Effect of high temperature environment in the early curing period on mechanical properties of fly ash based geopolymer
WANG Xu
YANG Zhengxun
ZHANG Zheng
HUO Zhiqiang
XIA Jin'gang
Abstract：In order to study the effects of temperature and duration changes and alkali activator concentration on the mechani-cal properties of fly ash based geopolymer in the early curing period,three concentrations of NaOH solution were used as the raw material of alkali activator to prepare silicaluminate geopolymer.The samples were cured at high temperature in the early curing pe-riod and then at room temperature.The strength of the samples was tested for 3 d,7 d and 28 d,and its change mechanism was ana-lyzed.The results showed that the compressive strength of the geopolymers at the age of 3 d and 7 d was positively correlated with the initial curing temperature,duration and alkali concentration.After curing at 60℃for 12 h,the strength of the geopolymers at 3 d was 4 times that at room temperature.In the samples of 28 d,the compressive strength at room temperature could reach 42.8 MPa,and the high alkali concentration was more conducive to the development of sample strength.The strength of the specimens after high temperature curing in the early stage increased slowly compared with that at room temperature.The increase of high temperature curing time and temperature is helpful to improve the macroscopic compactness of the sample.
Keywords：fly ash based geopolymeralkali concentrationcuring conditionmechanical propertiespore structuremicrostructure
Publication Date：2023-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 12-17 )