M. A. Rashid is an associate professor in the Department of Civil Engineering and Director of Planning and Development at Dhaka University of Engineering & Technology, Gazipur, Bangladesh.

M. A. Mansur is a visiting scholar in the Department of Civil and Environmental Engineering at the University of Michigan, Ann Arbor, Mich.

Flexural test results generated on 16 reinforced concrete beams to evaluate the implications of using high-strength concrete (HSC) are reported. Test parameters considered include concrete compressive strength, ratios of tensile and compressive reinforcements, and spacing of lateral ties. It is found that the current code provisions for serviceability requirements of maximum crack width and ultimate strength are adequate up to a concrete strength of approximately 130 MPa. Concerns, however, are expressed regarding the adequacy of those for cracking moment and service load deflection. It is shown that stresses generated by shrinkage of concrete and the creep associated with it can significantly affect the cracking moment and service load deflection of reinforced HSC beams. Also, some detailing requirements for compression reinforcement need to be reassessed so as to utilize its full strength potential and ensure adequate ductile response of the beam when HSC is  nvolved.