Analisis Perbandingan Merek Semen (Semen Tiga Roda, Semen Tonasa, Semen Merdeka) Terhadap Sifat Mekanik Beton

Abstract

Abstract: The selection of cement types in various construction projects, particularly small- and medium-scale projects, is often based primarily on cost considerations without adequately considering their effects on concrete quality. Higher cement prices do not necessarily result in better mechanical properties of concrete, while lower prices do not necessarily indicate inferior quality. This study aims to compare several brands of Portland Composite Cement (PCC) with different price levels in terms of the mechanical properties of concrete to examine the relationship between material cost and the resulting concrete quality. The study employed a laboratory experimental method with a target concrete strength of 30 MPa. The cement types used were Tiga Roda, Tonasa, and Merdeka. The tests included compressive strength, splitting tensile strength, and shear strength, and the results were analyzed by comparing material costs with the mechanical properties of the concrete. The compressive strength test results showed that concrete produced using Tiga Roda and Tonasa cement achieved strengths of 37.12 MPa and 32.03 MPa, respectively, whereas Merdeka cement achieved 29.65 MPa and therefore did not meet the target strength, which was attributed to an ineffective curing process. The highest splitting tensile strength was obtained using Tonasa cement at 3.30 MPa, followed by Tiga Roda at 3.26 MPa and Merdeka at 3.11 MPa. The highest shear strength was obtained using Tiga Roda cement at 7.70 MPa, followed by Tonasa at 7.56 MPa and Merdeka at 6.86 MPa. The results indicate that Tiga Roda cement, which had the highest price, tended to produce higher mechanical properties than Tonasa cement at an intermediate price and Merdeka cement at the lowest price. Thus, a tendency toward a relationship between cement price and the mechanical performance of concrete was observed.

Abstrak: Pemilihan jenis semen pada berbagai proyek konstruksi, khususnya pekerjaan berskala kecil dan menengah, sering kali didasarkan pada pertimbangan biaya tanpa memperhatikan pengaruhnya terhadap mutu beton. Harga semen yang lebih tinggi tidak selalu menghasilkan sifat mekanik beton yang lebih baik, begitu pula harga yang lebih rendah tidak selalu menunjukkan kualitas yang rendah. Penelitian ini bertujuan membandingkan beberapa merek semen Portland Composite Cement (PCC) dengan variasi harga terhadap sifat mekanik beton untuk mengetahui hubungan antara biaya material dan kualitas beton yang dihasilkan. Penelitian menggunakan metode eksperimen laboratorium dengan mutu rencana sebesar 30 MPa. Semen yang digunakan adalah Tiga Roda, Tonasa, dan Merdeka. Pengujian meliputi kuat tekan, kuat tarik belah, dan kuat geser, kemudian hasilnya dianalisis dengan membandingkan biaya material terhadap sifat mekanik beton. Hasil pengujian kuat tekan menunjukkan semen Tiga Roda dan Tonasa mencapai 37,12 MPa dan 32,03 MPa, sedangkan semen Merdeka mencapai 29,65 MPa sehingga belum memenuhi mutu rencana akibat proses perendaman yang kurang efektif. Kuat tarik belah tertinggi diperoleh semen Tonasa sebesar 3,30 MPa, diikuti Tiga Roda 3,26 MPa dan Merdeka 3,11 MPa. Kuat geser tertinggi diperoleh semen Tiga Roda sebesar 7,70 MPa, diikuti Tonasa 7,56 MPa dan Merdeka 6,86 MPa. Hasil penelitian menunjukkan bahwa semen Tiga Roda dengan harga tertinggi cenderung menghasilkan sifat mekanik lebih tinggi dibandingkan semen Tonasa dengan harga menengah dan semen Merdeka dengan harga terendah, sehingga terdapat kecenderungan hubungan antara harga semen dan kinerja mekanik beton.