Study on manufacturing method of improving the strength of UHPC under natural curing conditions

Abstract

Standard or steam curing is generally used in the production of ultra-high performance concrete (UHPC), which puts forward higher hardware conditions for the production of this material. In order to promote the popularization and application of UHPC, it is necessary to explore its fabrication method under natural curing, that is, without accurate control of temperature and humidity. The research method used in this paper is experimental analysis. By adjusting the components of UHPC materials, adjusting the proportion of each component, humidifying with watering and other simple measures, the methods to improve the strength of UHPC under natural curing conditions are explored. The experimental results show that the addition of high-efficiency solid water reducer can make the UHPC blocks have higher compressive strength than liquid water reducer. When the ratio of silica fume to cement is 30%, the compressive strength of UHPC reaches the maximum. Reducing or increasing the silica fume will reduce the strength of UHPC. Humidification by simple watering can be used to improve the compressive strength of UHPC. UHPC with strength over 100MPa can still be obtained under natural curing condition.