Utilization of waste bottom ash as mineral additive with partial replacement of cement in geotechnical grouting works based on mechanical features

In this study, cementitious grout (CG) mixtures were produced using different water-binder (w/b) ratios (0.75, 1.00, 1.25, and 1.50) by replacing the bottom ash (BA) with cement in certain proportions (5, 10, 15, 20, 25, and 30%). Some laboratory experiments were carried out on the produced samples (soilcrete samples). In order of the experiments carried out; The bleeding test (BT), the unconfined compressive strength test (UCS), elasticity modulus (EM), ultrasonic pulse velocity (UPV) test. In addition, according to the results of the UCS test, it was determined how the fractures occurred in the samples. Especially when looking at the UCS test results of the samples cured for 28 days, it was observed that the UCS test results were between 4.92 and 12.82 MPa. In the literature, this value was around 2 MPa in deep mixes and sandcrete. In addition, 0.75 and 1.00 bleeding test results are below 10% by volume; 1.25 and 1.50 bleeding test results are above 10%, which is the maximum limit. The results found in the UPV test were found to be between 1550 and 2250 for samples with a curing period of 3 days, between 1800 and 2550 for samples with a curing period of 7 days, and between 2450 and 2800 for samples with a curing period of 28 days. According to the literature, UPV test results were found at very low speed for curing times of 3 days and 7 days for soilcrete samples and at low speed for curing days of 28 days. Also, a good correlation (R2 = 0.93) was seen between UCS and UPV in all mix results. Eventually, it was observed that most parts of the samples prepared for these experiments failed along foliations.