The work for this study consisted of the following: (1) Six 4- by 4- by 14-inch beam molds will be fabricated at Turner-Fairbank Highway Research Center's (TFHRC's) machine shop.(2) Three different mixes with three different water-to-cement (W/C) ratios will be used. The aggregate includes gravel, limestone, and diabase. (3) Concrete mixes will be cast with two different beam sizes and tested at 28 days.(4) The results will be compared and a correlation will be established.(5) A report documenting the results will be published.
The primary objective of this study is to examine the feasibility of using a smaller-size beam (4 by 4 by 14 inches) to conduct flexural strength testing (ASTM C-78) for concrete pavements in the field and in the laboratory. This objective will be achieved by comparing flexural strength test results obtained from the regular- and smaller-size beams. If good correlation is achieved, States may start using the smaller-size beams for quality assurance with more confidence.
The results of the data analysis revealed a very good correlation between the flexural strength of smaller size beams and the traditional beam sizes.