Field investigation of high-volume fly ash pavement concrete
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7/18/2019 Field investigation of high-volume fly ash pavement concrete
Field investigation of high-volume fly ash pavement concrete
Roz-Ud-Din Nassar a,∗, Parviz Soroushian b, Tewodros Ghebrab c
a Civil Engineering, University of South Asia, Lahore, Pakistanb Civil and Environmental Engineering,Michigan StateUniversity, United Statesc Construction Engineering, Texas Tech University,United States
a r t i c l e i n f o
Article history:
Received 28 July 2012
Received in revised form16 December 2012
Accepted 5 January 2013
Keywords:
High-volume fly ash concrete
Durability
Pozzolan
Pavement
a b s t r a c t
Field investigation of high-volume fly ash (HVFA) concrete in pavement construction wascarried out. Test
results performed oncores drilled from pavement after 270days of concrete age showed that use of HVFA
results in production of pavement concrete with improvements in: strength; moisture barrier qualities;
and abrasive resistance characteristics. These improvements are brought about bythe pozzolanic reaction
offly ash with the hydrates of cement that favorably changes the microstructure and interfacial transition
zone in the resulting concrete.
Use of high volume of fly ash in pavement concrete as partial replacement for cement is estimated
to produce major energy and environmental gains and is a practice that is aimed at producing durable
and sustainable concrete-based infrastructure. The use of HVFA concrete can significantly economize the
construction of concrete pavements and improve the service life of transportation infrastructure.
of HVFA and control concrete materials were statistically compa-
rable, pointing at the suitability of HVFA concrete for pavement
construction.
4. Conclusions
• Production of concrete incorporating high-volume of fly ash as
partial replacement for cement in concrete is an important step
aimed to reduce the energy and environmental implications of
cement and concrete industry.• Use of HVFA concrete in pavement construction is a viable
practice that can help in development of economical transporta-
tion infrastructure with increased service life benefited from the
enhanced concrete durability.• Significant increase in the later age strength of HVFA concrete
materials is achieved through the formation of denser and lesspermeable microstructure as a result of the pozzolanic reaction
offly ashand thefilling effectof sub-micron sizedfly ashparticles.• No signs of surface damage in the form of scaling were noticed in
the HVFA concrete pavement sections during the field observa-
tions done after their exposure to a complete cycle of aggressive
weather under heavy traffic load.• The use of high-volume fly ash as partial replacement of cement
in HVFA concrete results in enhanced durability characteristic
such as sorption, chloride permeability, and abrasion resistance
through improvement in poresystem characteristics,filling effect
of fly ash particles, and conversion of CH to C-S-H through poz-
zolanic reaction of fly ash with hydrates of cement.
Acknowledgements
Part of this research project was funded jointly by FHWA
and Washtenaw County Road Commission, MI. Authors are grate-
ful to their financial support. Vital support of Roy Townsend
and Sheryl Soderholm Siddall of Washtenaw Road Commission
and Hugh Luedtke of Ajax Paving is gratefully acknowledged as
well.
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