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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
Document:
SP14-13
Date:
March 1, 1978
Author(s):
Albert Litvin and Joseph J. Shideler
Publication:
Symposium Papers
Volume:
14
Abstract:
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.
DOI:
10.14359/6813
SP14-12
Stanley G. Zynda
Proportions of shotcrete mortar as mixed are compared with proportions of the mix in place. Effect of nozzle velocity on density of the in-place material is explained. Data on unit weight and compressive strength of various mixes are given, noting how test results based on shot cylinders differ from strength tests of cores from actual structural applications. Total water content for any given com-bination of shotcrete mortar materials is constant regardless of mix proportions, provided that the material is placed at the wettest stable consistency-the point of incipient sag. Maximum density in any mix occurs at this water content; hence it is also the point of maximum compressive strength.
10.14359/6812
SP14-11
E. C. Tinsley and H. L Kalousek
Castable refractories can be suc-cessfully applied by gunning. The dry-mix method is generally considered superior to wet-mix. Proper proportioning of appropriate mix ingredients, careful predampening techniques, and thorough mixing before charging the dry-gun equipment are essential to obtaining high quality and uniformity of the material in place. Properties of gunned and cast refractories are compared, and effect of varying amounts of predampening water is noted. Recommendations cover proportioning and application techniques, selection of appropriate nozzles, and adaptations nec-essary for hot patching.
10.14359/6811
SP14-10
Phlip D. Barnard and Robert E. Tobin
Shotcretes weighing 90 to 120 lb per cu ft with compressive strength from 2500 to 6000 psi may be produced using fine expanded clay or shale aggregates. Economic factors influencing selection of this material are discussed, and engi-neering data necessary for design are presented. Properties of the lightweight aggregates used and proportioning of the shotcrete mix are explained. The authors also cover equipment and construction methods for applying, controlling rebound, finishing, curing, and testing the lightweight material. Construction applications in the United States are cited.
10.14359/6810
SP14-09
Francis X. Crowley
Noting the developments in the history of prestressed shotcrete tanks, the author emphasizes current practice for shotcreted prestressed tanks with steel diaphragms. The entire construction sequence from site preparation to surface finishing of the completed tank is described, including: floor construction followed by placing one of three types of floor-wall joints; erection and sealing of the steel diaphragm; shotcreting inside and outside core walls against. the diaphragm; constructing the wall-dome joint, erecting formwork, and shooting the dome; winding the prestressing wire; shooting the cover coat; and finally backfilling and finishing. Four rules for shooting a successful cover coat that will protect wire against corrosion are given, and use of test specimens cut from gunned panels is recommended.
10.14359/6809
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