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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 14 Abstracts search results
March 1, 1978
John C. Fredericks, N. R. Saunders, and John T. Broadfoot
Describes recent development of two entirely different types of positive displacement pumps which make it possible to convey and success-fully apply wet-mix shotcrete at 1/2- to 2-in. slump. Details of mixes used with both the squeeze pump and the piston pump are given.
M. J. Dykmans
Recommended mix proportions and application techniques for floors, walls, and domes of shotcrete tanks are presented. Special practices required to assure a dense covering of shotcrete over prestressing wires are explained. Pre-ferred techniques for proper water curing of shotcrete are emphasized.
T. A. Hoffmeyer
Defines wet-mix shotcrete and describes both positive feed and pneumatic feed equipment for delivering the mix. Gunning techniques and the solution of rebound problems are also discussed. Preconstruction mock-ups helped solve production problems in wet-mix shotcreting of a large folded plate roof for a church, indicating a need to combine cast concrete with shotcrete. Successful bonding at the construction joints is described. Comparative data on cost and properties of wet-mix shotcrete and cast concrete are given.
Oswin Keifer, Jr.
Multiple layers of shotcrete were
Albert Litvin and Joseph J. Shideler
Several contractors and equipment manufacturers gunned test panels of both wet-and dry-process shotcretes and shipped them to the laboratory for testing. Commercial testing laboratories also sampled the freshly gunned material at the fabrication site and determined mix proportions, unit weight, air content, and gradation of the aggregate. Other mixes with a wider range of mix proportions, water-cement ratios, and aggregate size were gunned and tested in the laboratory. Data on compressive strength, modulus of elasticity, drying shrink-age, creep, absorption, resistance to freezing and thawing, and water permeability for the various samples are reported.
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