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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.
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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.
Title: Compaction and Lightweight SFRC Mine Cribs
Author(s): Antonio Nanni, Charles L. Corbitt, and Michael K. Phang
Publication: Special Publication
Appears on pages(s): 351-366
Keywords: compacting; cribbing; fiber reinforced concretes; metal fibers; lightweight aggregate concretes; mines (excavations); roofs; supports; Structural Research
Abstract:Use of steel fiber reinforced concrete (SFRC) in mine roof support systems as a substitute of traditional wood construction has proven successful. Further improvements of this technology could be obtained using SFRC crib-blocks either consolidated by compaction or having a lightweight matrix. Test results indicate that both compacted and lightweight SFRC crib-blocks behave similarly to conventional SFRC construction, as reported in the literature. Half-scale crib models have a load-bearing strength of approximately 50 percent, the 28-day ultimate compressive strength of quality control specimens. The proposed compaction method has the advantages of decreasing portland cement content, relaxing aggregate gradation requirements, and easing fabrication. On the other hand, the use of lightweight aggregates in the conventional construction procedure facilitates product hauling and handling without impairing structural integrity.
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