| dc.description.abstract | A waste is a resource out of place. Therefore, proper reclaim and reuse of wastematerials can meet the goal for sustainable development of resource. In order tobeneficial use of waste materials, this study was aim to utilize the admixture of sewagesludge ash (SSA) incorporated with other waste pozzolanic material, granulated blastfurnace slag (GBFS), into the cement mortar for reducing the amount of cementdemand. Also, many studies found that adding a small fraction of short fibers to mortarmixture during mixing was an effective way to improve the structure of cement mortar.For these reasons, this study intended to replace part of cement by the reclaimedmaterials of SSA and GBFS to produce a so-called “recycled cement mortar (RCM)”.Additionally, the recycled waste fiber, steel or plastic fiber, was also applied into RCMas the reinforced material. The overall objective was expected to investigate thefeasibility of applying large amount of waste materials as resources into cement mortar,and eventually, to obtain a RCM with well engineering properties, for example,compressive strength, flexural strength and drying shrinkage.
Experimental results revealed that the RCM which using the admixture of SSAand GBFS to replace 50% of cement could obtain a close compressive strength ascompare to that of control specimen, but still could not enhance the flexural strengthand improve dry shrinkage. It indicated the necessary of further modification of RCM.Regarding the application of recycled waste fibers to reinforce RCM, the resultsshowed that the waste steel fiber could improve the engineering properties of RCM,included compressive strength, flexural strength and drying shrinkage. Thecompressive strength and flexural strength of RCM with waste steel fiber ranges from0.5 to 2 % by volume were about 5~21% and 20~71%, respectively, better than thoseof unreinforced RCM. Also, the reduction of the drying shrinkage was about 5~17%.In addition, the waste plastic fiber was only slight improvement in flexural strengthand drying shrinkage but no effect on the compressive strength of RCM. Consideringthe benefits of modification and the influence of workability of specimen, the optimumcontent of plastic fiber and steel fiber added to RCM was 0.5 and 1% by volume,respectively. | en_US |