Capillary Water Absorption Properties and Prediction Model of Reinforced Coral Aggregate Concrete
SU Li1, NIU Ditao2,*, HUANG Daguan3, ZHANG Yunsheng1, QIAO Hongxia1
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 3 School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China
Abstract: Three types of coral aggregate concrete (CAC) were designed including fly ash CAC, silica fume CAC and slag CAC, fly ash CAC was used as a reference sample. The improved ASTM C1585 method was used to investigate the capillary water absorption characteristics of CAC at 28 d and 60 d. The influence of silica fume and slag on CAC capillary water absorption and porosity was analyzed, and the initial sorptivity prediction model was established. The results indicate that the incorporation of silica fume and slag significantly reduced the capillary water absorption of CAC, but the reducing effect on the capillary water absorption of CAC decreased with the increase of silica fume and slag content. With the increase of curing age, the decreasing effect of silica fume and slag on capillary water absorption is also weakened. At 28 d, the capillary water absorption of CAC containing 4% silica fume or 20% slag is the lowest;at 60 d, the capillary water absorption of CAC containing 6% silica fume or 20% slag is the lowest. In the entire water absorption stage, reduction effect of silica fume on the cumulative water absorption of CAC is greater than that of slag. Adding 4% silica fume or 20% slag can effectively reduce the porosity of CAC. At the same time, there is a good correlation between theoretical pore volume and secondary water absorption. The initial water absorption prediction model of CAC established by regression analysis can predict the initial water absorption rate of CAC with different content of silica fume and slag.
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2023, Vol. 37 
