Analisis Pengaruh Perbandingan Variasi Faktor Air Semen Terhadap Kuat Tekan Dan Kuat Tarik Belah Beton Normal

Concrete is a widely used construction material for buildings, bridges, and roads. It consists of cement, coarse aggregate, fine aggregate, and water. The selection of materials is crucial for achieving high-quality concrete. The coarse aggregate used is Moramo split with a size of 1-2 cm, the fine aggregate is Pohara sand, Tonasa PCC (Portland Composite Cement) is the cement used, and clean water is used as a mixture. The water-cement ratio (WCR), which is the ratio of the weight of water to the weight of cement, plays a vital role in determining the strength of concrete.
This study aims to analyze the effect of WCR variations on the compressive and splitting tensile strength of normal concrete. The WCR variations used are 0.32,
0.42, and 0.52, with cylindrical test specimens (15 cm diameter, 30 cm height) totaling 18 specimens. The preparation process followed SNI 03-2834-2000, including mixing, molding, and curing for 28 days.
The results show that lower WCR values produce higher compressive and splitting tensile strength. At a WCR of 0.32, the compressive strength reached 26.52
MPa, and the splitting tensile strength was 2.69 MPa, or 10.13% of the compressive strength. A WCR of 0.42 produced a compressive strength of 20.67 MPa and a splitting tensile strength of 1.84 MPa, or 8.9% of the compressive strength. Meanwhile, a WCR of 0.52 resulted in a compressive strength of 17.65 MPa and a splitting tensile strength of 1.56 MPa, or 8.8% of the compressive strength. A WCR of 0.32 is recommended for normal concrete with a target compressive strength of f’c 25 MPa.