It was found that the geopolymeric binder formed in the presence of GBFS is similar to the
geopolymeric binder found in the absence of GBFS. When the concentration of NaOH used is low, calcium dissolved from the GBFS will take part in the formation of amorphous CSH gel, in preference to the formation of a calcium based geopolymer. CSH gel can be formed within a geopolymeric binder if soluble calcium is available in the mixture. However, if there is excess amount of hydroxides present in the system, the precipitation of calcium hydroxide will be promoted. Subsequently, the precipitation of calcium hydroxide will inhibit any possible formation of CSH gel within a geopolymeric binder unless a significant amount of calcium is present initially. It is suggested that the coexistence of geopolymeric gel and CSH gel is responsible for the strength increase in matrices containing a moderate amount of GBFS. This binder is suggested to be the modern version of ancient concrete. The formation of CSH gel within a geopolymeric binder is working as a micro-aggregate, such that the resultant binder is homogeneous and dense, resulting in increased mechanical strength.
It was found that the geopolymeric binder formed in the presence of GBFS is similar to thegeopolymeric binder found in the absence of GBFS. When the concentration of NaOH used is low, calcium dissolved from the GBFS will take part in the formation of amorphous CSH gel, in preference to the formation of a calcium based geopolymer. CSH gel can be formed within a geopolymeric binder if soluble calcium is available in the mixture. However, if there is excess amount of hydroxides present in the system, the precipitation of calcium hydroxide will be promoted. Subsequently, the precipitation of calcium hydroxide will inhibit any possible formation of CSH gel within a geopolymeric binder unless a significant amount of calcium is present initially. It is suggested that the coexistence of geopolymeric gel and CSH gel is responsible for the strength increase in matrices containing a moderate amount of GBFS. This binder is suggested to be the modern version of ancient concrete. The formation of CSH gel within a geopolymeric binder is working as a micro-aggregate, such that the resultant binder is homogeneous and dense, resulting in increased mechanical strength.
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