Proportioning RCCP mixes under hot
weather conditions for a specified tensile strength
Hisham Y. Qasrawi, Ibrahim M. Asi and H. I. Al-Abdul
Wahhab
a Civil Engineering Department, Faculty of
Engineering, Hashemite University, Zarqa 13115,
Jordan
b Department of Civil Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi
Arabia
Abstract
The
work presented in this paper introduces the use of roller-compacted concrete
pavements (RCCPs) as a substitute to the traditional
asphalt concrete pavements that suffer from severe rutting and cracking due to
heavy loading and hot weather which prevail in most of the
Results
showed that under hot weather conditions, slight alterations in material
proportions should be made to arrive at the required properties of RCCP mixes.
A W/C ratio of 0.45 has been found to produce the optimum density and tensile
strength for concrete in hot weather under the conditions of the experiments.
One of the major findings was that the main factor that controlled most of the
fresh and hardened properties is the cement content. Another important factor
is that, unlike normal concrete, lowering the W/C ratio below an optimum value
may not result in increase in the strength. Based on the results, simple
relationships and equations have been obtained to predict the tensile strength
of RCCP using the proportions of the mix. In addition, it has been found that a
simple relationship, similar to the one presented in the ACI 325.10
state-of-the-art report, exists between the
compressive and the tensile strength of concrete. The equation is presented in
the simple form:
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Based on the extensive study, the
paper proposed a method of mix design that is suitable for RCCP in the
Author Keywords: Concrete; Mix design;
Roller-compacted concrete