Effect of waste sand from construction sand on consistency and strength of mortar for masonry

  • Hung Phan Quang
  • Trinh Bui Phuong
Keywords: Waste sand, Compressive strength, Flexural strength, Consistency, Mortar for masonry

Abstract

In recent years, natural river resource at Vietnam is increasingly depleted in addition to the negative impacts on environmental from river sand exploitation. Meanwhile, waste sand (occupying about 4.0%) is released from construction sand before applying into mortar for masonry at the construction sites. The utilization of waste sand as a replacement of natural river sand used for construction contributes to bringing effective economy and environmental protection. Therefore, this study concentrates on investigating the effect of the natural river sand replacement with waste sand at mass ratios of 25, 50, 75, and 100% on engineering properties of cement-based mortar with a water-to-cement ratio of 0.5 and a fine aggregate-to-cement ratio of 3. Results indicated that the use of waste sand from 25–100% reduced consistency of fresh mortar from 2.94–35.29%, flexural strength from 5.94–18.13%, and compressive strength from 5.17–24.10% of mortar at an age of 28 days. Consequently, the replacement of river sand with 25% waste sand was effective in producing mortar for masonry because this replacement still ensured consistency and strengths of mortar as per TCVN 4314:2022.

điểm /   đánh giá
Published
2023-10-28