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Showing 1-5 of 18 Abstracts search results

Document: 

SP56-15

Date: 

October 1, 1978

Author(s):

K. W. Nasser

Publication:

Symposium Papers

Volume:

56

Abstract:

Description is presented of a new method and apparatus for accelerated strength testing of concrete. The method consists of subjecting the fresh concrete mixture to pressure and elevated temperature to accelerate curing. In a preferred embodiment, prediction of the 28-day strength is provided in about 5-hours. The apparatus comprises a cylindrical container with piston closures, a means to pressurize and seal the container and heating means to heat the sample within the container. Preliminary tests show that the relationship between the accelerated cured (X) and 28-day standard cured strength (Y) can be represented by the linear equation: Y = 1570 + 1.42X 500< X < 3400 psi Y = 105.9 + 1.42X 35< X < 239 kgf/cm 2 with an accuracy of + 15%. This relationship appears to be independent of the type of aggregates and admixtures used.

DOI:

10.14359/6506


Document: 

SP56-07

Date: 

October 1, 1978

Author(s):

V. Ramakrishnan and J. Dietz

Publication:

Symposium Papers

Volume:

56

Abstract:

The accelerated curing methods recommended by the American Society for Testing and Materials were adopted for estimating the potential strength of con-crete used in the western South Dakota. Cylinders were made and tested from 21 different batches of concrete used in the construction of buildings, bridges, and pavements. These concretes were supplied by two local ready-mix concrete producers, one using the central-mixer technique and the other using the transit mixer operation. Ranges of variables included in this investigation were, types of cements (Type I, Type II, and Type K), types of molds (steel, plastic and cardboard), water-cement ratios (by weight) 0.41 to 0.72, aggregate-cement ratios (by weight) 2.5 to 4.1, maximum size of coarse aggregate 1 inch, and the 28-Day Compressive Strengths 3400 to 6800 psi (23500 to 46900 kPa). An equation and correlation curves are presented for the locally used materials and mixes relating the strength of Type I, Type II and Type K cement concretes obtained in the accelerated curing methods and the 28-day strength obtained with standard curing conditions. Analyzing the results from this investigation and the results from other investigators from various parts of the world, an equation applicable universally with reasonable ac-curacy is presented for estimating the potential strength of concrete using the boiling water method.

DOI:

10.14359/6498


Document: 

SP56-06

Date: 

October 1, 1978

Author(s):

R.A. Lapinas

Publication:

Symposium Papers

Volume:

56

Abstract:

Accelerated testing of concrete by means of boil-ing test cylinders and testing them at the age of 28 1/2 hours to predict the 28 day strength was used by ready-mixed con-crete producer's quality control laboratory for about two years. Over 300 accelerated tests were carried out indi-cating that 28 day strength can be predicted using this method within the accuracy of +12%. Continuous updating of the accelerated to 28 day strength relationship is neces-sary. The suitability of the method for day-to-day quality control purposes is evaluated.

DOI:

10.14359/6497


Document: 

SP56-09

Date: 

October 1, 1978

Author(s):

Lloyd E. Rodway and Karl A. Lenz1

Publication:

Symposium Papers

Volume:

56

Abstract:

Data are presented covering the period 1974 to 1976 inclusive as collected by Manitoba Hydro and by R.M. Hardy and Associates Ltd. The former is a public utility and the latter a consulting engineering group. The Mani-toba Hydro results are from a project in Northern Manitoba utilizing CSA Type 10 (ASTM Type 1) portland cements manufactured in both Manitoba and Ontario. Results from the Hardy group were collected on a number of projects in Southern Alberta - principally sidewalk concrete control work in the City of Calgary and a gas plant near Pincher Creek, Alberta. Results from CSA Types 10 and 50 (ASTM Type I and V) portland cements are presented separately. Regression equations are developed and compared with equations prepared from earlier Western Canadian data.

DOI:

10.14359/6500


Document: 

SP56-17

Date: 

October 1, 1978

Author(s):

V. Ramakrishnan

Publication:

Symposium Papers

Volume:

56

Abstract:

This annotated bibliography is aimed at provid- . ing the concrete technologist and the construction engineer information about the recently developed, but not yet adequately used, accelerated methods of testing concrete. This will also be of value to any researcher in the same or similar area of concrete technology research. It covers the development of accelerated curing techniques, and the influence of temperature on strength development. Some references on maturity of concrete which are integrally connected with accelerated testing are included. However, this bibliography is not intended to be exhaustive; it is a selective bibliography chronologically arranged. Annotations are provided for selected entries, and have been omitted when there are repetitions in listed references, unavailable references, and foreign language references. When titles alone are sufficiently indicative of the content, annotations are omitted.

DOI:

10.14359/6508


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