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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 17 Abstracts search results

Document: 

SP64-03

Date: 

July 1, 1980

Author(s):

Charles A. Gaskill and Richard C. Jacobs

Publication:

Symposium Papers

Volume:

64

Abstract:

Expansive concrete has been used in a variety of warehouse applications but not under multiple temperature conditions. In addition, job data to support degrees of shrinkage compensation has been limited. This project was used to compare slab design theory with on-site analysis of concrete expansion and shrinkage. Measurement pins were placed at 50 ft (15.24 m) and 100 ft (30.48 m) intervals and arranged to measure center and edge slab movement under a variety of restraint and temperature conditions.

DOI:

10.14359/6670

Document: 

SP64-04

Date: 

July 1, 1980

Author(s):

Jack E. Rosenlund

Publication:

Symposium Papers

Volume:

64

Abstract:

A description of the role of the architect, engineer, laboratory, and contractor in the design and construction of this all cast-in-place concrete structure is given. Di scusses shrinkage control to reduce cracking, and the dual role played by shrinkage-compensating concrete and post-tensioning in achieving this. Explains field, as well as laboratory, testing of concrete to determine effect and amount of expansion experienced.

DOI:

10.14359/6671

Document: 

SP64-05

Date: 

July 1, 1980

Author(s):

Shigeyoshi Nagataki

Publication:

Symposium Papers

Volume:

64

Abstract:

In Japan, expansive cement concretes are made by the addition of expansive components at the time of mixing in the field. According to the quantity involved these expansive components can be used in shrinkage-compensating concretes, or self-stressing concretes. This paper describes the present state of expansive cement concretes in Japan, some information on principal research reports, standard test methods, recommended practices, and examples of the use of expansive cement concretes for various types of structure.

DOI:

10.14359/6672

Document: 

SP64-06

Date: 

July 1, 1980

Author(s):

H. G. Russell

Publication:

Symposium Papers

Volume:

64

Abstract:

This paper reports an experimental investigation to evaluate the performance of reinforced concrete slabs made with shrinkage compensating concrete. The effects of type of cement, type ofaggregate, percentage and position of reinforcement, slab thickness and curing conditions on expansion and subsequent shrinkage were evaluated. Measurements were made on 41 slabs. Flexural tests were conducted to determine the effects of the variables on cracking and strength. Generally, the level of expansion affected the cracking loads but had no effect on flexural strength. Final net shrinkage for slabs with shrinkage-compensating concrete was less than that for comparable slabs made with Type I cement. Creep tests were also conducted to measure the properties of shrinkage compensating concretes under constant axial load. The results were compared with data from similar specimens containing Type I cement. Initial deformations were predicted accurately usin the theory of elasticity. Measured creep of the slabs containing shrinkage-compensating concretes was higher than the creep of corresponding Type I slabs.

DOI:

10.14359/6673

Document: 

SP64-07

Date: 

July 1, 1980

Author(s):

G. B. Moore

Publication:

Symposium Papers

Volume:

64

Abstract:

Companion specimens of concrete made with Type I and Type K shrinkage-compensating cement were placed in andwhere they were exposed to the atmosphere approximately 50 percent of the time, and covered by seawater the rest of the time. Pulse velocity measurements made at intervals up to 9 years show no indication of deterioration. Specimens continuously exposed to the atmos- phere in the same location have somewhat lower pulse velocities, but show no deterioration..

DOI:

10.14359/6674

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