The effect of geopolymer slurries with clinker aggregates and marble waste powder on embodied energy and high-temperature resistance in prepacked concrete: ANFIS-based prediction model

As a special concrete type, the prepacked concrete is the aggregates placed in the mold before-hand and then produced by injecting the prepared slurry between the aggregate particles. Using geopolymer slurries in prepacked concrete can be a more sustainable solution. Geopolymer is an inorganic polymer produced using various industrial wastes (containing SiO2 and Al2O3) and alkaline solutions. The present work investigated the effect of geopolymer slurry on prepacked concrete's physical, mechanical, transport and environmental properties using natural coarse aggregates. Instead of clinker aggregate, 50, 100, 150 and 200 kg/m3 waste marble powder (WMP) was used in the geopolymer slurry. The produced geopolymer prepacked composites (GPC) were heated for 6 and 8 h at 40 and 70 degrees C. The apparent porosity of GPCs varies between 5.8 and 15.4% and their water absorption ranges between 2.8 and 9.5%. As the WMP rises, the water absorption and porosity of the GPCs increase. The hardened unit weight of all GPC samples is below 2400 kg/m3. GPC samples heat cured at 40 degrees C had a compressive strength of 6.6-15.9 MPa, whereas samples cured at 70 degrees C had a compressive strength of 21.9-45.8 MPa. As the heat curing temperature and time increased, the porosity of the GPC samples decreased and their compressive strength increased. GPC samples' capillary water absorption ranges from 0.12 to 1.6 kg/m2. The capillary void content reduced as the heat cure temperature rose. WMP was added to GPC mixes, which enhanced high-temperature resistance. In GPC mixes heated to 600 degrees C, the compressive strength greater than 10 MPa, was assessed. Embodied energies of GPCs vary be-tween 4116 and 4851 MJ/kg. In addition, mixing ratios and curing properties can be determined with high accuracy with the ANFIS algorithm in GPC design. Map cracks were frequently formed in the microstructures of the samples. The carbonation products were inspected in the matrix at FT-IR analysis. As an observation, increasing the WMP content increases the high-temperature resistance of geopolymer slurries and decreases the amount of embodied energy.