TY - JOUR
T1 - Effectiveness of preconditioning regimes for assessing water permeability of high performance concrete
AU - Wang, Yaocheng
AU - Yang, Kai
AU - Long, Adrian
AU - Bai, Yun
AU - Nanukuttan, Sreejith
AU - Magee, Bryan
AU - Basheer, Muhammed
PY - 2018/8/29
Y1 - 2018/8/29
N2 - Saturating high performance concrete (HPC) on site for assessing water permeability is a challenge. This paper reports a testing programme established to assess the reliability and efficiency of two field saturation approaches, viz. vacuum saturation and ponding. The water permeability test results after applying the vacuum saturation and ponding were compared with that after incremental immersion. It is found that ponding was unable to remove the influence of moisture, while vacuum saturation can achieve this for wet concretes. Although the influence of moisture can be removed for different HPCs with high initial moisture contents by using the vacuum saturation method, it is not effective when the initial moisture content is low. The results obtained from numerical simulation model and the electrical resistance measurements after incremental immersion suggested that the water permeability of HPCs can be accurately determined if the surface region (140 mm width and 25 mm depth) is fully saturated.
AB - Saturating high performance concrete (HPC) on site for assessing water permeability is a challenge. This paper reports a testing programme established to assess the reliability and efficiency of two field saturation approaches, viz. vacuum saturation and ponding. The water permeability test results after applying the vacuum saturation and ponding were compared with that after incremental immersion. It is found that ponding was unable to remove the influence of moisture, while vacuum saturation can achieve this for wet concretes. Although the influence of moisture can be removed for different HPCs with high initial moisture contents by using the vacuum saturation method, it is not effective when the initial moisture content is low. The results obtained from numerical simulation model and the electrical resistance measurements after incremental immersion suggested that the water permeability of HPCs can be accurately determined if the surface region (140 mm width and 25 mm depth) is fully saturated.
KW - Pore tourtuosity
KW - Alkali-activated slag cement
KW - pore solution
KW - electrical resistivity
KW - capillary porosity
KW - X-ray uCT
UR - https://pure.ulster.ac.uk/en/publications/effectiveness-of-preconditioning-regimes-for-assessing-water-perm
U2 - 10.1016/j.cemconcomp.2018.08.018
DO - 10.1016/j.cemconcomp.2018.08.018
M3 - Article
SN - 0958-9465
VL - 94
SP - 126
EP - 135
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -