Effectiveness of metakaolin and hybrid polymers incorporated mortar for the compressive strength and acid resistance of industrial and wastewater infrastructure

摘要

Concrete used in sewer pipes and industrial areas is susceptible to acid attacks that can significantly damage wastewater infrastructure. This investigation addresses the effect of using both mineral and polymer admixtures on the flowability, compressive strength, and the resistance against sulfuric acid and hydrochloric acid attacks on the modified mortars. The cement was replaced by 10% and 15% of metakaolin along with 5% of two polymer powders: ethylene-vinyl-acetate and polyvinyl-acetate. Raw kaolin clay was heated at 800 degrees C for 8 hours to produce metakaolin. The pozzolanic activity was determined by both strength-activity index and X-ray diffraction method. A total of 180 specimens was cast and tested for compressive strength and acid resistance. The outcomes revealed that the workability, along with compressive strength, was improved significantly up to 24% and 18.43%, respectively. While acid resistance of modified mortar was also enhanced considerably by 59.9% and 24.9% against hydrochloric and sulfuric acids, respectively, proving the combinations to be very effective against acid attacks. The investigation focuses on resolving the major wastewater infrastructure issue besides acid utilizing industry and leads toward sustainability. Much sustainable, durable, and environment-friendly mortar compositions have been suggested to be used in areas prone to acid attacks.