矿渣与碱用量对地聚合物混凝土物理力学性能的影响

Effect of Slag and Alkali Dosage on Physical and Mechanical Properties of Geopolymer Concrete

以粉煤灰和矿渣为硅铝质原材料,Na2SiO3与NaOH为碱性激发剂制备地聚合物混凝土,探究粉煤灰与矿渣掺比、碱激发剂用量、砂率等因素对地聚合物混凝土力学性能,吸水率的影响。研究表明矿渣含量增加,地聚合物混凝土的力学强度也随之增大,但吸水率减小,矿渣含量超过40%后力学强度的增长变缓,当矿渣含量为80%时力学强度最大。随着碱用量的增加地聚合物混凝土的吸水率增加,但力学强度先增后减,碱用量为11%时力学性能最优。随着砂率增加地聚合物混凝土的力学强度先增后减,当砂率为30%时力学强度最大。

Geopolymer concrete was prepared by using fly ash and slag as silicon-aluminum raw materials, and Na2SiO3 and NaOH as alkaline activators. The effects of fly ash and slag ratio, alkali activator dosage and sand ratio on the mechanical properties and water absorption of geopolymer concrete were investigated. The results show that the mechanical strength of geopolymer concrete increases with the increase of slag content, but the water absorption decreases. When the slag content exceeds 40%, the growth of mechanical strength slows down. When the slag content is 80%, the mechanical strength is the largest. With the increase of alkali dosage, the water absorption of geopolymer concrete increases, but the mechanical strength increases first and then decreases. The mechanical properties are optimal when the alkali dosage is 11%. With the increase of sand ratio, the mechanical strength of geopolymer concrete increases first and then decreases. When the sand ratio is 30%, the mechanical strength is the largest.