Home > Publications > International Concrete Abstracts Portal


ABOUT THE 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.

International Concrete Abstracts Portal

Showing 1-5 of 14 Abstracts search results

Document: 

SP14-12

Date: 

March 1, 1978

Author(s):

Stanley G. Zynda

Publication:

Symposium Papers

Volume:

14

Abstract:

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.

DOI:

10.14359/6812

Document: 

SP14-08

Date: 

March 1, 1978

Author(s):

M. J. Dykmans

Publication:

Symposium Papers

Volume:

14

Abstract:

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.

DOI:

10.14359/6808

Document: 

SP14-04

Date: 

March 1, 1978

Author(s):

T. A. Hoffmeyer

Publication:

Symposium Papers

Volume:

14

Abstract:

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.

DOI:

10.14359/6804

Document: 

SP14-05

Date: 

March 1, 1978

Author(s):

John C. Fredericks, N. R. Saunders, and John T. Broadfoot

Publication:

Symposium Papers

Volume:

14

Abstract:

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.

DOI:

10.14359/6805

Document: 

SP14-11

Date: 

March 1, 1978

Author(s):

E. C. Tinsley and H. L Kalousek

Publication:

Symposium Papers

Volume:

14

Abstract:

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.

DOI:

10.14359/6811

123

Results Per Page