This article discusses the accelerated test method and the cumulative sum (cusum) analysis which controls the validity of the accelerated/28 day strength correlation: Performance predictions can be made on the basis of applying the described procedures one day or seven days after sampling. The equipment and procedure used in the accelerated test method are discribed. Pre and post curing effects of accelerated testing methods are described as well as necessary procedures to reduce the risk of potential scatter. It is noted that the correlation between accelerated and 28-day test results for a particualr plant was specific to the current composition and fineness of the cement and the nature of other concrete constituents which influence hydration. A mathematical equation is given for the forecasting 28 day strenght. If forecasts of 28-day forecasting the 28 day strength. If forecasts of 28-day important that changes in correlation be detected as quickly as possible and the forecasting method be revised. The principle fractures of cusum control analysis for correlation purposes are described. The principal cause of correlation changes is that of deliberate or accidental change in the strength gain rate of the cement. Early use of the accelerated test was used primarily to provide improved quality control. Today, with the development of standard correlation tables and cusum control, the test is used to provide rapid measures of strength and to provide means for forecastng 28-day strength.

  • Availability:
  • Corporate Authors:

    Morgan-Grampian (Professional Press) Limited

    Morgan-Grampian House, Calderwood Street
    London SE18 6QH,   England 
  • Publication Date: 1977-7

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00165916
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 12 1978 12:00AM