EARLY STRENGTH TEST FOR QUALITY CONTROL OF CONCRETE

The time-honored approach to ensure quality of concrete is to take samples at the job site, to mold test cylinders, and then to cure the cylinders under standard conditions for 28 days before testing. The procedure is convenient, the test is simple, and the equipment is dependable. The disadvantage of the 28-day curing is the delay time that neither leads to the early correction of a material problem nor facilitates the prompt removal of defective concrete. Several researchers have demonstrated the feasibility of 24-hour tests to ensure quality control of concrete. Most early tests have been accelerated strength tests employing hot air, steam, or water for curing. The higher temperature require special equipment, make the specimens difficult to handle, and introduce special problems when air-entraining agents and other additives are used. The merits of a simple 24-hour, 100 F (27.8C) hot-water curing and testing procedure are described. Results achieved with the procedures are presented and analyzed. It is concluded that a hot-water curing temperature of 100 F (37.8 C) is adequate. The temperature is low enough to be completely safe for personnel involved and to permit careful handling of test specimens. The equipment required is simple and inexpensive.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 61-68
  • Monograph Title: Recent developments in accelerated testing and maturity of concrete
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00131693
  • Record Type: Publication
  • ISBN: 0309024668
  • Files: TRIS, TRB
  • Created Date: Jun 5 1976 12:00AM