垃圾焚烧灰熔融重构矿渣对水泥基材料性能的影响

研究了不同掺量下(10%、20%、30%、50%)的垃圾焚烧灰和重构矿渣对水泥基材料性能的影响,并通过扫描电镜(SEM)、X射线衍射(XRD)等测试技术分析了影响机理。研究结果表明:相比于纯水泥,垃圾焚烧灰掺量为50%的水泥基材料终凝时间缩短为75 min,标准稠度用水量增加至28.7%,重构矿渣掺量为50%的水泥基材料终凝时间延长至335 min,标准稠度用水量增加至29.8%。垃圾焚烧灰的活性较低,随着垃圾焚烧灰掺量的增加,水泥砂浆抗压强度先增大后减小,当其掺量为10%时,28 d抗压强度达到最大(51.5 MPa);重构矿渣的活性高于垃圾焚烧灰,在碱性环境的激发下,水化后期重构矿渣发生二次水化反应,生成较多的水化产物,掺重构矿渣的水泥砂浆强度先增大后减小,当重构矿渣掺量为20%时,28 d抗压强度达到最大值48.8 MPa。

Effect of MSWI fly ash melting reconstructed slag on the properties of cement-based materials

Effect of the mixture blended cement with MSWI fly ash and reconstructed slag by the dosage of 10%,20%,30%,50% respectively on the properties of cement-based materials were studied,then the influence mechanism was analyzed by scanning electron microscopy (SEM),and X-ray diffraction (XRD).It turned out that,in comparison with cement,the final setting time of cement-based materials mixed with 50% MSWI fly ash was shortened to 75min,the water requirement of normal increased to 28.7%,the final setting time of cement-based materials mixed with 50% reconstructed slag was extended to 335min,the water requirement of normal increased to 29.8%.The cementitious activity of MSWI fly ash was low,the compressive strength showed a trend of decrease after the first increase of the specimen mixed with the dosage increase of MSWI fly ash,its compressive strength surpass the pure cement strength by 51.5MPa when the dosage was 10%.The activity of reconstructed slag was higher than MSWI fly ash,under alkaline environment,second hydration occur to reconstructed slag,and it generate large numbers of hydration products,the compressive strength showed a trend of decrease after the first increase of the specimen mixed with reconstructed slag,it had the maximum compressive strength of 48.8MPa at curing 28d with the dosage of 20%.