Title: Use of Waste Bricks and Tiles as a Pozzolan-Like Material in Concrete
Author(s): H.-S. Peng, H.-J. Chen, C.-W. Tang, and H.H. Pan
Publication: Symposium Paper
Appears on pages(s): 447-462
Keywords: bricks; pozzolanic reaction; tiles
The application of building rubble collected from damaged structures has become an important issue in Taiwan. The reuse of construction wastes not only conserves the finite raw materials and reduces energy consumption, but also can be a solution for environmental protection. Among the wastes, bricks and tiles were produced under high temperature sintering, which is similar to the producing process of pozzolanic materials like fly ash or slag. Such material might lead to the pozzolanic reaction in concrete. This research intends to investigate the probability to replace the natural sand or cement by using waste bricks and tiles. First, the gradient of fine aggregate was fixed. Four replacement percentages (25%, 50%, 75%, and 100%) were selected to replace part of natural sand in the mortar mixtures. Then the influence to the proporties of mortars was estimated according to the test results. The bricks and tiles were ground into powder with the same fineness of cement. Three replacement percentages (10%, 20%, and 30%) were selected to replace part of cement. The influence to the proporties of mortars was estimated as well. Test results show that the strength of mortars using waste bricks and tiles as fine aggregate is slightly lower than that of the control batch. However, the strength efficiency is good. On the other hand, the mortar containing brick or tile powder possesses higher long-term compressive strength because of the pozzolanic reaction.