Bài viết nghiên cứu nhằm mục tiêu tối ưu hoá thành phần của bê tông đất. Thí nghiệm nén dọc trục và co ngót của bê tông được thực hiện tại các thời điểm và trong các điều kiện bảo dưỡng khác nhau (trong thùng bảo dưỡng và trong điều kiện thường). | Transport and Communications Science Journal Vol 71 Issue 8 10 2020 924-934 Transport and Communications Science Journal EXPERIMENTAL STUDY ON COMPRESSIVE STRENGTH AND SHRINKGAGE OF SOIL CONCRETE Ngo Duc Chinh University of Transport and Communications No 3 Cau Giay Street Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 13 9 2020 Revised 21 10 2020 Accepted 22 10 2020 Published online 28 10 2020 https Corresponding author Email chinhnd@ Tel 09 65 81 03 81 Abstract. In this study soil concrete is composed of natural earth clay sand cement lime and hemp fibers. A series of 12 soil concrete mixtures were designed using different contents of clayey soil ranging from 0 to 40 and of hemp fibers ranging from 0 to by mass. This study aim to optimize the composition of the soil concrete. The tests were carried out on the specimens in the laboratory for determing the compressive strength shrinkage at two curing conditions in box in asmosphere . The results show that the compressive strength of soil concrete at 28 days is quite good over 1MPa and continuously increases at 180 days . With only a small vibration during construction this soil concrete is sufficient for filling application wall of a frame building . The results also show that the shrinkage of the soil concrete depends strongly on the proportion of clayey soil and hemp fibers. The shrinkage of the soil concrete is much higher than that of traditional concrete because of the absence of large aggregates that limits total shrinkage. The porosity of this soil concrete is also higher than traditional concrete due to its large content of clayey soil and clay is a hydrophilic material Keywords Eco-concrete soil concrete hemp fibers clayey soil shrinkage compressive strength. 2020 University of Transport and Communications 924 Tạp chí Khoa học Giao thông vận tải Tập 71 Số 8 10 2020 924-934 Tạp chí Khoa học Giao thông vận tải NGHIÊN CỨU THỰC NGHIỆM CƯỜNG ĐỘ CHỊU
