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To generate sustainable mortars, this study investigated the impacts of adding two wastes into portland cement mortar: polyurethane powder waste (PU), and foundry exhaust sand (FES). The tests were carried out utilizing a response surface methodology (RSM) configuration with four different manufacturing variables: sand to cement ratio, coarse sand content (CS), FES, and PU replacing natural sand (NS). Compressive strength, modulus of elasticity, void index, and water absorption (Wa) all had substantial fitting values in the data. Furthermore, the experimental findings show that the adopted model is capable of accurately predicting the outcomes, and an optimized mortar combination was discovered and is presented. [ABSTRACT FROM AUTHOR]

The addition of Superabsorbent Polymer (SAP) decreases the effect of autogenous shrinkage present in pastes, mortars, and concretes. In this study we investigated the influence of the addition of SAP in self-compacting cement paste mixtures. Eighteen 5 × 10 cylindrical specimens were molded in all, three for each mixture (CPII base, CPII 0.15%SAP/600μm, CPII 0.15%SAP/800 μm, CPV base, CPV 0.15%SAP/600 μm, CPV 0.15%SAP/800 μm). Two types of cement were tested, CP II-Z and CP V-ARI with 0.15% of weight replaced per two diameters of SAP (600 μm and 800 μm). The samples followed the standards required. Mini slump tests were carried out in the fresh state, and uniaxial compressive strength, elastic modulus, specific mass, absorption, and air content in the hardened state after 28 days. The results obtained show the SAP is high indicated to replaced cement in small % of weight i/to fresh and hardened paste. Likewise, the group mix n° 3 composed of CPII 0.15% of SAP with 800 μm diameter presented the best result. [ABSTRACT FROM AUTHOR]