SUSTAINABLE DEVELOPMENT OF ULTRA HIGH PERFORMANCE CONCRETE MIXTURES USING HIGH VOLUME OF FLY ASH IN VIETNAM

Author(s): Pham Sy Dong, Le Trung Thanh, Nguyen Van Tuan and Nguyen Cong Thang
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference on UHPC Materials and Structures (UHPC2018-China)
Editor(s): Caijun Shi and Baochun Chen
ISBN: 978-2-35158-219-0
e-ISBN: 978-2-35158-220-6
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 185-194
Total Pages: 10
Language : English

Abstract: Ultra-High Performance Concrete (UHPC) is one of the new generation concretes, which
has been researched and developed for about 30 years. UHPC has superior properties such as
high flowability, high tensile/flexural/compressive strength, abrasion and impact resistance,
low permeability and high durability. UHPC is expected to have many potential applications
for construction structures. However, UHPC composition has a disadvantage that its
commonly contains a very large amount of cement, i.e. approximately 1 ton of cement per 1
m3 of UHPC, as cement is costly and the production of cement emits large volume of
greenhouse gases. The large volume of cement is considered to be a major impact on the
sustainable development of UHPC. Replacement of cement by fly ash in UHPC composition
is really necessary in Vietnam because the fly ash emissions from thermal power plants are
very large in recent years. This has the "double benefit" of enhancing the applicability of
UHPC as it reduces the amount of cement used and also reduces the amount of fly ash
dumped in landfills near the coal-burnt thermal power plants in Vietnam. This paper presents
the results of research on the development of UHPC mixtures using fly ash content with
different cement replacement levels up to 70% by mass. The experimental results show that
UHPC using a combination of 10% silica fume and 50% fly ash provides good workability,
fast strength development up to 135 MPa after 28 days under normal curing condition.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00