Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
Staff Directory
ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701
ACI Middle East Regional Office Second Floor, Office #207 The Offices 2 Building, One Central Dubai World Trade Center Complex Dubai, UAE Phone: +971.4.516.3208 & 3209
ACI Resource Center Southern California Midwest Mid Atlantic
Feedback via Email Phone: 1.248.848.3800
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 60 Abstracts search results
Document:
SP356_02
Date:
October 1, 2022
Author(s):
Nafiseh Kiani, Steven Nolan, and Antonio Nanni
Publication:
Symposium Papers
Volume:
356
Abstract:
A common challenge in reinforced concrete construction is the need to connect bars of finite length to provide reinforcement continuity. Lap and mechanical splices are common methods that have been used to make continuous reinforcement. Lap splicing may cause additional congestion making concrete consolidation difficult. Mechanical splices are used when lap splicing is not practical. Different types of mechanical splices are commercially available for steel bars. For the case of GFRP reinforcement, mechanical splices are very useful in staged construction because the reinforcement cannot either be bent at the site or there is insufficient space for lap splicing. Mechanical splices for GFRP bars, however, must account for the low transverse stiffness and strength of the bars. For these reasons, only certain mechanical splices are practical for GFRP bars and careful consideration must be given to their installation and effectiveness. In this study, a commercially available swaged coupler was selected to investigate the behavior of spliced GFRP bars. Expected performance was numerically evaluated using a Finite Element (FE) model to develop a framework for test validation. The FE model was calibrated with a laboratory test to compare the results. The coupler’s length, the bar’s tensile strength, and the slip between the coupler and the bar were investigated. The outcome of this study allows for the definition of an efficient test campaign.
DOI:
10.14359/51737244
SP-349_37
April 22, 2021
O. Ahmadah, H. Bessaies-Bey, A. Yahia, and N. Roussel
349
Low environmental impact binders, in which clinker is partially substituted by less reactive powders, are used in proportioning low water-to-cement ratios mixtures to ensure higher compactness, low porosity and improved mechanical as well as durability properties. The use of relatively high solid volume fractions dramatically affects the workability of the mixture and affects its ease of placement and consolidation. Various superplasticizer types have been investigated in literature to control the rheological properties, although these admixtures considerably decrease the yield stress values, their effect on viscosity is moderate. The main objective of this investigation is to control the rheology of ternary cements by controlling the morphology of particles, which is the key parameter affecting the rheology of cementitious suspension. The test results on LC3 (i.e. 55% Portland cement + 30% calcine clay + 15% Limestone) and CEM II/B-M (S-LL) (i.e. 65% Portland cement + 20% Slag + 15% Limestone) ternary binders revealed that the optimization of the particlesize distribution and the maximum packing fraction of the powders leads to a considerable decrease of both viscosity and yield stress by 20% and 50%, respectively.
10.14359/51732770
SP-336_07
December 11, 2019
David Darwin, Rouzbeh Khajehdehi, Muzai Feng, James Lafikes, Eman Ibrahim, Matthew O’Reilly
336
The goal of this study was to implement cost-effective techniques for improving bridge deck service life through the reduction of cracking. Work was performed both in the laboratory and in the field, resulting in the creation of Low-Cracking High-Performance Concrete (LC-HPC) specifications that minimize cracking through the use of low slump, low paste content, moderate compressive strength, concrete temperature control, good consolidation, minimum finishing, and extended curing. This paper documents the performance of 17 decks constructed with LC-HPC specifications and 13 matching control bridge decks based on crack surveys. The LCHPC bridge decks exhibit less cracking than the matching control decks in the vast majority of cases. Only two LCHPC bridge decks have higher overall crack densities than their control decks, which are the two best performing control decks in the program, and the differences are small. The majority of the cracks are transverse and run parallel to the top layer of the deck reinforcement. The results of this study demonstrate the positive effects of reduced cement paste contents, concrete temperature control, limitations on or de-emphasis of maximum concrete compressive strength, limitations on maximum slump, the use of good consolidation, minimizing finishing operations, and application of curing shortly after finishing and for an extended time on minimizing cracking in bridge decks.
10.14359/51722459
SP-332_08
July 1, 2019
Ashok Kakade
332
When preparing ready-mix concrete for private applications, it is typically recommended that owners and contractors collaborate with suppliers and concrete specialists to understand the possibilities and limitations of concrete in their applications. Here, we describe a situation in which a homeowner took direct control over the exact specifications of concrete and admixtures, and ultimately resulted in an unsatisfactory concrete slab. The owner subsequently sued and settled with the concrete supplier outside of the court, which raises important questions regarding who maintains responsibility for concrete mixtures, their installation, and the final slab results. Suggestions are provided to help mitigate this problem.
10.14359/51719127
SP304-06
October 27, 2015
E.S. Hernandez, and J.J. Myers
304
Self-consolidating concrete (SCC), as defined by ACI 237R-07, is a very flowable, non-segregating concrete that can spread into placed, fill the formwork and encapsulate the reinforcement without any mechanical consolidation. SCC, compared to traditional concrete mixtures, has primary benefits that include a reduction in equipment and labor associated costs as well as higher construction effectiveness. Innovative materials such as high volume fly ash concrete (HVFAC), represent a substantial advantage to producing stronger, more durable cast-in-place (CIP) concrete members. A level of 50% fly ash to cement proportion, as well as both normal strength self-consolidating concrete (NS-SCC) and high strength self-consolidating concrete (HS-SCC), were employed in the implementation project for Missouri Bridge A7957. The objective of this research was to provide an implementation test bed and showcase for the use of these materials. The serviceability and structural performance, both short-term and long-term, of the concrete members within the bridge were monitored in an effort to investigate the in-situ performance of not only SCC but also HVFAC. The initial instrumentation program consisted of obtaining the temperature, strain, and deflection data for the different components within the bridge’s structure, from casting through service conditions. The results obtained from this two-year monitoring program will lead to propose certain specification requirements that can be used for future project implementations.
10.14359/51688556
Results Per Page 5 10 15 20 25 50 100