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All Journal REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
N.N. Kencanawati
Jurusan Teknik Sipil, Fakultas Teknik Universitas Mataram, Mataram, Indonesia 83115
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Identifikasi Karakteristik Fisik Berbagai Jenis Agregat Halus dan Korelasinya pada Sifat Beton Segar dan Beton Padat N.N. Kencanawati; S. Rawiana; A. Rofaida; N.A. Febriyanti
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 4 Issue 2 (September 2023)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v4i2.574

Abstract

One of the main constituents of concrete is fine aggregate or sand. As a filler, the characteristics of sand affect the properties of both fresh and hardened concrete. The aim of this research is to identify the characteristics of various types of sand and to correlate them with the properties of the concrete. The type of sand used in the experiment is common type of sand used in construction; for instance, silt sand, river sand, and beach sand, as well as recycled sand from concrete waste. The examination on physical characteristics includes visualization with a digital microscope, specific gravity, water absorption, fine modulus, and impurities content. This characteristic is compared with the value of slump, concrete unit weight, and concrete compressive strength. Quarry sand has denser particles and a fairly coarse texture, while recycled sand has the finest, hollowest, lightest particles and a lighter color than other sands. According to the properties of fresh concrete, silt sand produces the lowest slump value while recycled sand has the highest slump value. A positive correlation in the form of y = 1,55x + C is obtained from the relationship of the specific gravity of sand (x) to the compressive strength of concrete (y) and constants (C). the same correlation but in a negative relationship is obtained from the influence of water absorption characteristics
Karakteristik Aspal Buton Ekstraksi yang Dimodifikasi dengan Oli Bekas dan Plastik HDPE I.D.M.A. Karyawan; N.N. Kencanawati; H. Hariyadi; H. Hasyim; R. Rohani
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 4 Issue 2 (September 2023)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v4i2.596

Abstract

Asphalt functions as an aggregate binder in the road pavement mixture. The rapid construction of roads causes the need for asphalt to increase, while its availability is limited. The government is promoting the use of natural asphalt (Asbuton) as an alternative to oil asphalt. However, asphalt performance from Asbuton is not good. Uneven asphalt content and Asbuton hardness are factors causing it to be less effective as a binder. It is necessary to improve performance by modifying the bitumen separated from Asbuton granules by the extraction process. The modifications were made using used oil and high-density polyethylene (HDPE) plastic waste. Samples were made for each variation of used oil and HDPE in two ways: a constant 5% used oil composition and a constant 2% HDPE. In the constant 5% oil variation, 0%, 2%, 4%, and 6% HDPE are used. Whereas at a constant 2% HDPE, 0%, 3%, 5%, and 7% used oil are used. The tests carried out were: 1) Moisture content and ash content of asphalt extracted from Asbuton, 2) Penetration of asphalt, 3) Ductility; 4) Loss of weight, 5) specific gravity, 6) softening point, and 7) flash and burn points. The performance of modified asphalt is known from the results of data analysis from the tests carried out. The results of the analysis showed that in the asphalt weight loss test, specific gravity, and softening point, pure Asbuton extraction asphalt and the results of the modification as a whole met the requirements. However, in the penetration test, only 3 variations met the requirements, namely: 5% and 7% used oil, and 2% and 6% HDPE. Whereas in the ductility test, flash point, and burning point, all variations and asphalt extraction of pure Asbuton did not meet the requirements. Low ductility, meaning that asphalt does not have good cohesive properties. The low flash point and burning point indicate that the asphalt is easy and fast to burn, which affects the mixing process. Thus, it is still necessary to optimize the composition of the modifier so that the requirements for ductility, flash point, and firing point are met.
Co-Authors A. Rofaida H. Hariyadi Hasyim, Hasyim N.A. Febriyanti S. Rawiana