Abstract
The strength of Ultra-High Performance Concrete (UHPC) can be sensitively affected by the curing method used. However, in contrast to the precast plant production of UHPC where a standard high-temperature steam curing is available, an optimum curing condition is rarely realized with cast-in-place UHPC. Therefore, the trend of the compressive strength development of UHPC was experimentally investigated in this study, with a focus on early-age strength by assuming the various curing conditions anticipated on site. Concrete specimens were cured under different conditions with variables including curing temperature, delay time before the initiation of curing, duration of curing, and moisture condition. Several conditions for curing are proposed that are required when the cast-in-place UHPC should gain a specified strength at an early age. It is expected that the practical use of UHPC on construction sites can be expedited through this study.
Highlights
Ultra-High Performance Concrete (UHPC) has been one of the most active research fields of concrete recently, because it can contribute to the longer life and economic efficiency of structures [1,2]
Apart from fully cast-in-place UHPC structures, a precast-type UHPC structure is planned for stable quality control and acceleration of construction [5], some components, such as the joints of precast UHPC segments, still need to be cast in-place [6]
This study focuses on the minimum curing conditions of cast-in-place K-UHPC that are required to ensure a similar target strength to that of precast K-UHPC at an early age
Summary
Ultra-High Performance Concrete (UHPC) has been one of the most active research fields of concrete recently, because it can contribute to the longer life and economic efficiency of structures [1,2]. Apart from fully cast-in-place UHPC structures, a precast-type UHPC structure is planned for stable quality control and acceleration of construction [5], some components, such as the joints of precast UHPC segments, still need to be cast in-place [6]. These cast-in-place components of a UHPC structure can significantly affect the overall quality of the structure and construction speed, since they are cast possibly under limited and unfavorable conditions on the site. Another important application of cast-in-place UHPC is the rehabilitation of existing structures [1,7]
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