International Concrete Abstracts Portal

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International Concrete Abstracts Portal

Showing 1-10 of 11 Abstracts search results

Document: 

SP39-10

Date: 

January 1, 1973

Author(s):

T.Z. Harmathy

Publication:

Special Publication

Volume:

39

Abstract:

A review is presented of the work carried out in the author's laboratory over the past ten years concerning the fire endurance of concrete masonry walls. After defining fire endurance, the author surveys the material properties of concrete and the geometric features of the component units that affect the performance of concrete masonry walls in fire.

10.14359/17829


Document: 

SP39-09

Date: 

January 1, 1973

Author(s):

N.G. Zoldners, H.S. Wilson

Publication:

Special Publication

Volume:

39

Abstract:

Two series of lightweight concrete mixes made with expanded shale and slag aggregates were prepared for heat exposures between 300 C and 1000 C (572 F to 1832 F)/ To some concretes microfillers such as fly ash, silica flour, and calcined shale dust were added to replace 25 and 40% of the portland cement in the binder.

10.14359/17828


Document: 

SP39-08

Date: 

January 1, 1973

Author(s):

K.W. Nasser

Publication:

Special Publication

Volume:

39

Abstract:

The results of a research program that studied the effect of elevated temperature on the behavior of air-entraied concrete are presented.

10.14359/17827


Document: 

SP39-07

Date: 

January 1, 1973

Author(s):

R.A. Lapinas

Publication:

Special Publication

Volume:

39

Abstract:

High Early strengths can be achieved by mixing concrete at elevated temperatures.

10.14359/17826


Document: 

SP39-06

Date: 

January 1, 1973

Author(s):

Johan Alexanderson

Publication:

Special Publication

Volume:

39

Abstract:

An investigation is discussed which had as its aim the clarification of the causes of strength loss in heat cured concrete as compared with normally cured concrete. It is concluded that the dominant causes are of a physical nature, i.e., increased porosity and cracking, which can be the result of the pressure which occurs in the air pores upon heating. Criteria for the occurance of cracking have been formulated and with the aid of these the minimum tensile strength necessary to avoid cracking can be determined.

10.14359/17825


Document: 

SP39-05

Date: 

January 1, 1973

Author(s):

K.W. Nasser, G.A. Evans

Publication:

Special Publication

Volume:

39

Abstract:

A study was conducted on the influence of low temperature on the properties of hardened air-entrained concrete which was subjected to four different curing conditions. One of the curing conditions was related to the prevalent winter curing practice in Whitehorse, Yukon Territory, Canada. The tests consisted of compression, splitting tension, impact and elastic strains. In total, over four hundred specimens were tested.

10.14359/17824


Document: 

SP39-04

Date: 

January 1, 1973

Author(s):

J.N. Mustard

Publication:

Special Publication

Volume:

39

Abstract:

This paper discusses winter curing of concrete in the light of the New Canadian Standard. The effect of freezing fresh concrete at various ages is dealt with in some detail and tests results are given to illustrate the absolute minimum protection period and minimum protection methods.

10.14359/17823


Document: 

SP39-03

Date: 

January 1, 1973

Author(s):

V.M. Malhotra, Carl Berwanger

Publication:

Special Publication

Volume:

39

Abstract:

This paper reports the relationships of the strength of standard laboratory-cured cylinders to the strength of concrete in 24x24x66-inch (0.61 x 0.61 x 1.68-meter) columns and 24 x 24 x 8-inch (61 x 61 x 20-cm) slabs to that of cylinders cured under exposed winter conditions.

10.14359/17822


Document: 

SP39-02

Date: 

January 1, 1973

Author(s):

Brian B. Hope, Peter J. Quelch

Publication:

Special Publication

Volume:

39

Abstract:

The effect of freezing temperatures on the compressive strength and ultrasonic pulse velocity of vacuum processed and nonprocessed concrete was investigated for two concretes with initial water/cement ratios of .71 and .45.

10.14359/17821


Document: 

SP39-01

Date: 

January 1, 1973

Author(s):

Carl Berwanger and A. Faruque Sarkar

Publication:

Special Publication

Volume:

39

Abstract:

The thermal coefficient of expansion and the dynamic modulus of elasticity of concrete have been determined under short-term steady state temperatures, -100 to 150F (-73 to 66C). Specimens were cured both saturated and air-dried in the laboratory and tested at 7, 28, 84 days at at one year.

10.14359/17820


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