Title: A New Method and Apparatus for Accelerated Strength Testing of Concrete
Author(s): K. W. Nasser
Publication: Symposium Paper
Appears on pages(s): 249-258
Keywords: accelerated tests; compressive strength; fresh concretes;
heating; high temperature; pressure.
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.