基于碱激发剂作用下火山灰的活性研究

The Volcanic Ash Activity With the Action of Alkaline Activator

掺碱激发剂火山灰-水泥既可以有效利用火山灰和保护环境,又可以改善火山灰-水泥胶凝材料的性能.选用掺合料为火山灰,变换不同含量的碱激发剂(氢氧化钠与水玻璃),测定龄期为7、28、90 d时混凝土的力学性能,确定最佳组合,并进行电镜试验,观察微观结构.研究结果表明:掺碱激发剂会使胶凝材料的强度随碱掺量的变化而变化,掺氢氧化钠的早期强度要优于掺水玻璃的早期强度,而后期掺水玻璃的强度要比掺氢氧化钠的强度发展得好.

Volcanic ash mixed alkali excitation agent-cement can effectively utilize the fly ash and protect the environment,also can improve the performance of volcanic ash-cement gel material. Selecting volcanic ash as admixture,changing different alkali activator’s content(NaOH & Na2SiO3 · 9H2O),we analyzed the mechanical properties of concrete at the age for 7 d,28 d and 90 d,to determine the best combination,and observe microscopic structure with a scanning electronic microscope. The results show that the strength of cementitious materials with the mixed alkali activator will change with alkali dosage. The early strength of mixed NaOH is superior to that of mixed Na2SiO3 · 9H2O,while the development strength of mixed Na2SiO3 · 9H2O will be better than that of mixed NaOH.