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: 

SP14-03

Date: 

March 1, 1978

Author(s):

Helmut G. Kobler

Publication:

Symposium Papers

Volume:

14

Abstract:

Experience with dry-mix coarse-aggregate shotcrete, applied in layers up to about 6 in. thick, has proved it structurally adequate for both temporary and permanent underground support. Recommended ingredients, mix proportioning, and application techniques are explained, and mixing and placing devices are described in some detail. Recommendations for testing and quality control pro-cedures are outlined. How coarse-aggregate shotcrete meets requirements for various types of tunnel work is shown with details of its use on specific projects. Cost is compared with that of conventional tunnel support media.

DOI:

10.14359/6803


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

Date: 

March 1, 1978

Author(s):

Editor: Thomas J. Reading

Publication:

Symposium Papers

Volume:

14

Abstract:

SP14

This classic collection of 13 papers on shotcreting has been reprinted. Prepared as a guide for both field personnel who apply shotcrete as well as for engineers who specify its use, Shotcreting presents data on engineering properties of both dry-mix and wet-mix shotcrete made with coarse and lightweight aggregates as well as sand. Quality control methods and preparation of test specimens are discussed. Equipment capabilities are covered in detail. Shotcrete for repairs, use of shotcrete in tunnel linings and other underground support, shotcrete tanks, lightweight shotcrete, and the gunning of refractory castables receive attention.

Includes William R. Lorman's Engineering Properties of Shotcrete

Lorman's report supplements data on current practice in shotcreting with a review of the past 55 years of laboratory and field experience with pneumatically applied mortars and concretes. Emphasizes data on strength, elasticity and other physical properties of the hardened shotcrete. Compares properties of fine-aggregate shotcrete and coarse aggregate shotcrete and presents recommendations for mixing and testing methods.

DOI:

10.14359/14066


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


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


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