花岗岩/矿渣基碱激发材料的制备及性能研究

Synthesis and Characterization of Hybrid Granite/slag Based Alkali-Activated Materials

为探讨花岗岩废料的再生利用问题,以水玻璃和氢氧化钠为碱性激发剂,利用花岗岩和矿渣制备花岗岩基碱激发材料代替水泥,降低水泥生产过程中的二氧化碳排放,进而实现“碳达峰、碳中和”目标。通过力学性能试验和微观测试研究矿渣掺量、水玻璃掺量、氢氧化钠掺量、液固比等因素对花岗岩基碱激发材料性能的影响。结果表明:花岗岩/矿渣复合基碱激发材料具有良好的力学性能,在配比范围内,该碱激发材料的抗压强度随着矿渣掺量和水玻璃掺量的增加而增大。同时氢氧化钠掺量对该碱激发材料的抗压强度有显著影响,液固比对于抗压强度也有一定的影响。此外,花岗岩/矿渣复合基碱激发材料的强度主要由矿渣提供,花岗岩粉末主要起填充作用。

To explore the regeneration and utilization of granite waste,using sodium silicate and sodium hydroxide as alkali activators,granite,and slag were used to prepare granite-based alkali-activated material instead of cement,to reduce the carbon dioxide emission in the process of cement production and achieve the goal of“carbon peak,carbon neutrality”.The effects of slag content,sodium silicate content,sodium hydroxide content,liquid-solid ratio,and other factors on the properties of granite-base alkali-activated materials were studied by mechanical properties and microscopic tests.The results show that the granite/slag composite base alkali-activated material has good mechanical properties,and the compressive strength of the alkali-activated material increases with the increase of slag content and sodium silicate content within the proportion range.At the same time,the sodium hydroxide content has a significant effect on the compressive strength of the alkali-activated material,and the liquid-solid ratio also has a certain effect on the compressive strength.In addition,the strength of the alkali-activated material is mainly provided by slag,and the granite powder mainly plays the filling role.