Effect of superabsorbent polymer internal curing on the performance of recycled aggregate concrete
Source abstract
Abstract
In this study, the effects of the particle size gradient and dosage of polyacrylic acid superabsorbent resin (SAP) on the mechanical properties of recycled aggregate concrete (RAC) were analyzed through macroscopic experiments. Using response surface methodology optimization, the optimal SAP parameters were determined to be a particle size of 67.17 mesh and a dosage of 0.248%. Salt–frost cycle tests revealed that compared with ordinary RAC, SAP-RAC reduced the mass loss rate by 17.4%, the compressive strength loss rate by 7%, and the chloride ion permeability coefficient by 6%. The established salt–frost damage model closely matched the experimental data. Nuclear magnetic resonance testing and scanning electron microscopy analysis indicated that SAP promotes secondary hydration reactions by absorbing and releasing water, thereby refining the pore structure of SAP-RAC. However, the salt–freezing coupling effect weakens the thickness and density of the interfacial transition zone (ITZ).
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Innovative concrete reinforcement materials · Concrete and Cement Materials Research · Recycled Aggregate Concrete Performance
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Water Resources and Hydropower, Xi’an University of Technology
State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology
Funding
National Natural Science Foundation of China · Technology Innovation Leading Program of Shaanxi
References (42)
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