Experimental and Numerical Investigation on the Mechanical Properties of Concrete with High Volumes of Modified Phosphogypsum
Source abstract
Abstract
The effects of high-temperature modified phosphogypsum (HPG), incorporated at contents of 40%, 50%, and 60%, on the compressive strength and elastic modulus of mortar and concrete were investigated. Additionally, the influence of graded granulated blast furnace slag powder (GGBS), quicklime, and silica fume on the mechanical properties of HPG-based mortar (HPGM) and HPG-based concrete (HPGC) was discussed. Moreover, the microstructure of HPGM was analyzed using scanning electron microscopy (SEM). A two-dimensional mesoscale model of HPGC was developed to predict how variations in HPG content, coarse aggregate characteristics, and interfacial transition zone (ITZ) characteristics influence the compressive strength and elastic modulus of HPGC. The experimental results showed that high volumes of HPG weakened the mechanical properties of HPGM and HPGC, while appropriate amounts of mineral admixtures offset the negative effects caused by calcium hydroxide (Ca(OH)2) crystals and impurities within the system. The simulation results indicated that the maximum deviation between the mesoscale model prediction and experimental data was only 8.38%, which verified the accuracy of the mesoscale model prediction. The compressive strength of HPGC initially decreased and subsequently increased with the rise in the modulus and content of coarse aggregate, whereas it declined with higher HPG dosage and increased ITZ thickness. In contrast, the elastic modulus of HPGC showed a gradual increase with rising coarse aggregate content and improved ITZ mechanical properties, while it decreased as HPG content and ITZ thickness increased.
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Research context
OpenAlex topics: Rock Mechanics and Modeling · Concrete and Cement Materials Research · Innovative concrete reinforcement materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering, Central South University, Changsha 410000, China
National Engineering Research Center for High Speed Railway Construction, Changsha 410000, China
China Construction Second Engineering Bureau Ltd., Beijing 100160, China
China Railway Group Ltd., Beijing 100039, China
School of Civil Engineering, Guizhou University, Guiyang 550025, China
School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410000, China
China Railway 20th Bureau Group Sixth Engineering Ltd., Xi’an 710000, China
Funding
National Natural Science Foundation of China · the Science and Technology Research and Development Program Project of China Railway Group Limited · the Science and Technology Research and Development Subject of China Construction Second Engineering Bureau Ltd. · Natural Science Foundation for Distinguished Young Scholars of Hunan Province · Hunan Science and Technology Plan Project
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