Pengaruh Penambahan Dregs Terhadap Kualitas Mortar

Abstract

The aim of the research was to know the influence of dregs usage in the mortar mixture against quality of mortar that was produced. Dregs is one of solid wastes that was produced from clarification on the pulp process. The use of dregs waste of the mortar mixture is expected to reduce the solid waste problems in the pulp and paper industry. On this research, dregs were added with 0%, 5%, 10%, 15% and 20% compared to cement weight. The ratio between cements and sands was 1:3. The specimen was made total 90 samples, the size of specimen is 5x5x5 cm. Preliminary test on the based materials such as sand and dregs was attended to verify the materials characteristic that was used on the mortar process. Then, the compressive strength, absorption, porosity, and specific gravity tests were conducted. Average result of compressive strength evaluation at age 7 days for the usage of dregs 0%, 5%, 10%, 15%, and 20% respectively were 14,748 MPA, 13,430 MPa, 13,216 MPa, 12,435 MPa, and 3,638 MPa. Average result of compressive strength evaluation at age 14 days for the usage of dregs 0%, 5%, 10%, 15%, and 20% respectively were 14,918 MPa, 14,723 MPa, 14,577 MPa, 14,134 MPa, and 4,040 MPa. Average result of compressive strength evaluation at age 28 days for the usage of dregs 0%, 5%, 10%, 15%, and 20% respectively were 15,253 MPa, 14,945 MPa, 14,745 MPa, 14,570 MPa, and 5,437 MPa. The high compressive strength was obtained for this mortar if the absorption, porosity are small and the high specific gravity.