Analisis Pengaruh Variasi Kadar Semen Terhadap Kuat Tekan Pada Lapis Pondasi Agregat Semen Kelas A (Cement Treated Base)

KEHI, Prima Yanuaria (2023) Analisis Pengaruh Variasi Kadar Semen Terhadap Kuat Tekan Pada Lapis Pondasi Agregat Semen Kelas A (Cement Treated Base). Undergraduate thesis, Universitas Katolik Widya Mandira Kupang.

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Abstract

The optimization of the role of highways is very dependent on the process of forming road pavements that meet standards, one of which is the development of Cement Treated Base or cement aggregate foundation layer. Cement Treated Base (CTB) is a type of pavement layer that uses portland cement as a binding material. To determine the effect of cement on CTB, research was conducted at the Laboratory of the NTT Provincial Public Works Office. The material used is coarse aggregate, namely 1 1/2" crushed stone and 3/4" crushed stone, while fine aggregate material, namely sand, is taken from the stockpile of PT. Bumi Indah Kupang. The cement used is portland cement type 1. The tests carried out are physical properties tests and mechanical property tests. Physical properties tests include specific gravity and water absorption tests, sieve analysis and aggregate wear or abrasion while mechanical properties tests include compaction experiments with optimum moisture content and compressive strength tests with a treatment period of 7 days. The variation of cement addition is 6%, 7%, 8%, and 9%. From the experimental results, variations in cement content on compressive strength show that the higher the cement added, the higher the compressive strength value. This is because when adding cement, the adhesion between aggregate grains becomes stronger and results in an increase in the compressive strength value of concrete. As in the variation of 6% cement content produces a compressive strength value of 46.17 kg/cm2, a cement content of 7% produces a compressive strength value of 57.08 kg/cm2, a cement content of 8% produces a compressive strength value of 65.23 kg/cm2 and a cement content of 9% produces a compressive strength value of 88.18 kg/cm2.

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