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Muhammad Rizki Harahap
Politeknik Negeri Medan
Religion Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Law, Crime, Criminology & Criminal Justice Social Sciences

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Studi Eksperimental Penggunaan Admixture Superplasticizer dalam Upaya Terhadap Peningkatan Kuat Tekan Beton Muhammad Rizki Harahap; Indra Jhon Fischer
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.3531

Abstract

Concrete is a composite material consisting of Portland cement, water, fine aggregate, coarse aggregate, and specific admixtures formulated in predetermined proportions to produce concrete of a quality that meets specified requirements. The use of admixtures is a common approach to improving the mechanical properties of concrete, particularly compressive strength. In this study, a superplasticizer admixture was applied to a K-175 grade concrete mix. An experimental approach was implemented through a series of tests at the materials laboratory of the Medan State Polytechnic. The study samples consisted of normal concrete and concrete with an admixture addition of 1.5% by weight of the cement. Compressive strength testing was conducted at 28 days of curing. The results showed that the normal concrete had an average compressive strength of 13.07 MPa, while the concrete with the superplasticizer admixture reached 16.13 MPa, representing an increase of approximately 23.41%. Thus, the use of the admixture was proven to increase the concrete’s compressive strength by 3.06 MPa compared to concrete without the additive.
Study of The Addition of Palm Shall Ash on Increasing Compressive Strength of Paving Block Muhammad Rizki Harahap
Jurnal Impresi Indonesia Vol. 4 No. 5 (2025): Jurnal Impresi Indonesia
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jii.v4i5.6627

Abstract

Increasing development, the demand for building materials such as paving blocks is also increasing. With the many variations offered, the material for making paving blocks is not just a mixture of cement and sand. Crushed stone or gravel or other additives can also be used. In this study, palm shell ash was chosen as an additional material in making paving blocks, in order to increase the compressive strength of the paving blocks. This study was conducted by making 48 test specimens, then testing the compressive strength after the test specimens were soaked according to the predetermined planned age. This study refers to the implementation method of SNI 03-0691-1996 concerning concrete bricks (paving blocks). To obtain the optimal composition, various palm shell ash was added. Compressive strength testing was carried out when the test specimens reached the planned age. The results of the compressive strength test that had been carried out, it was found that the optimal addition of palm shell ash occurred at an addition of 8% at a soaking age of 28 days. So by referring to the regulations, concrete bricks (paving blocks) are included in the class C/IIIa quality category.
Co-Authors Indra Jhon Fischer