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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:
SP14-02
Date:
March 1, 1978
Author(s):
Theodore R. Crom
Publication:
Symposium Papers
Volume:
14
Abstract:
Describes the techniques of dry-mix shotcreting. Cements and aggregates for shotcrete are reviewed. Basic types of equipment manu-factured in the United States are discussed, and their operation is explained, including details of the nozzleman’s work. Sand pockets are defined, and reasons for avoiding such imperfections are given. Recommendations on the use, size, and proper en-casement of reinforcing steel are made. Bonding ability, curing, finishing, and acceptable weather conditions for shotcreting are considered. Comments are given regarding compressive strength testing and qualification of nozzlemen.
DOI:
10.14359/6802
SP14-01
T. J. Reading
Defines both wet-mix and dry-mi shotcrete, and reports on its generally satisfactor performance in widely varied applications. Shotcrete is well adapted to thin, lightly reinforced concrete sections in new construction, as well as for repairs and thin overlays. In spite of a high cost per cubic yard, it is frequently more economical than conven-tional concrete for such purposes. Results of the Committee 506 questionnaire sent to shotcrete users are reported, including data on extent of use, performance, and causes of unsatisfa-tory performance. Poor workmanship is the most fre-quently reported cause of shotcrete failures. Noting that sampling and testing procedures must be quite different from those for conventional concrete, em-phasis is placed on test sections gunned under field conditions.
10.14359/6801
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
SP14-08
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.
10.14359/6808
SP14-04
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.
10.14359/6804
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