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Mitigating autogenous shrinkage by means of superabsorbent polymers : effect on concrete properties
(Ultra-)high performance concrete ((U)HPC) is very prone to autogenous shrinkage cracking. These cracks can create preferential pathways for the ingress of harmful substances which can facilitate the corrosion process of the steel reinforcement, resulting in a decreased durability and structural integrity of the concrete structure. Superabsorbent polymers (SAPs) can reduce or even mitigate autogenous shrinkage as they absorb water in the fresh concrete mix and provide it to the cement particles at the right moment in the hydration process, acting as internal curing agent for the concrete. To study the mitigation of autogenous shrinkage by SAPs, five different superabsorbent polymers based on the copolymerization of acrylic acid (AA) with dimethylaminoethyl methacrylate (DMAEMA) were synthesized at Ghent University. This paper focusses on the compatibility tests aiming at evaluating the effect of these SAPs on initial flow and slump life (rheology), hydration kinetics (reactivity) and mechanical properties (3, 7 and 28 days strength). The most promising SAPs will be further studied on their effect to mitigate autogenous shrinkage.
Mitigating autogenous shrinkage by means of superabsorbent polymers : effect on concrete properties
(Ultra-)high performance concrete ((U)HPC) is very prone to autogenous shrinkage cracking. These cracks can create preferential pathways for the ingress of harmful substances which can facilitate the corrosion process of the steel reinforcement, resulting in a decreased durability and structural integrity of the concrete structure. Superabsorbent polymers (SAPs) can reduce or even mitigate autogenous shrinkage as they absorb water in the fresh concrete mix and provide it to the cement particles at the right moment in the hydration process, acting as internal curing agent for the concrete. To study the mitigation of autogenous shrinkage by SAPs, five different superabsorbent polymers based on the copolymerization of acrylic acid (AA) with dimethylaminoethyl methacrylate (DMAEMA) were synthesized at Ghent University. This paper focusses on the compatibility tests aiming at evaluating the effect of these SAPs on initial flow and slump life (rheology), hydration kinetics (reactivity) and mechanical properties (3, 7 and 28 days strength). The most promising SAPs will be further studied on their effect to mitigate autogenous shrinkage.
Mitigating autogenous shrinkage by means of superabsorbent polymers : effect on concrete properties
De Meyst, Laurence (author) / Pereira Gomes de Araújo, Maria Adelaide (author) / Mignon, Arn (author) / Van Tittelboom, Kim (author) / Van Vlierberghe, Sandra (author) / De Belie, Nele (author) / Staquet, Stéphanie / Aggelis, Dimitrios
2017-01-01
Early Age Cracking and Serviceability in Cement-based Materials and Structures ; ISBN: 978-2-35158-199-5 ; ISBN: 978-2-35158-198-8
Conference paper
Electronic Resource
English
DDC:
690
Mitigating Autogenous Shrinkage by Using Recycled Superabsorbent Polymers
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