Print Email Facebook Twitter Experimental and numerical study on the mitigation of autogenous shrinkage of cementitious material Title Experimental and numerical study on the mitigation of autogenous shrinkage of cementitious material Author Lu, T. (TU Delft Materials and Environment; Southwest Petroleum University) Liang, X. (TU Delft Materials and Environment) Liu, C. (TU Delft Materials and Environment) Chen, Y. (TU Delft Materials and Environment; South China University of Technology) Li, Z. (University of Sheffield) Date 2023 Abstract This study experimentally investigated the effects of surfactants and water-repelling agents on the hydration process, relative humidity, and mechanical properties of Portland cement pastes. Based on the measurement results, the degree of hydration, degree of saturation, capillary tension of autogenous shrinkage, and magnitude of autogenous shrinkage were simulated using a numerical model. In the numerical model, the elastic and creep components of autogenous shrinkage were calculated separately, and the creep component was simulated based on the solidification theory. The simulation results indicated that adding admixtures led to lower degrees of hydration and saturation. The capillary tension of the pure Portland cement was larger than that of the other mixtures. This can be attributed to several factors, including the smaller surface tension of mixtures with surfactants, larger contact angle of mixtures with water-repelling agents, and a lower degree of hydration of mixtures with both admixtures. Analyses of the simulated and measured results for different mixtures also show that creep plays an indispensable role in autogenous shrinkage. Adding a surfactant and a water-repelling agent can effectively mitigate autogenous shrinkage. However, when an excessive amount of water-repelling agent was added, its influence on the mitigation of autogenous shrinkage was insignificant. Subject Autogenous shrinkageCement pasteSimulationSurfactantWater-repelling agent To reference this document use: http://resolver.tudelft.nl/uuid:51aea123-9bad-4e6f-83db-83ebd2b716ee DOI https://doi.org/10.1016/j.cemconcomp.2023.105147 ISSN 0958-9465 Source Cement and Concrete Composites, 141 Part of collection Institutional Repository Document type journal article Rights © 2023 T. Lu, X. Liang, C. Liu, Y. Chen, Z. Li Files PDF 1_s2.0_S0958946523002214_main.pdf 7.38 MB Close viewer /islandora/object/uuid:51aea123-9bad-4e6f-83db-83ebd2b716ee/datastream/OBJ/view