Enhancement Mechanism of Mechanical Properties of Steam-Cured UHPC by Nano-C-S-H/PCE
At present,the mechanical properties of ultra-high performance concrete(UHPC)products need to be further improved,and the use of nano-C-S-H/PCE to enhance UHPC is a feasible technical way in theory.The effect of nano-C-S-H/PCE on the mechanical properties of UHPC under steam-cured condition was studied.The influence mechanism was analyzed by measuring hydration heat,hydration products,microstructure and pore structure.The results show that the incorporation of 3.0％(mass fraction)nano-C-S-H/PCE significantly increases compressive and flexural strengths of steam-cured UHPC.The addition of nano-C-S-H/PCE can promote the hydration in early age of UHPC and form more C-S-H gel,and increase the exothermic temperature peak of hydration and shorten time to reach the hydration temperature peak.Also,the pore structure of steam-cured UHPC can be improved effectively by adding nano-C-S-H/PCE,and the total porosity and harmful pore proportion are the lowest at 3.0％(mass fraction)nano-C-S-H/PCE.This study can provide a theoretical reference for the application of nano-C-S-H/PCE in steam-cured UHPC.
万方数据
维普
