Abstract
Recyclable concrete pavement was made from fly ash and crushed limestone sand and gravel as aggregates so that the concrete pavement could be recycled to raw materials for cement production. With the aim to use as much fly ash as possible for the sustainable development of society, while achieving adequate strength development, pavement concrete having a cement-replacement ratio of 40% by mass was experimentally investigated, focusing on the strength development at an early age. Limestone powder was added to improve the early strength; flexural strength at two days reached 3.5 MPa, the minimum strength for traffic service in Japan. The matured fly ash concrete made with a cement content of 200 kg/m3 achieved a flexural strength almost equal to that of the control concrete without fly ash. Additionally, Portland cement made from the tested fly ash concrete was tested to confirm recyclability, with the cement quality meeting the Japanese classification of ordinary Portland cement. Limestone-based recyclable fly ash concrete pavement is, thus, a preferred material in terms of sustainability.
Highlights
Asphalt concrete pavement accounts for approximately 95% of the total length of road in Japan.Cement concrete pavement accounts for less than 5% of the total length because of the concerns of construction costs and traffic noise, yet it has adequate durability and superior life-cycle cost
The present study focuses on developing a recyclable fly ash concrete pavement having adequate early strength and confirming the recyclability for cement production
The early-age strength is the most concern relating to the practical use of fly ash concrete, and the study aimed to develop a concrete pavement having adequate early strength
Summary
Asphalt concrete pavement accounts for approximately 95% of the total length of road in Japan. Naik et al [8] conducted a field study to investigate the long-term performance of concrete pavements made with a high volume of class-C and -F fly ash. Atis [10] examined the strength properties of roller-compacted and workable HVFA concretes having cement replacement ratios of 50% and 70%. According to their investigation, the HVFA concrete had higher compressive and tensile strengths than normal concrete made without fly ash. The present study aims to develop a fly ash concrete pavement having adequate strength at an early age. The present study focuses on developing a recyclable fly ash concrete pavement having adequate early strength and confirming the recyclability for cement production. This paper presents fundamental properties of the recycled cement made from the fly ash concrete pavement
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