A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Simulating the Hydration Process of Low Water to Cement (w/c) Ternary Pastes Incorporating Superabsorbent Polymers (SAP)
Early age cracking is a high risk for low water to cement (w/c) concrete known as the ultra-high performance concrete (UHPC). The lack of water to fully hydrate cement particles at the early age, provides a rapid increase of self-desiccation and autogenous shrinkage which might lead to cracking. However, internal curing agents such as superabsorbent polymers (SAP) can reduce/eliminate crack development by providing water to the mixture. In this study, a numerical model called CemPP was presented, using a modified version of CEMHYD3D v3 by creating a dedicated pass for the simulation of the hydration process and the microstructure development of low w/c ternary pastes (with silica fume and filler) containing SAPs. Both the filler effect and pozzolanic reaction of silica fume were considered in the numerical simulation, as well as the effect of the water release of SAPs on the hydration process of cement at the early age. The evolution of small pores was lower for SAP pastes than for the reference ones as seen in the experimental results, which indirectly implies lower shrinkage for SAP pastes. The model has been verified to successfully simulate SAP behaviour in cement pastes, and give a good idea about the shrinkage evolution.
Simulating the Hydration Process of Low Water to Cement (w/c) Ternary Pastes Incorporating Superabsorbent Polymers (SAP)
Early age cracking is a high risk for low water to cement (w/c) concrete known as the ultra-high performance concrete (UHPC). The lack of water to fully hydrate cement particles at the early age, provides a rapid increase of self-desiccation and autogenous shrinkage which might lead to cracking. However, internal curing agents such as superabsorbent polymers (SAP) can reduce/eliminate crack development by providing water to the mixture. In this study, a numerical model called CemPP was presented, using a modified version of CEMHYD3D v3 by creating a dedicated pass for the simulation of the hydration process and the microstructure development of low w/c ternary pastes (with silica fume and filler) containing SAPs. Both the filler effect and pozzolanic reaction of silica fume were considered in the numerical simulation, as well as the effect of the water release of SAPs on the hydration process of cement at the early age. The evolution of small pores was lower for SAP pastes than for the reference ones as seen in the experimental results, which indirectly implies lower shrinkage for SAP pastes. The model has been verified to successfully simulate SAP behaviour in cement pastes, and give a good idea about the shrinkage evolution.
Simulating the Hydration Process of Low Water to Cement (w/c) Ternary Pastes Incorporating Superabsorbent Polymers (SAP)
RILEM Bookseries
Escalante-Garcia, J. Ivan (editor) / Castro Borges, Pedro (editor) / Duran-Herrera, Alejandro (editor) / Kheir, Judy (author) / Hilloulin, Benoît (author) / Loukili, Ahmed (author) / De Belie, Nele (author)
RILEM Annual Week ; 2021 ; Merida, Mexico
Proceedings of the 75th RILEM Annual Week 2021 ; Chapter: 13 ; 100-107
RILEM Bookseries ; 40
2023-03-11
8 pages
Article/Chapter (Book)
Electronic Resource
English
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