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Muhtarom Riyadi
Politeknik Negeri Jakarta
Civil Engineering, Building, Construction & Architecture

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PEMANFAATAN STYROFOAM SEBAGAI PENGGANTI SEBAGIAN AGREGAT HALUS PADA BETON DENGAN FAS 0.4 Danindra Pramudya Wardana; Gilang Fadhlurrahman Evriantama; Muhtarom Riyadi
Construction and Material Journal Vol. 3 No. 1 (2021): Construction and Material Journal Vol. 3 No. 1 Maret 2021
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v3i1.3731

Abstract

Concrete is a material commonly used for structural work. However, concrete has one disadvantage, namely that its specific gravity is high enough so that the dead load on a structure becomes large. One way to deal with high concrete density is to use Styrofoam waste as a substitute for some of the fine aggregate. This research was conducted to examine the physical and mechanical properties as well as the optimum value of compressive strength, split tensile strength and modulus of elasticity of concrete with a 0.4 fas using Styrofoam as a partial substitute for fine aggregate. The research method used is an experimental method by making the test object in the form of a concrete cylinder with a diameter of 15 cm and a height of 30 cm. The composition of the concrete mixture used is a volume ratio of 1 Pc: 2 Ps: 2 Kr with a fas 0.4. The styrofoam variations used are 10%, 20%, and 30% of the ratio to the volume of fine aggregate in normal concrete mixtures. Testing of the mechanical properties of concrete was carried out at the age of 7, 14, 21, and 28 days for the concrete compressive strength test, and 28 days for the split tensile strength of the concrete, and the modulus of elasticity. The results showed that the compressive strength of the concrete increased with the age of the concrete and the addition of the styrofoam variations with the exception of the 10% variation. For the split tensile strength test, there was an increase in line with the increase in the styrofoam variation, while the modulus of elasticity decreased at 10% variation against 0% variation and increased at 20% and 30% variation with 0% variation. Keywords: Concrete, Styrofoam, Variation.
KINERJA SERAT KAWAT BENDRAT SEBAGAI BAHAN TAMBAH BETON FAS 0.4 Lantif Anggrahita Pratama; Ahmad Hakam Rifqi; Muhtarom Riyadi
Construction and Material Journal Vol. 3 No. 1 (2021): Construction and Material Journal Vol. 3 No. 1 Maret 2021
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v3i1.3744

Abstract

Concrete is the most important part of a construction building. The purpose of this study was to examine how the comparison of physical and mechanical properties and optimum levels of the addition of straight tie wire as an added material with a water-cement ratio of 0.4. The percentage of addition of straight tie wire: 0%, 0.5%, 0.75%, 1.0%, of the total weight of the specimen with a tie-wire length of 8 cm. The test specimens for compressive strength, modulus of elasticity, and split tensile are in the form of a cylinder with a diameter of 15 cm and a height of 30 cm, and the specimen for flexural strength is a block with a length of 50 cm, a width of 10 cm and a height of 10 cm. The results show that the maximum compressive strength test on tie wire occurred at a percentage of 0.75% of 16.56 MPa. The maximum modulus of elasticity in tie wire occurred at a percentage of 0.75% of 15184.56 MPa. The maximum split tensile strength of tie wire occurred in a percentage of 0.75% of 1.165 MPa, and the maximum flexural strength of tie wire occurs at a percentage of 0.75% of 1.950 MPa. The research results concluded that the addition of a straight tie-wire to the concrete mixture could increase the compressive strength, split tensile strength, tensile strength, and elastic modulus of concrete. Keywords: Compressive Strength, Tensile Strength, Flexural Strength, Modulus Elasticity.
ANALISIS SIFAT FISIS AGREGAT HALUS PASIR DAN LIMBAH PLASTIK Muhtarom Riyadi; Tri Wulan Sari
Construction and Material Journal Vol. 3 No. 2 (2021): Construction and Material Journal Vol. 3 No. 2 Juli 2021
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v3i2.3935

Abstract

Based on SNI 03-2847-2002, concrete can be defined as a mixture of cement, fine aggregate, coarse aggregate, water, and with or without other additives. The purpose of this study was to analyze the physical properties of fine aggregate sand and plastic waste such as SSD specific gravity, SSD specific gravity, bulk density, sieve analysis, moisture content, and sludge content. According to the Indonesian National Standard (SNI), the method used is the observation method by conducting direct testing in the laboratory. The results obtained indicate that the study of fine aggregate sand by testing SSD bulk specific gravity, bulk density, sieve analysis, moisture content, and silt content meet the standard specifications for making concrete. At the same time, the research conducted on the fine aggregate of plastic waste did not meet the specifications.  Keywords: Aggregate, Physical Properties, Sand, Plastic Waste.
ANALISIS PENGARUH PENAMBAHAN LIMBAH PAKU TERHADAP SIFAT MEKANIS BETON NORMAL Teuku Muhammad Bhima; Muhtarom Riyadi; Lilis Tiyani
Construction and Material Journal Vol. 4 No. 3 (2022): Construction and Material Journal Vol. 4 No. 3 November 2022
Publisher : Politeknik Negeri Jakarta

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Abstract

The use of steel fibres as a concrete mixture can prevent cracks due to loading, the heat of hydration, and shrinkage. However, the availability of steel fibre is still limited, and it is expensive enough that alternative materials are required, which may reduce the economic value. This research aims to analyse the effect of an easy-to-find alternative material, namely plywood nail waste, on the properties of normal concrete. Concrete properties tests include compressive strength, split tensile strength, flexural strength, and modulus of elasticity. This research was conducted by mixing concrete with nail waste material with variations of 0%, 1%, 1.5%, and 2% of the weight of the concrete. Concrete samples in the shapes of cylinders and beams are required for this study.  The results showed that using nail waste can reduce the compressive strength of 28-day-old concrete and the modulus of elasticity as the variation of the nail waste increases. However, the use of nail waste in certain variations can increase the split tensile strength and flexural strength of concrete. Split tensile strength measurements after adding nail waste with varying amounts of 0%, 1%, 1.5%, and 2% were 2.279 MPa, 2.408 MPa, 2.068 MPa, and 1.583 MPa. The optimum variation was 1%, with an increase of approximately 5.64% of concrete without mixed waste nails. The variation of nail waste also produces flexural strength values of 1.95 MPa, 2.47 MPa, 2.21 MPa, and 1.43 MPa, so the optimum variation is 1%, with an increase of about 26.67% from the concrete without nail waste mixture. Keywords: Normal Concrete, Waste Nail, Mechanical Properties.
Co-Authors Ahmad Hakam Danindra Pramudya Wardana Gilang Fadhlurrahman Evriantama Lantif Anggrahita Pratama Lilis Tiyani Teuku Muhammad Bhima Tri Wulan Sari