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Physical, Mechanical, and Microstructural Properties of Alkali-Activated Paste and Mortar
Published in Kushal Ghosh, Partha Ghosh, Alkali-Activated Fly Ash Blast Furnace Slag Composites, 2020
Sorptivity is a material property which characterizes the tendency of a porous material to absorb and transmit water by capillary action. The measurement of sorptivity has primary importance in durability assessment. The durability of cementitious materials is largely influenced by the rate of ingress of detrimental ions such as chlorides, sulphates, etc. (water as a carrier). Hence, the knowledge of moisture transport through the cementitious material is of great importance.
Hydrophilic mineral wool materials: The effect of fiber orientation
Published in Paul Fazio, Hua Ge, Jiwu Rao, Guylaine Desmarais, Research in Building Physics and Building Engineering, 2020
P. Michálek, M. Jiřičková, Z. Pavlík, R. Černý
Sorptivity concept is the simplest way to describe uptake of water by porous materials. For soft materials as mineral wools this concept is very suitable because the deformation of the samples during the measurements can be avoided in a relatively easy way, which is for instance not the case of moisture diffusivity determination from moisture profiles measured on rod samples. Therefore, sorptivity was chosen as the basic parameter characterizing liquid moisture transport.
Mechanical and durability performance of sustainable bacteria blended fly ash concrete: an experimental study
Published in International Journal of Sustainable Engineering, 2020
Santosh A. Kadapure, Girish Kulkarni, K.B Prakash, Poonam S. Kadapure
Sorptivity indicates the rate of penetration of water into the pores of concrete by capillary suction. Low sorptivity is the primary requirement to produce durable concrete. The cubes were supported on small supports. The arrangement was such that only the lowest 10 mm of the prism was submerged. The rise in water level in concrete which manifests itself by dark colour was measured at periodic intervals of 15 min. The procedure was continued till the rise in water level was stopped. The sorptivity was evaluated by using the formula mentioned in the following:
Performance evaluation of concrete using treated recycled aggregates modified with mineral admixtures: Influence of processing
Published in European Journal of Environmental and Civil Engineering, 2023
Abhishek Verma, B. S. Velaga, S. Arunachalam
A Sorptivity test was performed to measure the rate of water absorption from the capillary rise. The test was carried out according to ASTM C 1585-04 (2021). The sorptivity was expressed in g/mm2/min0.5. Figures 16 and 17 show the sorptivity of concrete specimens at 28 days and 90 days, respectively. Owing to capillary action, sorptivity is calculated regarding the rate of water absorption by unsaturated concrete specimens (Santha Kumar, 2019). Sorptivity in concrete is due to insufficient mixing and the presence of hair cracks within the concrete structure. Improper mixing and poorly compacted concrete exhibited high sorptivity (Kurda et al., 2019). This allows for the movement of water by interconnecting capillary voids (Hentges et al., 2022). Based on the test results, the sorptivity value increases with an increase in the w/c ratio. Sorptivity results for 90 days show improvement compared to 28 days due to the continuous hydration process. The sorptivity at 28 days with RA, TRA, TRA(PPC), TRA(SF), and NA are 6.8 × 10−4, 4.58 × 10−4, 3.85 × 10−4, 3.35 × 10−4, 2.15 × 10−4 g/mm2/min0.5, respectively. The order of improvement in the sorptivity results followed the sequence NA > TRA(SF)> TRA(PPC)> TRA > RA. Removal of the adherent mortar improves aggregate quality by removing loose mortar content (Tahar et al., 2017). This further shows an improvement of the concrete generated with TRA with a lower sorptivity value than RA. The surface coating of aggregate with mineral admixtures was also improved the sorptivity values as compared to RA. TRA(SF) tests result from TRA(PPC) at all water-cement ratio shows lower sorptivity values compared to untreated RA. The processing of RA reduced the thickness as well as the quantity of loose adherent mortar. The ITZ and weak microstructure of RA was improved by treating mineral admixtures viz: (silica fume and Portland pozzolana cement). The formation of a thin layer around the periphery of RA improved the ITZ, filling pores, cracks, and fissures and densifying the RAC. The sorptivity value is increased by up to 40% when RCA was used in concrete (F. U. A. Shaikh & Nguyen, 2013). A similar type of test result was also reported by some other researchers from different countries (Evangelista & de Brito, 2010; Nehdi et al., 2004; Verma et al., 2021)