Abstract
To study the permeability of superabsorbent polymer (SAP) modified concrete and the effect of internal pore characteristics on the permeability of concrete specimens, the results of the water penetration under pressure test, the mercury intrusion porosimetry (MIP) test, and scanning electron microscopy (SEM) of SAP concrete were obtained and analyzed. The research shows that the addition of an appropriate amount of SAP can effectively improve the anti-permeability performance of concrete. After adding 0.2~0.6% SAP of cement quality to concrete, the penetration height value was reduced by 35~45%, the porosity was increased by 21–95%, and the tortuosity is increased by 14–15%, and all indicators show regular changes with the increase in SAP usage. Adding SAP to concrete changes the internal connection state of concrete, thereby further improving its impermeability by reducing the capillary pressure and changing the shape of the pores. The liquid permeation resistance is increased by the “threshold effect” inside concrete; this “threshold effect” is caused by the addition of SAP.
Highlights
With the improvement of the aesthetic and functional requirements of building structures, highstrength concrete is increasingly used in modern civil engineering structures
The results show that the anti-permeability of concrete can be obtained with a low dosage of superabsorbent polymer (SAP)
The addition of SAP with a small dosage and a small particle size can improve the impermeability of concrete more obviously
Summary
With the improvement of the aesthetic and functional requirements of building structures, highstrength concrete is increasingly used in modern civil engineering structures. SAP can be used as an internal curing material for low water cement ratio concrete. The addition of the proper amount of SAP to this cement-based material can effectively improve the characteristics of the concrete, thereby widening the application field of concrete. The external media, such as water and gas, are transported in various forms within the material, mainly through its own connected pores and fractures. To study the permeability of superabsorbent polymer (SAP) modified concrete and the effect of the internal pore characteristics on the permeability of concrete specimens, the results of the water penetration under pressure test, the mercury intrusion test, and scanning electron microscopy (SEM) of SAP concrete were obtained and analyzed
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