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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 109 Abstracts search results
Document:
23-055
Date:
February 8, 2024
Author(s):
Sangyoung Han, Thanachart Subgranon, Hung-Wen Chung, Kukjoo Kim, Mang Tia
Publication:
Materials Journal
Abstract:
A compressive laboratory testing program, field testing program, numerical analysis, and life-cycle cost analysis were conducted to evaluate the beneficial effects of incorporating shrinkage-reducing admixture (SRA), polymeric microfibers (PMF), and optimized aggregate gradation (OAG) into an internally cured concrete (ICC) mix for rigid pavement application. Results from the laboratory program indicate that all ICC mixes outperformed the standard concrete (SC) mix. All ICC mixes showed a decrease in drying shrinkage compared to the SC mix. Based on the laboratory program, three ICC mixes and one of the SC mixes were selected for the full-scale test subjected to a heavy vehicle simulator for accelerated fatigue testing. Extensive testing and analysis have shown that ICC mixes incorporating SRA, PMF, and OAG can be beneficially used in pavement applications to achieve increased pavement life.
DOI:
10.14359/51740564
21-381
December 1, 2023
Othman AlShareedah and Somayeh Nassiri
Volume:
120
Issue:
6
Pervious concrete is a stormwater management practice used in the United States, Europe, China, Japan, and many other countries. Yet the design of pervious concrete mixtures to balance strength and permeability requires more research. Sphere packing models of pervious concrete were used in compressive strength testing simulations using the discrete element method with a cohesive contact law. First, three mixtures with varied water-cement ratios (w/c) and porosities were used for model development and validation. Next, an extensive database of simulated compressive strength and tested permeability was created, including 21 porosities at three w/c. Analysis of the database showed that for pavement applications where high permeability and strength are required, the advised porosity is 0.26 to 0.30, producing average strengths of 14.4, 11.1, and 7.7 MPa for w/c of 0.25, 0.30, and 0.35. The model can guide the mixture design to meet target performance metrics, save materials and maintenance costs, and extend the pavement life.
10.14359/51739157
21-493
January 1, 2023
M. Selvam and Surender Singh
1
Lack of understanding of the compaction mechanism, both in the laboratory and field, could result in significant underestimation or overestimation of the roller-compacted concrete pavement (RCCP) performance. The literature (1987 to 2022) depicts that there are numerous techniques to design RCCP in the laboratory; however, which method could closely simulate the field compaction is not fully explored. The present paper critically reviews the fundamental parameters affecting the strength characteristics of RCCP when compacted with different compaction mechanisms in the laboratory and attempts to rank the compaction methods based on the field performance. Also, recommendations are made on how to fabricate the specimens without having much impact on the considered compaction technique. The techniques that have been considered are the vibratory hammer, vibratory table, modified Proctor, gyratory compactor, and special compactors such as California kneading compactor, Marshall hammer, and duplex roller. Based on the present review, future research prospects are outlined to improve the performance of RCCP.
10.14359/51737290
22-105
Tsuneji Sasaki, Hiroshi Higashiyama, and Mutsumi Mizukoshi
Beam specimens of polypropylene fiber-reinforced concrete (PPFRC) with 1.3 vol. % having three different sizes, 100 x 100 x 400 mm, 150 x 150 x 530 mm, and 200 x 200 x 650 mm, were tested under four-point bending tests to investigate the flexural behavior (flexural and post-cracking strengths). The beam specimens were quarried from PPFRC slabs to evaluate the influence of the fiber orientation and distribution and the concrete casting and loading directions on the flexural behavior. The test results show that the difference in the fabrication methods of specimens considerably affected the flexural behavior. The flexural cracking strength was accompanied by the size effect and the post-cracking strength, significantly decreased when compared with standardized prism specimens; however, the post-cracking strength was not sensitive to the size effect. Furthermore, the pavement thickness of PPFRC was compared with that of plain concrete with the calculation using the post-cracking strength.
10.14359/51737294
21-509
November 1, 2022
Richard A. Deschenes, Ali Qutail, and Romit Thapa
119
Monitoring alkali-silica reaction in pavements requires methods to quantify strain and deterioration. Typically, surface strain is measured using a detachable mechanical gauge, while deterioration features are measured following the damage rating index (DRI). External restraint from adjacent pavement or subgrade friction potentially affects strain and deterioration in the travel, transverse, and vertical directions differently, potentially decreasing deterioration in the restrained directions. Limited experimental data are available regarding states of stress observed in concrete pavements. The objective of this study was to evaluate the potential redistribution of strain and deterioration toward the unrestrained direction (vertical). Herein, surface strain and DRI methods were used to quantify and compare deterioration in restrained and unrestrained concrete cube specimens with self-reacting external restraint. The results were compared to previous studies to validate the findings. External restraint was found to limit strain and deterioration in the restrained directions, with a lesser effect on the unrestrained directions.
10.14359/51735981
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