Effects of carbonation curing time on mechanical properties of ecological porous concrete
Carbonation curing is an effective measure to improve the mechanical properties of ecological porous concrete and reduce alkalinity,and carbonation curing time is one of the key influencing factors.In this paper,the effect of different carbonation curing time on the mechanical properties and microstructure of ecological porous concrete with fly ash was investigated.The results show that compared with the standard curing,the carbonation curing time of 2 h is the best,which makes the 3 d compressive strength of ecological porous concrete with different fly ash content increase by 34.6%～63.1%,and the 28 d compressive strength increase by 7.7%～16.8%.The carbonation curing of 10 h leads to the 28 d compressive strength of concrete decreased by 14.3%～32.7%.Appropriate time of carbonation curing can make the carbonation product calcium carbonate better fill the pore and interfacial transition zone,and effectively improve the early compressive strength of ecological porous concrete.However,too long time of carbonation curing will consume cement clinker and calcium hydroxide excessively,which will weaken the pozzolanic effect of fly ash in the later stage and affect the strength development.
万方数据
维普
