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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 175 Abstracts search results
March 1, 2021
Ablam Zidol, Monique T. Tognonvi, and Arezki Tagnit-Hamou
It has been demonstrated in recent studies that, unlike general-use
cement (GU), glass powder (GP) performs better in concrete mixtures with high water-binder ratios (w/b) in terms of both mechanical properties and chloride ion permeability. This paper aims to deepen investigations on the behavior of concrete incorporating GP in aggressive outdoor environments such as chloride ion diffusion, carbonation, and sulfates as a function of w/b. For comparison purposes, concretes containing conventional supplementary cementitious materials (SCMs) such as Class F fly ash (FFA) and ground-granulated blast-furnace slag (GGBFS) along
with control concrete were also studied. In general, GP-based concretes behaved as those containing SCM. Indeed, despite their high w/b, concrete incorporating GP better withstands sulfate attack than the reference. This was mainly attributed to the low chloride permeability of such concretes. Also, as commonly observed with SCM concretes, carbonation was higher with GP-based concrete and increased with w/b.
M. R. Sakr and M. T. Bassuoni
The response surface method, a statistical modeling approach, was used to assess the influence of water-binder ratio (w/b), binder content, and dosages of supplementary cementitious materials on the performance of 52 mixtures under accelerated physical salt attack (PSA). The test protocol simulated partially embedded elements. Also, the PSA damage of concrete was mapped by regression analysis based on combination of performance-based parameters. Mineralogical, thermal, and microstructural analyses were conducted to elucidate the bulk trends obtained from the models. Multi-objective optimization was also performed to determine optimal combinations of parameters (w/b; binder content; and dosages of fly ash, slag, and silica fume) producing mixtures resistant to PSA. In addition, a classification for the resistance of concrete to PSA based on performance indicators (mechanical capacity and wicking factor) was proposed.
January 1, 2021
Ângela Costa Piccinini, Luiz Carlos Pinto da Silva Filho, and Américo Campos Filho
This research evaluated the bond behavior of reinforcement and the mechanical characteristics in a reactive powder concrete (RPC) replacing 35% cement with blast-furnace slag. Pullout tests were performed at the ages of 3, 7, 28, 56, 63, and 91 days on cylindrical samples. The embedded length used was double the diameter of the bar. At 3 days it presented compressive strength of 41% of the maximum obtained, which was 123.06 MPa at 91 days. There was an increase in strength until the age of 56 days and after stabilization of the curves. In pullout tests, it was noticed the considerable influence of the rib, because in tests with plain bars, the bond force was below 20% of the results with ribbed bar, which reached 54.38 MPa of strength. The compression curve was similar to the bond curve. Underestimated values were observed when the researchers’ equations were applied to calculate the maximum bond strength.
M. Almarshoud, H. Mosavi, R. Alrashidi, M. H. M. Alyami, C. C. Ferraro, H. D. DeFord, and K. A. Riding
In this study, the concrete penetrability properties were measured for both the older test methods and the new resistivity-based test methods. To consider different materials, four types of cement were used, including an ASTM C150/C150M Type I/II low alkali cement, Type V cement, Type I cement with high alkali content, and an ASTM C595/C595M Type IL cement. Silica fume, slag cement, Class F fly ash, and metakaolin were used as supplementary cementitious material (SCM) in binary and ternary blends with different replacement ratios to evaluate the correlation between electrical and transport properties. The tests included AASHTO TP 119 for bulk resistivity, AASHTO T 358 for surface resistivity measurement, rapid chloride permeability test (ASTM C1202/C1202M), rapid chloride migration test (NT Build 492), concrete water absorption rate (ASTM C1585/C1585M), concrete volume of permeable voids (ASTM C642/C642M), and a constant-head water permeability test. The results showed good correlation between the electrical-based tests and water permeability, but poor correlation between the electrical-based tests and the volume of permeable voids.
November 1, 2020
Job Thomas, Ardra Mohan, and Dhannya K. K.
In this study, copper slag and lime-activated fly ash were used for the manufacturing of cold-bonded aggregates. Cold-bonded copper slag fly ash (CSFA) aggregates were manufactured by varying copper slag content. The aggregate type with 37.5% copper slag and 62.5% fly ash showed optimum strength properties and was selected for the production of CSFA aggregate concrete. The strength and durability properties of concrete with a varying replacement ratio of CSFA aggregate from 0 to 100% at normal temperature and at elevated temperatures of 200, 400, and 600°C were investigated. The results show that concrete containing CSFA aggregate can be ideally used as a construction material up to a temperature of 400°C and as 100% replacement for coarse aggregate. A prediction model has been formulated using multiple regression analysis for the mechanical strength properties of concrete at different replacement ratios and exposure temperatures. A mixture design methodology is also proposed for the concrete containing CSFA aggregates.
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