tailieunhanh - Một số đặc tính kỹ thuật của bê tông sử dụng tro bã mía đã xử lý thay thế một phần xi măng

Sản xuất xi măng từ clinker thải ra nhiều khí cacbonic (CO2) vào khí quyển, gây ô nhiễm môi trường. Sử dụng kết hợp vật liệu phụ gia khoáng, có nguồn gốc từ phụ phẩm của quá trình sản xuất công, nông nghiệp như xỉ lò cao nghiền mịn, tro bay, tro trấu với xi măng góp phần giảm phát thải khí nhà kính. Bài viết trình bày một số đặc tính kỹ thuật của bê tông sử dụng tro bã mía đã xử lý thay thế một phần xi măng. | Tạp chí Khoa học Giao thông Vận tải Tập 73 Số 6 08 2022 630-646 Transport and Communications Science Journal ENGINEERING PROPERTIES OF CONCRETE PREPARED WITH TREATED SUGARCANE BAGASSE ASH AS A PARTIAL CEMENT REPLACEMENT Duc Hien Le1 Yeong Nain Sheen 1Facultyof Civil Engineering Ton Duc Thang University No 19 Nguyen Huu Tho Street Ho Chi Minh City Vietnam 2Department of Civil Engineering National Kaohsiung University of Science and Technology No 415 Jiangong Rd. Kaohsiung City Taiwan ARTICLE INFO TYPE Research Article Received 09 11 2021 Revised 25 04 2022 Accepted 14 07 2022 Published online 15 08 2022 https Corresponding author Email leduchien@ Tel 84908120937 Abstract. Cement production is causing serious impacts to the environment due to CO2 emission to the atmosphere. The utilization of mineral admixtures sourced from industrial agricultural processes such as slag fly ash rice-husk ash in blends with Portland cement has been widely accepted to lessen that concern. Sugarcane bagasse ash SBA a by product of combustion of bagasse in boiler is potentially used in that way. The present study addresses to enhance suitability of SBA as a partial cement replacement 5 10 15 20 by mass concrete compositions. For this purpose SBA was treated by burning in a furnace at 700 oC for 1 h before use. Physical and chemical characteristics of the resulting ash were characterized and engineering properties of the SBA-blended concretes have been investigated. The testing results show that treated SBA is silica-rich in amorphous form. Portland cement being replaced by SBA at level of 10 or greater causes a significant drop in slump of blended concrete. Increasing amount of SBA to replace cement results in reduction of mechanical strengths at any testing ages. In addition there is minor difference in water absorption among all concrete mixtures after 91 days of curing. The mechanical strengths and the internal porosity of concrete are .