Effect of UHPC Curing Temperature on Mechanical Properties
As is well known,the thermal curing can significantly improve the early strength of UHPC,but currently in engineering applications,it is more difficult to realize the higher curing temperatures(≥80℃),which departs from the increasing green environmental protection demand.In order to promote the application of UHPC and guide the construction of engineering projects,a low-temperature(30℃～70℃)thermal curing relatively easy to realize is proposed.The mechanical performance development of hot water curing for 1 d,2 d,3 d and 4 d under the conditions of 30℃,50℃,70℃ and 90℃ is studied,and compared with the strength of standard cured 28 d specimens The results show that after 4 days of curing at 30℃,50℃ and 70℃,the compressive strength is 694％886％and 92.9％of the 90℃ hot water curing for 2 d respectively,and is 838％1070％and 1122％of the standard curing for 28 d.The variation of bending tensile strength with the increase of temperature and curing time is relatively small,and the deviation of bending tensile strength at several curing temperatures for 4 d is within 4％.It can be seen that the relatively low temperature thermal curing can meet the requirements for the mechanical properties of UHPC.
UHPCcuring temperaturecuring timelow temperature thermal curing
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