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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 10 Abstracts search results
Document:
SP260-09
Date:
June 1, 2009
Author(s):
Y. Shao and S. Wang
Publication:
Symposium Papers
Volume:
260
Abstract:
Carbonation curing of cellulose fiberboard made by slurry-dewatering process was studied to examine their CO2 uptake capability, immediate carbonation strength and long term strength after subsequent hydration. Influencing parameters on CO2 uptake and strength gain were discussed. They included compact forming pressure, drying time, drying temperature, carbonation duration, fiber/cement ratio and water/cement ratio. It was found that cement bonded cellulose fiberboards had excellent carbonation capacity. The percent carbon uptake ranged from 13.5 % to 23.6%, based on cement content and process conditions. High degree of carbonation significantly improved early age strength and had no detrimental effect on the subsequent hydration strength. To promote more CO2 uptake and higher strength gain, carbonation rate should be controlled. This can be achieved through system optimization. Carbonation curing has shown the potential to replace traditional autoclaving and gain technical, economical and environmental benefits.
DOI:
10.14359/56629
SP260-05
J. Jones
The paper discusses the variety of processes that are used to manufacture GFRC products. It also includes descriptions of how the processes have developed and the reasons for their development.
10.14359/56625
SP260-01
K.G. Kuder and S.P. Shah
The design versatility of cement-based composites continues to make them attractive for a variety of specialized applications. Advanced processing techniques, including the Hatschek process, extrusion, self-consolidating concrete and slipform-cast concrete paving, offer great promise for improving innovation in the modern construction world. However, to advance the state-of-theart of cement-based products, the fresh state characteristics of these materials need to be well understood. Processing has a significant impact on composite performance, affecting fresh and hardened state properties as well as overall cost. In spite of its importance, relatively little is known about the relationship between processing and composite performance. Recent work at the Center for Advanced Cement-Based Materials (ACBM), headquartered at Northwestern University, has focused on developing a better understanding of this critical relationship. The role of processing on composite performance has been examined for a variety of advanced processing techniques, including the Hatschek process, extrusion, self consolidating concrete and slipform-cast concrete paving. The results indicate that overall composite performance can be enhanced by controlling fresh state properties. This paper presents a review of these studies and discusses ongoing research to link composite performance to microstructural changes.
10.14359/56621
SP260
Editors: Yixin Shao and Ashish Dubey / Sponsored by: ACI Committee 549
This CD-ROM consists of papers that were presented at a session sponsored by Committee 549 at the Fall 2007 Convention in Fajardo, Puerto Rico. The objective of the symposium was to have a state-of-the-art review on the development of fabrication methods for cementitious products and explore their potential market opportunity in residential and industrial building applications. Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP-260
10.14359/56604
SP260-04
H. Ball Jr.
Typical demolding times of GFRC cast parts are typically 16 hours. This has limited the acceptance of GFRC, or any cement based product, into products requiring high volume production because of the high costs of multiple molds associated with a material chemistry with such long demolding times. This paper discusses a unique system utilizing Portland Type I cement, a fast setting cement and specially designed mixing equipment to process the material so that demolding times in the 1 to 2 hour range are possible. A conventional weight formula (128 pcf or 2048 kg/m3 ) and a lightweight formula (71 pcf or 1136 kg/m3) are available. For convenience, the formulas are supplied pre-blended.
10.14359/56624
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