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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 54 Abstracts search results
Document:
22-356
Date:
September 1, 2023
Author(s):
Zhao-Dong Xu, Yi Zhang, Jin-Bao Li, Xing-Huai Huang, and Ying-Qing Guo
Publication:
Materials Journal
Volume:
120
Issue:
5
Abstract:
The slotting method is a nondestructive detection method based on the stress release principle to evaluate in-place stress in concrete. By measuring the change in strain of the slotting area using a strain gauge, the in-place stress within the concrete member can be calculated by elastic theory. This paper proposes a multi-step slotting method that combines experimental strain measurements with numerical simulation results. For concrete specimens under unidirectional stress, the effects of compressive stress, slotting spacing, slotting length, and slotting depth on the degree of stress release were analyzed using finite element analysis, and a normalized fitting equation was proposed that can be quickly and accurately applied in engineering detection. The excellent agreement between the experimental results and the numerical simulation (fitted equation) results shows that the slotting method can facilitate the accurate evaluation of the in-place stress in concrete, and the relative error can be reduced to less than 10% when it is calculated using the optimized multi-step experimental data.
DOI:
10.14359/51738893
22-201
March 1, 2023
Y. Wang, K. Bharadwaj, H. S. Esmaeeli, P. Zavattieri, O. B. Isgor, and W. J. Weiss
2
This paper describes an approach to predict the mechanical and fracture behavior of cement-based systems by combining thermodynamic and finite element analysis models. First, the reaction products in a hydrated cementitious paste are predicted using a thermodynamic model. Second, a pore partitioning model is used to segment the total porosity into porosity associated with gel pores and capillary pores. A property-porosity relationship is used to predict the elastic modulus, tensile strength, and fracture energy of the hardened cement paste. The paste’s modulus, fracture energy, and tensile strength, along with information on the aggregate properties and interfacial transition zone properties, are used as inputs to a finite element analysis model to predict the flexural strength and fracture response of mortars.
10.14359/51738493
21-360
September 1, 2022
F. Dabbaghi, A. Tanhadoust, M. L. Nehdi, M. Dehestani, H. Yousefpour, and H.-T. Thai
119
Structural lightweight-aggregate concrete (LWAC) has gained a broad range of applications in the construction industry owing to its reduced dead load and enhanced fire resistance. In this study, the potential of using lightweight expanded clay aggregates as a partial replacement for fine and coarse natural aggregates was experimentally and numerically examined. Testing was performed on cylindrical specimens made of normalweight and lightweight concrete incorporating microsilica as a partial replacement for cement to determine the associated stress-strain behavior. Subsequently, three-point bending testing was conducted on reinforced concrete beams to evaluate their structural behavior. Four levels of temperature were considered: 25°C (ambient temperature), and 250, 500, and 750°C (elevated temperatures). The finite element method through Abaqus software was deployed to numerically investigate the behavior at elevated temperatures through a comprehensive parametric study. The experimental and numerical results indicate that under high-temperature exposure, LWAC outperforms its normal counterpart in terms of strength, stiffness, and Young’s modulus. It is also noticeable that LWAC beams retained their load-bearing capacity better than normal weight aggregate concrete (NWAC) after reaching the peak load.
10.14359/51736093
19-458
March 1, 2022
Anuruddha Jayasuriya, Matthew J. Bandelt, and Matthew P. Adams
This paper investigates the applicability of numerically generated recycled concrete aggregate (RCA) systems by varying the material properties. The methodology was adopted by using a computational algorithm that can generate concrete systems with different RCA replacement levels to numerically simulate recycled aggregate concrete (RAC) systems under mechanical loading. Numerically simulated results are compared with an experimental database that has been established, including a substantial data set on RAC mixture design proportions. RAC geometries and material properties were stochastically generated using Monte Carlo simulation methods, resulting in 200 representative numerical models that were subjected to simulated mechanical loading. The overall variability of the concrete properties was not well-predicted in the numerical models compared to the experimental database results due to modeling limitations and material heterogeneity exhibited in experiments. The variability of tensile strength was governed by the complex strain localization patterns in the interfacial transition zone (ITZ) phases in RAC systems that were simulated.
10.14359/51734483
20-416
January 1, 2022
B. S. Sindu and Saptarshi Sasmal
1
An attempt has been made to develop hierarchically crack-abridged, strain-hardened cementitious composite by judiciously incorporating hybrid fibers of three distinctly different length scales (nano-, micro-, and continuous fibers). Unlike textile-reinforced cement composites, here, the nano- to macrofibers are used to improve the cementitious matrix properties through appropriate crack bridging, and at the macroscale, only onedimensional (1-D) long fibers/yarns are used. A distinct and categorical improvement in the property(ies) is found to take place at each scale of bridging. The structural composite systems made using the developed composite exhibited very promising properties, such as high strength (flexural) of approximately 20 MPa (2.90 ksi), an ultimate strain of 8000 με, and rotational capacity of approximately 10 degrees. A detailed numerical model is developed to carry out nonlinear finite element analysis where the interface properties, strain state, and so on are the parameters. Finally, a constitutive model is proposed for the developed composite through inverse analysis. The proposed constitutive model will help engineers design structural components/retrofit schemes by employing the developed composite without complex analysis (using smeared properties).
10.14359/51734193
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