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All Journal Indonesian Journal of Construction Engineering and Sustainable Development Composite: Journal of Civil Engineering
Mahendra, Andhika
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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PEMANFAATAN SERBUK CANGKANG KERANG SIMPINGSEBAGAI SUBSITUSI PASIR Aziz, Muhamad Rifqi; Aziz, Rifqi; Abdilla, Raihan; Rickianto, Rio; Yoladissa, Naviera; Herlina, Liana; Mahendra, Andhika
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol 7 No 2 (2024): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/10.25105/cesd.v7i2.21644

Abstract

The increase in the demand for concrete materials has triggered the mining of stone, which is a constituent material of concrete as sand, resulting in a decrease in the amount of natural resources available for concrete construction purposes. The composition of concrete consists of fine aggregate, coarse aggregate, cement, water, and additives. The use of scallop shell powder as a sand substitute encourages the utilization of local materials, and shows concern for the environment. This study aims to determine the comparison of the compressive strength value of normal concrete with the compressive strength value of concrete using scallop shell powder by 2.5%, 5%, 7.5% and 10% of the number of test specimens as many as 20 samples.The method used in this research uses experimental methods in the laboratory. The specimens used werecylinders with a diameter of 15 cm and a height of 30 cm. The planned concrete quality is f'c = 30 Mpa.The compressive strength of normal concrete is 16.7 MPa at the age of 28 days and the compressivestrength of shell concrete with a composition of 2.5%, 5%, 7.5%, and 10 produces a compressive strengthof 11.6 MPa; 14.7 MPa; 13.72 MPa, and 12.45 MPa at the age of 28 days. The results of the study indicate that the lower the proportion of shell powder, the higher the compressive strength value, but it cannot exceed the compressive strength value of normal concrete. 
The Effect of CFRP Flexural Reinforcement on Ductility, Stiffness, and Energy Dissipation of T-Beam Numerically Mahendra, Andhika; Muslikh, Muslikh
Composite: Journal of Civil Engineering Vol. 4 No. 2 (2025): December 2025
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/cjce.v4i2.16302

Abstract

Kerusakan struktur di Indonesia sering terjadi akibat bencana dan kurangnya perawatan. Perkuatan struktur diperlukan agar bangunan tetap berfungsi, salah satunya dengan CFRP (Carbon Fiber Reinforced Polymer) yang dikenal mampu meningkatkan kapasitas beban. Namun, CFRP dapat menurunkan daktilitas, membuat struktur menjadi lebih kaku dan getas, yang berisiko kegagalan struktur. Penelitian ini mengkaji pengaruh penguatan lentur CFRP pada balok T pasca retak menggunakan metode elemen hingga yang divalidasi dengan data eksperimen sebelumnya. Tiga variasi diuji: balok kontrol, balok dengan CFRP sepanjang bentang, dan CFRP setengah bentang. Hasil menunjukkan bahwa kekakuan dari simulasi lebih tinggi dari eksperimen dikarenakan keadaan ideal pada numerik sedangkan, studi eksperimental terjadi slip yang tidak bisa dijustifikasi. Perbedaan beban leleh dan beban maksimum kurang dari 5%, menunjukkan simulasi valid. Hasil pengujian dengan variasi panajang CFRP menunjukkan balok dengan penguatan penuh menunjukkan kinerja terbaik dengan peningkatan kapasitas beban dan disipasi energi.
Co-Authors Abdilla, Raihan Aziz, Muhamad Rifqi Aziz, Rifqi Liana Herlina Muslikh Muslikh Rickianto, Rio Yoladissa, Naviera