Concrete, in the broadest sense, is any mass product made by the use of cementing medium. Therefore, concrete tiles is made from Portland Cement and fine aggregate as the filler materials. The increasing of cement price affects on the building cost. Research for qualified and economical concrete tiles needs to be encouraged and developed because cheap concrete tiles will save the construction cost. Trass utilizes to substitute part of the cement used is expected to fulfill this need.
Concrete tile specimens were made from 1 portion of Portland Cement and 3 portions of fine aggregate with water/cement ratio of 0.50. Trass granules diameter of pass filter no. 200 was added to the tile mortar using 10%, 20%, 30%, 40% and 50% proportion to substitute part of the cement used in the same percentage. After the specimens reached 28 days, flexural, water infiltration resistance, and water absorption power tests were conducted.
The test results showed that as the trass content increased the concrete tile flexural strength decreased and the water absorption power increased. The water absorption power of all of the tested specimens met the Indonesian Industrial Standard and the trass content to comply with the standard flexural strength, was 10%. Other contents did not meet the standard. Based on the water infiltration resistance, all of the tested specimens still required additional efforts in order to comply with the requirements
