4TH International Congress on Technology - Engineering & SCIENCE - Kuala Lumpur - Malaysia (2017-08-05)

Investigating Hydrostatic Pressure Resistivity And Sorptivity Of Crystallization Waterproofing And Dampproofing Materials With Concrete
The objective of this study is to characterize the effect of the crystallization waterproofing materials additives and coating against the water movements with regard to water penetration depth and capillary rise water absorption (sorptivity). Depending on the observation of the usefulness of the water penetration depth and the sorptivity parameters, this paper aims to characterizing the ability of these materials to supporting the hydrostatic pressure and capillary suction respectively and assist in the specification of good practices. In order to monitor the crystals and their role in reducing the capillary pores diameters, scanning electron microscopy (SEM) images were analyzed morphologically. This study was considered two curing regimes, one of them is water-curing regime to ensure that the capillary pores filled with water and the other is drying regime, consequently to investigate the effect of capillary water to stimulate the crystals to form. For coating crystallization materials, the coating layers at certain ages were removed to investigate the participation of it on reducing studied parameters. Results have shown that most of these materials coating and/or additives have significantly reduced the concrete sorptivity, especially the initial rate of water absorption (mm/s1/2). Present of water in capillary pores, water-curing regime, has a significant effect on the materials performance against hydrostatic pressure and sorptivity. On the other hand, crystallization waterproofing materials additives have shown a significant reduction in water penetration depth compared with the coating materials. In addition, for some coating materials, coating layers play a partial role as lining defense parallel to the formed crystals to reduce both water penetration depth and/or sorptivity. Finally, SEM shown that, the crystals contribute to reduce the capillary diameter approximately by 65 ± 5 %.
Keywords: Sorptivity, Water permeability, capillary pores, crystallization waterproofing materials
Mona Elsalamawy, Ashraf R. Mohamed, Abd-Ellatif Abosen