Bài viết Ảnh hưởng của tỉ lệ phối trộn đến co ngót của bê tông sử dụng cát mịn phối trộn cát nghiền trong xây dựng cầu trình bày các kết quả nghiên cứu biến dạng co ngót của bê tông có sử dụng cát hỗn hợp. | Transport and Communications Science Journal Vol 73 Issue 3 04 2022 268-276 Transport and Communications Science Journal EFFECT OF MIXING RATIO ON SHRINKAGE OF CONCRETE USING FINE SAND MIXED WITH CRUSHED SAND IN BRIDGE CONSTRUCTION Nguyen Duc Dung Nguyen Duy Tien Thai Khac Chien University of Transport and Communications No 3 Cau Giay Street Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 21 01 2022 Revised 17 03 2022 Accepted 25 03 2022 Published online 15 04 2022 https Corresponding author Email nguyenducdung@ Tel 84983418480 Abstract. To overcome the shortage of large-grained natural sand in traffic projects in the Mekong Delta region mixed sand made by mixing fine sand with crushed sand is being used as an alternative. Crushed sand and fine sand have properties that are different from natural sands such as grain shape rough surface texture and high friction which affect the physical properties of the mixed sand in particular increase pore structure increased surface area and increased water absorption these factors directly affect the shrinkage of concrete. In this paper the author presents the shrinkage deformation of concrete using mixed sand. The ratio of crushed sand fine sand is selected respectively as 50 50 60 40 70 30. The three methods of curing concrete are as standard sealed and curing free respectively. Experimental results show that concrete using mixed sand has a higher shrinkage value than concrete using natural sand and the ratio of crushed sand fine sand increases the shrinkage increases. Keywords Shrinkage fine sand crushed sand. 2022 University of Transport and Communications 268 Tạp chí Khoa học Giao thông vận tải Tập 73 Số 3 04 2022 268-276 Transport and Communications Science Journal ẢNH HƯỞNG CỦA TỈ LỆ PHỐI TRỘN ĐẾN CO NGÓT CỦA BÊ TÔNG SỬ DỤNG CÁT MỊN PHỐI TRỘN CÁT NGHIỀN TRONG XÂY DỰNG CẦU Nguyễn Đức Dũng Nguyễn Duy Tiến Thái Khắc Chiến Trường Đại học Giao thông vận tải Số 3 Cầu Giấy Hà .
