การศึกษาผลเปลือกไข่ต่อกำลังอัดและสมบัติทางกายภาพของมอร์ตาร์

Abstract

        This study aimed to investigate the effect of calcined egg shell on compressive strength and physical properties of mortar. The egg shell from industrial was calcined at 1,100 °C for 4 hrs. Calcined eggshell was used as a precursor for mortar production. The cement to sand ratio at 1 : 2 and cement to water ratio at 1 : 1 were designed. The calcined eggshell was used to replace part of cement at 0, 10, 20, 30, 40 and 50 % by volume. Results showed that bulk density, apparent density and compressive strength of mortar were higher than mortar control. However, bulk density, apparent density, water absorption, and compressive strength were decreased with increasing eggshell contents. For sample at 7 days, the compressive strength was in the range of 1.13 – 6.97 MPa. The bulk density was in the range of 1.18 – 1.51 g/cm³. The apparent density was in the range of 2.08 – 2.74 g/cm³. The water absorption was in the range of 27.38 – 41.35 %. For sample at 28 days, the compressive strength was in the range of 3.40 – 7.63 MPa. The bulk density was in the range of 1.21 – 1.68 g/cm³. The apparent density was in the range of 2.26 – 2.86 g/cm³. The water absorption was in the range of 26.93 – 40.70 %. As from the results, the calcined eggshell could be used as potential alternative cement for mortar production and building material applications.