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Damage in reinforced concrete structures is frequently caused by reinforcement corrosion due to carbonation. Although a wide range of literature contributed to the concrete carbonation consisting of experimental investigations and numerical simulations, research work on a complete numerical model for concrete carbonation prediction with integrated climatic variables (e.g., temperature, relative humidity) is still a challenge. The present paper aims to propose an advanced numerical model to simulate the penetration of carbon dioxide and moisture, diffusion of calcium ions, heat transfer, and porosity modification in concrete material using COMSOL Multiphysics software. Three coupled mass conservation equations of calcium, water, and carbon dioxide are solved together with additional equations regarding the heat transfer, variation of porosity, and content of portlandite and other hydrates and calcites. In this study, the actual temporal variabilities of temperature and relative humidity in Toulouse, France, are used as a case study. The predicted results of portlandite profiles and carbonation depth are compared with the experimental data and discussed to identify the effect of climatic variables on the concrete carbonation.
Viet Ngo; Ngoc Nguyen; Frédéric Duprat; Ngoc Vu; Viet Nguyen. Climatic Issue in an Advanced Numerical Modeling of Concrete Carbonation. Sustainability 2021, 13, 5994 .
AMA StyleViet Ngo, Ngoc Nguyen, Frédéric Duprat, Ngoc Vu, Viet Nguyen. Climatic Issue in an Advanced Numerical Modeling of Concrete Carbonation. Sustainability. 2021; 13 (11):5994.
Chicago/Turabian StyleViet Ngo; Ngoc Nguyen; Frédéric Duprat; Ngoc Vu; Viet Nguyen. 2021. "Climatic Issue in an Advanced Numerical Modeling of Concrete Carbonation." Sustainability 13, no. 11: 5994.
It has been well recognized that reinforced concrete (RC) flat slab structures are prone to collapse under their heavy-weight following an initial failure such as a punching shear failure that happened at a slab-column connection and column removal. In this study, the collapse behaviour of such building structures is investigated both experimentally and numerically. In the experimental part, a 1/3-scale flat slab structure is statically tested to complete collapse using distributed weights to examine the formation and development of alternative load paths over a local failure. The obtained experimental data then are used to validate LS-Dyna numerical models, which enable a parametric study on the collapse resistance of flat slab structures with several variables of interest, including the aspect ratio of slab panels, the locations of initial column failure, the concrete strength and slab reinforcement ratios. It is numerically shown that the aspect ratio has significant effects on the collapse behaviour with the highest collapse resistance attributed to the flat slab with square panels. Meanwhile, the corner column loss is the most critical scenario leading to a structural collapse.
Anh Kim Do; Tan Ngoc Nguyen; Cuong Quoc Tran; Hieu Trung Nguyen; Dat Xuan Pham. Experimental and numerical investigations on the collapse behaviour of RC flat slab structures. Asian Journal of Civil Engineering 2021, 22, 1143 -1155.
AMA StyleAnh Kim Do, Tan Ngoc Nguyen, Cuong Quoc Tran, Hieu Trung Nguyen, Dat Xuan Pham. Experimental and numerical investigations on the collapse behaviour of RC flat slab structures. Asian Journal of Civil Engineering. 2021; 22 (6):1143-1155.
Chicago/Turabian StyleAnh Kim Do; Tan Ngoc Nguyen; Cuong Quoc Tran; Hieu Trung Nguyen; Dat Xuan Pham. 2021. "Experimental and numerical investigations on the collapse behaviour of RC flat slab structures." Asian Journal of Civil Engineering 22, no. 6: 1143-1155.
This paper presents an experimental program for assessing several physical and mechanical properties of self-compacting concrete (SCC) that was manufactured and cured in hot climate conditions. Two SCC mixtures were tested incorporating either OPC or slag cement. The slump-flow which was maintained constant whatever the initial temperature to be 20 or 50 °C by the addition of water at the end of mixing. SCC properties such as compressive strength, water porosity and shrinkage were determined on the cylindrical specimens of 11 × 22 cm. The obtained results on SCC mixed in hot temperature (50 °C) and relative to the control mixture (20 °C) showed that (i) concrete compressive strength is not altered with increasing the initial temperature, (ii) SCC with OPC/filler/slag presents better performances than OPC/filler based SCC.
Vinh An Le; Ngoc Tan Nguyen; Xuan Cay Bui; Tuan Anh Bui. Strength, Water Porosity and the Shrinkage of Self-Compacting Concrete in Hot Climate. Lecture Notes in Civil Engineering 2021, 183 -188.
AMA StyleVinh An Le, Ngoc Tan Nguyen, Xuan Cay Bui, Tuan Anh Bui. Strength, Water Porosity and the Shrinkage of Self-Compacting Concrete in Hot Climate. Lecture Notes in Civil Engineering. 2021; ():183-188.
Chicago/Turabian StyleVinh An Le; Ngoc Tan Nguyen; Xuan Cay Bui; Tuan Anh Bui. 2021. "Strength, Water Porosity and the Shrinkage of Self-Compacting Concrete in Hot Climate." Lecture Notes in Civil Engineering , no. : 183-188.