期刊
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
卷 23, 期 7, 页码 2432-2447出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10298436.2020.1858483
关键词
Roller-compacted concrete pavement; superplasticizers; Vebe time; mechanical properties; durability; thermal conductivity
This study investigates the effect of using different amounts of superplasticizer on the properties of RCC pavements. The results show that the use of 0.50% superplasticizer can improve the fresh and hardened properties, decrease porosity, increase compressive strength, and enhance thermal conductivity of RCC pavements.
This study investigates the effect of using different amounts of superplasticizer (SP) (0.25% and 0.50%) on fresh and hardened properties, durability, ultrasonic pulse velocity (UPV) and thermal conductivity of two RCC pavements with cement contents of 12% (269 kg/m(3)) and 15% (325 kg/m(3)). The test results demonstrate that the use of 0.50% SP in RCC pavement containing 12% and 15% cement decreased Vebe time about 22% and 27%, respectively. Also, an increase in cement content from 12% to 15% decreased the Vebe time about 18%. With the use of 0.50% SP, the 28-day compressive strength for RCC pavements containing 12% and 15% cement increased by 9% and 14%, respectively. In addition, the use of 0.50 SP reduced the porosity of RCC pavement, to about 8% for RCC pavement with 12% cement and 4% for RCC pavement with 15% cement. The results demonstrated that using 0.5% SP increased the thermal conductivity of RCC pavements containing 12% and 15% cement around 19% and 7%, respectively. Generally, the UPV and Field Emission Scanning Electron Microscope (FESEM) test results showed that the use of SP in RCC pavement may lead to a denser structure.
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