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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 91 Abstracts search results
April 1, 2020
Maria Kaszynska and Adam Zielinski
The research paper presents an analysis of autogenous shrinkage development in self-consolidating concrete (SCC). The first stage of the study involved an evaluation of concrete susceptibility to cracking caused by shrinkage of SCC with natural and lightweight aggregate. The shrinkage was tested on concrete rings according to ASTM C 1581/C 1581M- 09a. The influence of aggregate composition, the water content in lightweight aggregate, and SRA admixture on the reduction of concrete susceptibility to cracking, due to the early-age shrinkage deformation was determined. In the second stage of the research, the innovative method measurement of autogenous shrinkage was developed and implemented. The tests were performed on concrete block samples, dimensions 35x150x1150 mm, that had the same concrete volume as ring specimen in the ASTM method. Linear deformation of the concrete samples was measured in constant periods of 500 s using dial gauges with digital data loggers. The investigation allowed evaluating of the influence of water/cement (w/c) ratio of 0.28, 0.34, 0.42, and of aggregate composition on the development of autogenous shrinkage in different stages of curing SCC. The results were compared to existing material models proposed by other researchers. The conducted study indicated a significant influence of the w/c ratio and composition of aggregate on the concrete susceptibility to crack caused by the autogenous shrinkage deformation.
October 1, 2019
Junwon Seo and Jharna Pokhrel
This paper investigates the effects of material constituents on fresh and hardened properties of Self-Consolidating Concrete (SCC) mixture necessary for efficient prestressed bridge girder fabrication using a surrogate modeling technique. Response surface methodology (RSM)-based surrogate models consisting of input parameterssuch as density of coarse and fine aggregate were created based upon the past laboratory testing results for differentSCC mixture trials. These models were used to estimate various SCC material characteristics, including slump flow, J-ring flow, passing ability, filling capacity, Visual Stability Index (VSI), T50 (concrete spread time to reach the 50.8
cm [20 in] mark), column segregation, 16-hour compressive strength, and 28-days compressive strength, while examining the correlation between the input parameters on each material characteristic. To observe the effect of core input parameters in an efficient manner, 2D contour plot and 3D surface plot for material characteristics were also created. Then, statistical analyses with the testing results were performed to determine the accuracy of the surrogate models in terms of coefficient of regression (R2). Most of the R2 values are higher than 90%, indicating a higher degree of correlation among the testing and surrogate data. Average predicted-to-measure ratios of the surrogate models were almost equal to or slightly greater than 1.00, showing good agreement with the testing results, and
specifically, the surrogate and testing values for J-ring flow and 28-days compressive strength were nearly identical. Key findings indicate that the coarse aggregate content significantly affected the characteristics of the SCC mixtures.
September 30, 2019
Yasser Khodair, Arif Iqbal, and Mohammed Hussaini
This study discusses the results of an experimental program conducted to study the fresh, hardened and unrestrained shrinkage characteristics of self-consolidating concrete (SCC)
using fine recycled asphalt pavement (FRAP) and high volume of supplementary cementitious materials (SCMs) including class C fly-ash (FA) and slag (S). Sixteen mixtures were prepared
with different percentages of FA, S, and FRAP. SCC mixtures were divided into four groups where each group had a different percentage of FRAP replacing fine aggregate (10%, 20%, 30%, 40%) and Portland cement being replaced by different percentages of SCMs. The water to cementitious material (w/cm) ratio of 0.4 was used for SCC mixtures with a target slump flow higher than 500 mm. The flowability, deformability, filling capacity and resistance to segregation were measured to determine the fresh properties of the mixtures. Moreover, the compressive strength at 14, 28, and 90 days and split tensile strength at 28 days were determined
and durability characteristics including unrestrained shrinkage up to 90 days were tested. Analysis of experimental data showed that most of the mixtures satisfied the SCC fresh
properties requirements. The addition of FRAP had an adverse effect on the compressive, tensile strength and unrestrained free shrinkage of SCC mixtures.
November 1, 2018
Slamah S. Krem and Khaled A. Soudki
Self-consolidating concrete (SCC) is an emerging technology that provides improved productivity and quality of concrete construction. The current ACI 440.4R-04 design guideline does not account for SCC in the calculation of the transfer and development lengths of prestressed CFRP bars. Recent developments in the FRP bar manufacturing process can significantly affect the bond behavior of FRP bars in concrete. This paper presents measurements from 16 beams prestressed with 12.7 mm (½̏) CFRP bars. Transfer length was determined through longitudinal concrete strain profile and draw-in measurements, and development length was determined by flexural tests. The results revealed a nonlinear variation in the transfer length of CFRP bars in SCC versus the prestressing level. Prediction of the transfer and development length predictions for the 12.7 mm (½̏) CFRP bar based on ACI 440.4R-04 are unconservative when the prestressing level exceeds 750 MPa (110 ksi). The paper proposes a modification to the existing ACI 440.4R-04 equation to account for SCC. At a 90 % confidence interval, the test results show an average deviation of ± 8 % for the proposed model.
September 26, 2018
Josephine Cheung, Elizabeth Burns, Joshua Curto, and Nathan Tregger
The production of sustainable building materials, such as concrete, has drawn increasing attention in the last decade. Breakthroughs in the development of new admixtures, optimized mix designs, innovative concrete management systems, together with a deeper understanding of the best-mode usage of admixtures with different cementitious materials have resulted in the production of sustainable concrete with better performance at a lower cost. This paper presents three approaches for producing sustainable concrete: (1) introduction of a new class of admixture systems that produce control flow concrete or concrete with flow characteristics of self-consolidating concrete (SCC) without using high cement content, (2) minimization of polycarboxylate ether/ester (PCE) and cement usage through better understanding of the interaction between PCEs and sulfates and (3) use of in-transit concrete management systems (iCMS) to consistently deliver concrete that will meet desired specifications with minimal over-design.
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