Abstract
The Cemented Crushed Stone (C2, as the South African Classification) was widely used on the main high-traffic Brazilian highways in the 1970s and 1980s. However, it presents several limitations for its use in the road work related to the properties of the material and its almost fragile nature, since as soon as the large variations in the tensile strain take place along the loading cycle, critical and accelerated degradation also occur, leading to material fatigue distress. Several factors stand out as probable causes for the intense and rapid process of fatigue, the main ones being: granulometry, cement content, and moisture content. In this way, a study was carried out to analyze the mechanical properties of C2 based on granulometry variation in relation to the cement and moisture content. It was noted that the mixture with the best joint performance was the one with the highest percentage of the sand fraction, highest cement content, and molded below the optimum moisture. Some recommendations were made for the mix design of C2, such as the definition of a granulometric range that considers the analysis of the aggregate large/small ratio in order to obtain a greater gain of maximum dry specific mass, as well as the use of cement contents above 4%, since below that the cementation will be insufficient. In addition, optimized ratios (aggregate + cement + water) should be defined by performing the mechanical analyzes listed in this paper, in order to select the best performance mixture to be applied in the road works.
Highlights
A more durable pavement has been a major challenge for Road Engineering
The objective of this study was to analyze the mechanical properties of Cemented Crushed Stone from the variation of granulometric ranges, cement content, and moisture content
Two granulometric ranges were used, the irst based on Brazilian standards, called A, and the other, called B, established according to the speci ication of the Republic of South Africa (SAPEM, 2014)
Summary
A more durable pavement has been a major challenge for Road Engineering. The signi icant increase in traf ic volume, excessive loads, and inferior quality of materials have caused a reduction in pavement durability due to accelerated fatigue damage. Knowledge of the characteristics of the materials that make up the base and sub-base layers becomes necessary for determining the allowable stresses and strains, in order to avoid early damage to the pavement structure. Cement treated materials are an alternative for making up pavement layers due to their ability to reduce plastic deformation and avoid fatigue demage while reducing tensile stresses (MEDINA & MOTTA, 2015). Volume 28 | Número 1 | 2020 to bind the aggregates This requires the addition of water in order to reach the maximum dry apparent density in the compaction process and for cement hydration (DER/PR, 2005; YEO et al, 2011; XUAN et al, 2012)
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