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Concrete
Published in A. Bahurudeen, P.V.P. Moorthi, Testing of Construction Materials, 2020
This test is used to determine the water absorption rate by hydraulic cement concrete. Water absorption is determined by measuring the increase in specimen mass with respect to time resulting from the absorption of water when only one of its surfaces is exposed to water (CoMSIRU, 2018b).
Application of recycled concrete aggregates and crushed bricks on permeable concrete road base
Published in Road Materials and Pavement Design, 2021
Xu Cai, Kuanghuai Wu, Wenke Huang, Jiangmiao Yu, Huayang Yu
The results presented in Table 11 show that the void ratio of the designed reclaimed aggregate permeable concrete is about 25%, which indicates that the application of optimised volume design method can achieve the design goal, and the water absorption of the recycled mineral material must be considered in the design. Secondly, the effective void ratio of the four concretes is about 15%, which indicates that the effective voids of the concrete are mainly related to the grading of the main minerals. When the gradation and cement consumption are the same, the effective voids of the materials are basically the same. However, the water permeability coefficients of four concretes are different. The water permeability coefficient of CB-15 is the highest, followed by that of CB-0. In addition, the water permeability coefficient of CB-50 is the lowest and has the value of 0.18 cm/s. The reason for this phenomenon is that, with the increase in water absorption, the water–cement ratio increases under the condition that the effective water–cement ratio remains constant. However, it is difficult for the aggregate to absorb all the water during a short-time mixing, leading to the leakage of cement slurry. Figure 7 shows the phenomena of leakage, blocking of the gap in the lower part of the specimen, and reduction of the permeability coefficient of the material. The cement slurry blocks the lower part of the specimens and reduces the permeability coefficient of the material, as shown in Figure 7(a).
Characterization of lime mortar additivated with crystallization modifiers
Published in International Journal of Architectural Heritage, 2018
Sanne J.C. Granneman, Barbara Lubelli, Rob P.J. Van Hees
The capillary water absorption of the mortar with and without modifiers was determined according to EN1015-18. The lateral sides of the 5x5x2 cm3 mortar slabs were covered with epoxy, to prevent absorption and evaporation from the lateral sides during testing. After the measurement of the capillary absorption, the water absorption coefficient (WAC) was calculated. After capillary absorption, the bottom of the specimens was covered with removable tape and the specimens were placed under controlled environmental conditions (20°C/50%RH) while drying. The weight of the specimens was monitored at different time intervals during drying.
Expanded clay basalt fiber concrete: Solving structural defects caused by water penetration
Published in Cogent Engineering, 2021
Paschal Chimeremeze Chiadighikaobi, Bewuket Bekele Tefera, Tarka Rilwan Olakunbi, Jean Paul Vladimir
Absorption of water value is one of the most important parameters of rocks that have an impact on physical and mechanical properties. This is mostly important for building stones, quality for hygiene, aesthetic view, and structural safety. Thus, water absorption of concrete is explained as the proportion of water, which can be absorbed by stone or other concrete coarse aggregate under specific immersion conditions which leads to degradation of strength, abrasion, and frost resistance of the concrete depending on the pore system (Balakrishna et al., 2019; Matarul et al., 2016; Md Noor et al., 2017; Shaikh, 2016).