钙基地聚合物抗酸腐蚀性能研究

Study on Acid Corrosion Resistance of Calcium-Based Geopolymer

摘要: 以偏高岭土、矿渣、水泥为原材料，制备出具有较好性能的钙基地聚合物，研究了不同原材料配合比对钙基地聚合物抗压强度的影响，以及钙基地聚合物在酸溶液浸泡后的物相、微观结构及外观变化。结果表明：偏高岭土掺量为60%、矿渣掺量为25%、水泥掺量为15%时，钙基地聚合物正常养护28 d抗压强度最高为70.1 MPa；钙基地聚合物具有良好的抗化学腐蚀性能，在硫酸浸泡120 d后，抗压强度最高为47.5 MPa；钙基地聚合物主要成分为无定型凝胶，从SEM观察到样品浸泡后出现微裂缝和孔洞，逐渐被腐蚀产物填满；硫酸对钙基地聚合物的侵蚀主要是因为SO₄^2-的膨胀性破坏和H⁺的溶蚀性破坏的共同结果。

Abstract: One kind of superior calcium-based geopolymer was prepared with metakaolin, slag and cement as raw materials. The effects of mix ratio of raw materials on the compressive strength were in-vestigated, and the phase composition, microstructure and appearance change of calcium-based geopolymer after soaking in sulphuric acid solution were studied. The results show that when the content of metakaolin is 60%, slag is 25% and cement is 15%, the compressive strength of calci-um-based geopolymer is 70.1 MPa after 3 days maintenance. The calcium-based geopolymer has good chemical corrosion resistance, and the compressive strength of calcium-based geopolymer is 47.5 MPa after 120 days of sulfuric acid soaking. The main component of calcium-based geopolymer is amorphous gel. Micro cracks and holes can be observed from calcium-based geopolymer sample after immersion by SEM, and gradually filled with corrosion products. The corrosion of sulfuric acid on calcium-based geopolymer was the combined effect of the expansive destruction of SO₄^2- and the corrosion damage of H⁺.