The use of waste materials for concrete production in construction applications

International Conference on Innovative Technology, Engineering and Sciences 2018

工业技术;自然科学

Teara, Ashraf^1,2 ; Ing, Doh Shu^1 ; Tam, Vivian W.Y.^2

University Malaysia Pahang, Faculty of Civil Engineering and Earth Resources, Lebuhraya Tun Razak, Pahang. Gambang, Kuantan

26300, Malaysia^1

Western Sydney University, School of Computing Engineering and Mathematics, Locked Bag 1797, Penrith

NSW

2751, Australia^2

关键词: Compression strength;    Concrete productions;    Concrete strength;    Construction applications;    Damaged infrastructure;    Ordinary concretes;    Recycled aggregates;    Recycled concretes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/342/1/012062/pdf
DOI  :  10.1088/1757-899X/342/1/012062

来源: IOP

【 摘 要 】

To sustain the environment, it is crucial to find solutions to deal with waste, pollution, depletion and degradation resources. In construction, large amounts of concrete from buildings' demolitions made up 30-40 % of total wastes. Expensive dumping cost, landfill taxes and limited disposal sites give chance to develop recycled concrete. Recycled aggregates were used for reconstructing damaged infrastructures and roads after World War II. However, recycled concrete consists fly ash, slag and recycled aggregate, is not widely used because of its poor quality compared with ordinary concrete. This research investigates the possibility of using recycled concrete in construction applications as normal concrete. Methods include varying proportion of replacing natural aggregate by recycled aggregate, and the substitute of cement by associated slag cement with fly ash. The study reveals that slag and fly ash are effective supplementary elements in improving the properties of the concrete with cement. But, without cement, these two elements do not play an important role in improving the properties. Also, slag is more useful than fly ash if its amount does not go higher than 50%. Moreover, recycled aggregate contributes positively to the concrete mixture, in terms of compression strength. Finally, concrete strength increases when the amount of the RA augments, related to either the high quality of RA or the method of mixing, or both.