
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.v11i1.8116

Abstract

This study analyzes the effect of steel fiber addition on the workability, compressive strength, and split tensile strength of f’c 30 MPa concrete. Steel fiber contents of 0%, 5%, and 7% by total weight of concrete mix materials (equivalent to 0, ±112.4, and ±157.4 kg/m³, respectively) were investigated. Thirty-six cylindrical specimens (Ø15 cm × 30 cm) were tested at 7 and 28 days per SNI 7656:2012. Steel fiber addition significantly reduced slump values (7.5, 5.0, and 3.0 cm), decreased 28-day compressive strength from 31.97 MPa to 26.79 MPa (5%) and 23.39 MPa (7%), and increased split tensile strength from 2.45 MPa to 4.29 MPa (5%) and 4.20 MPa (7%). One-way ANOVA confirmed significant differences among variations (compressive strength: F = 34.86 > Fₜₐₕₑ = 5.14, α = 0.05; split tensile strength: F = 12.97 > Fₜₐₕₑ = 5.14, α = 0.05). The 5% steel fiber variation proved most effective, delivering the highest tensile strength improvement while maintaining acceptable workability.
Co-Authors Ahmad Auliadi Yufrizal Anggarani Budi Ribowo Apriwelni, Siska Fadillah Anisa Pandia Kevin Chandra Nurwadji Kirtinanda P Puspa Ningrum Rahmat Kurniawan Syahidus Syuhada Try Lestari Sihotang