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
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.
ACI World Headquarters
38800 Country Club Dr.
Farmington Hills, MI
ACI Middle East Regional Office
Second Floor, Office #207
The Offices 2 Building, One Central
Dubai World Trade Center Complex
Phone: +971.4.516.3208 & 3209
ACI Resource Center
Feedback via Email
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 34 Abstracts search results
July 1, 2022
Charles Nmai, Chris Eagon, John Luciano
In the late 1980s, an innovative hydration-stabilizing admixture was introduced to help concrete producers effectively extend the working time of fresh concrete mixtures for challenging applications, particularly, in hot weather or long time-to-discharge applications. The hydration-stabilizing admixture also provided concrete producers with a means of managing returned concrete to address environmental issues associated with concrete waste. In recent years, admixtures that allow concrete producers to convert returned concrete into a very low-strength granular material that can be used for construction backfill, road base, or in other applications have been introduced. Together with the hydration-stabilizing admixture, concrete producers can now use chemical admixtures to significantly reduce concrete waste. In this paper, the operational and sustainability benefits of the hydration-stabilizing admixture and a new one-component engineered polymer admixture that facilitates the beneficial reuse of returned fresh concrete are presented and discussed.
March 1, 2020
Oscar R. Antommattei
During hot weather concreting, contractors have several options for dealing with slump loss and rapid
drying of concrete surfaces. Limiting slump loss requires cooperation between the concrete producer and contractor,
especially with respect to reducing truck waiting time. Several options for minimizing surface drying are compared,
based on effectiveness and cost. Finally, providing for adequate initial curing of concrete test cylinders can reduce
the possibility of schedule delays and increased costs related to low strength-test results.
July 1, 2019
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.
March 1, 2011
Amr El-Ragaby and Ehab F. El-Salakawy
The bridge deck slab is a prime example where FRP bars are used as main concrete reinforcement. In Canada, bridge deck slabs are usually subjected to a variation of cold and hot weathering while directly sustain the traffic loads. Both fatigue and thermal loading are expected to adversely affect the overall performance of such structural elements. In this research, a total of 4 large-scale bridge deck slabs totally reinforced with glass FRP bars were constructed and tested under simulated long-term loading and environmental conditions. The slabs were subjected to 3,000,000 cycles of sinusoidal waveform fatigue loading combined with either 100 freeze-thaw cycles or continuous cold temperature for one month. The test parameters included the environmental conditioning and the reinforcement ratio. It was concluded that the overall behavior of GFRP-reinforced bridge deck slabs after being subjected to simulated long-term fatigue load cycles and freeze-thaw or cold temperature is satisfactory according to the current design codes.
July 31, 2008
E. Moreno, R. Solís-Carcaño, and C. Serrano-Zebadua
The weather of the Yucatan Peninsula is classifi ed as hot sub-humid,
with minor differences of relative humidity and temperature during the year. Local builders, in their search for process optimization and cost reduction, usually do not cure concrete beyond wetting the concrete surface immediately after removing the formwork. Teaching of concrete technology has been based on classic reports, where it is affi rmed that the strength gain is enhanced when moist curing is applied. Preliminary studies in the Yucatan region have not shown that moist curing helped to improve strength gain. Based on the meteorological conditions of the Yucatan region, it is possible that natural curing occurred with no need for additional curing for most of the cases. The objective of this study was to obtain the strength-gain curves as a
function of the moist curing time from 0 to 90 days. Preliminary results confirm the hypothesis about the suffi ciency of the natural curing under the weather conditions of the Yucatan region. The use of porous aggregate may have contributed to curing during storage in air.
Results Per Page
Please enter this 5 digit unlock code on the web page.