Details:

Creators:
Volz, Jeffery S. ; Myers, John J. ; Richardson, David N. ; Arezoumandi, Mahdi ; Beckemeier, Karl ; ... More +
Volz, Jeffery S. ; Myers, John J. ; Richardson, David N. ; Arezoumandi, Mahdi ; Beckemeier, Karl ; Davis, Drew ; Holman, Kyle ; Looney, Trevor ; Tucker, Brian Less -
Corporate Creators:
Missouri University of Science and Technology
Subject/TRT Terms:
[+]
Fly Ash
Pavements, Reinforced Concrete--Design And Construction
Portland Cement--Additives--Testing
Admixtures
Durability
Mix Design
Portland Cement Concrete
Reinforced Concrete
Setting (Concrete)
Waste Products

Publication/ Report Number:
TRyy1110 ; cmr 13-008
TRyy1110 ; cmr 13-008 Less -
Resource Type:
Tech Report
Geographical Coverage:
Missouri
Edition:
Final report.
Corporate Publisher:
Missouri. Dept. of Transportation
NTL Classification:
NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ;
Abstract:
Concrete is the world’s most consumed man-made material. Unfortunately, the production of portland cement, the active

ingredient in concrete, generates a significant amount of carbon dioxide. For each pound of cement produced, approximately one

pound of carbon dioxide is released into the atmosphere. With cement production reaching nearly 6 billion tons per year

worldwide, the sustainability of concrete is a very real concern.

Since the 1930’s, fly ash – a pozzolanic material – has been used as a partial replacement of portland cement in concrete to

improve the material’s strength and durability, while also limiting the amount of early heat generation. From an environmental

perspective, replacing cement with fly ash reduces concrete’s overall carbon footprint and diverts an industrial by-product from

the solid waste stream (currently, about 40 percent of fly ash is reclaimed for beneficial reuse and 60 percent is disposed of in

landfills).

Traditional specifications limit the amount of fly ash to 25 or 30 percent cement replacement. Recent studies, including those

by the investigators, have shown that higher cement replacement percentages – even up to 75 percent – can result in excellent

concrete in terms of both strength and durability. Referred to as high-volume fly ash (HVFA) concrete, this material offers a

viable alternative to traditional portland cement concrete and is significantly more sustainable. By nearly doubling the use of

reclaimed fly ash in concrete, HVFA concrete aligns well with MoDOT’s green initiative on recycling.

However, HVFA concrete is not without its problems. At all replacement rates, fly ash generally slows down the setting time

and hardening rates of concrete at early ages, especially under cold weather conditions, and when less reactive fly ashes are used.

Furthermore, with industrial by-products, some variability in physical and chemical characteristics will normally occur, not only

between power plants but also within the same plant. Consequently, to achieve the benefits of HVFA concrete, guidelines are

needed for its proper application in bridges, roadways, culverts, retaining walls, and other transportation-related infrastructure

components.

The objective of this research was to design, test, and evaluate HVFA concrete mixtures. The study focused on the hardened

properties of HVFA concrete containing aggregates and fly ash indigenous to the state of Missouri and developed guidelines on

its use in infrastructure elements for MoDOT.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:c0632afa2926c75001fc954360ec4d445ba861b7b5040a3904d7747eae685ce9
File Type:

Supporting Files

• No Additional Files

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