The Ratio of Cement and Sand from Lake Bingkuang as Aggregate to Create Foam Mortar 2,000 kPa

Abstract Riau is known as the Province that has largest peat soil where construction of roads on will result in subsidence surface.The purpose this study to replace top layer foundation for road with lighter and stronger materials according PUSJATAN 2013 standard acompressive strength more than 2000 kPa volume weight less 0.9 tons/m3by using foam mortar consist cement (PCC), sand, foam, water. The test conducted include gradation analysis specific gravity test.Then proceed making a mixture composition ratio sand 1C:0.4S, 1C:0.5S, 1C:0.6S, 1C:0.7S order create cylindrical sample diameter 10 cm height 20 cm. There are 3 samples each so total number 54. Then compressive were carried out CBR modified. From results, amount 525 kg 1C: 0.6S can float water, density 0.834 tons/m3 2,401.40 kPa.