Preventing Joint Deterioration
Concrete provides a durable, attractive paved surface for roads. It provides
a longer life than any other leading paving material and does not rut
or shove due to traffic or warm temperatures. Concrete’s higher
reflectance keeps surfaces cooler, helping to minimize the urban heat
island effect, and can lower infrastructure and ongoing lighting costs,
while boosting safety for vehicles and pedestrians.
Some concrete pavements in northern states have exhibited joint deterioration:
the premature disintegration of concrete around the joint. This deterioration
typically begins to show after several years in place. The mechanism behind
joint deterioration is complex and is understood to have a basis in freeze-thaw
damage and mechanical damage.
Based on the current understanding of the mechanisms behind joint deterioration,
there are four recommendations for new construction:
|• Quality concrete mixtures
|• Properly entrained air void systems
|• High quality curing
|• Appropriate drainage
Recommendations for mitigation with existing pavements
include applying sealants to the concrete near the joints, limiting the
types of deicers used to sodium chloride, repairs to the joint, unclogging
drainage systems, and retro-fitting improved drainage systems. More
on preventing joint deterioration.
CP Road Map “Moving Advancements into Practice”
The National Concrete Pavement Technology Center
at Iowa State University developed the CP Road Map as the national strategic
plan for concrete pavement research. They identified 12 tracks for research
and disseminate innovative research for each of these tracks through their
“Moving Advancements into Practice” briefs. One of the most
recent MAP Briefs is Preventing Joint Deterioration in Concrete Pavements:
A Summary of Current Knowledge. This four-page brief discusses the
causes, prevention, and mitigation of premature joint deterioration.
Other recent MAP Briefs include Fly Ash as a
Supplementary Cementitious Material in Concrete Mixtures and Partial-Depth
Repairs for Concrete Pavements.
Read these and other MAP Briefs.
the latest issue of their e-newletter.
New Edition of Innovations in Portland Cement
The fully revised second edition of Innovations
in Portland Cement Manufacturing by PCA addresses challenges facing
cement manufacturers in today’s regulatory and manufacturing arenas.
The publication includes several new chapters
on finish grinding, oxygen enrichment, inlet gas analysis and acoustic
pyrometry. Sustainability and the environment are addressed throughout
the book. Health and safety issues also take center stage.
More information and purchase.
Design and Control of Concrete Mixtures, 2011 Edition
The guide to applications, methods, and
The industry’s primary reference on concrete
technology, this fully revised 15th edition is a concise, current reference
on concrete that reflects the latest information on standards, specifications,
test methods and guides of ASTM International (ASTM), the American Association
of State Highway and Transportation Officials (AASHTO), the American Concrete
Institute (ACI), and the National Ready Mixed Concrete Association (NRMCA).
Design and Control of Concrete Mixtures presents the properties
of concrete as needed in concrete construction, including strength and
durability. This book is a “must have” for anyone involved
with concrete. More
information and purchase.
MIT Concrete Sustainability Hub Research Briefs
Five new briefs from the Massachusetts Institute
of Technology’s Concrete Sustainability Hub (CSH) have recently
been released. These short articles summarize exciting results of on-going
research activities in the areas of Concrete Science and Life-Cycle Assessment.
What’s In Your Concrete (Part II)
The combined use of nanoindentation and statistical analysis to reveal
micromechanical properties of cement hydrate phases is profiled. Two types
of C-S-H, low-density (LD) or high-density (HD), can be distinguished
which may be related to macroscopic strength and durability performance.
Clinker Grinding at Breaking Point
About 10-12 percent of the energy required to produce portland cement
is due to grinding of raw material and clinker as well as other electrical
processes. By means of atomistic simulations, the theoretical energy required
to break clinker surfaces can be determined and linked to the corresponding
grinding energy (power consumption) required to achieve a target fineness
(specific surface). The simulation is being validated by microscratching
of industrial clinker phases. The atomistic approach provides a baseline
for the optimization of cement grindability.
Setting from Statistical Principles
This brief describes a new approach to quantitatively model the formation
of cement hydration products, including their mechanical properties, based
on statistical mechanics. The input comes directly from the atomistic
simulations of composition of solution and precipitates. This provides
a tool for the investigation of microstructure and property evolution
Adopting a Life-Cycle Perspective
This brief reviews the methods of determining the environmental impacts
from a life-cycle viewpoint. It is recommended that economic and environmental
impacts of infrastructure be evaluated using a life-cycle perspective,
enabling engineers, designers, and decision makers to better understand
the impacts of infrastructure and the opportunities that exist to improve
them. Two methodologies — life-cycle assessment (LCA) for environmental
impact and life-cycle cost analysis (LCCA) for economic impacts —
provide anayltical tools to help reach sustainability targets using cost-effective
When the Rubber Hits the Road
Fuel consumption due to pavement-vehicle iInteraction (PVI) is an essential
part of life-cycle assessment (LCA) of pavement systems. Available field
data for different pavements shows a high level of uncertainty and many
models for effects of pavement characteristics on fuel consumption have
been developed using outdated information, making it difficult to reliably
implement PVI into LCA analyses. This brief reviews a mechanistic approach
to derive relationships between fuel consumption, and structural and material
pavement design parameters, providing engineers and decision makers with
a design tool to optimize pavements for high performance fuel and green
house gas efficiency.
the most recent news briefs from the CSH.
More information on the MIT
Concrete Sustainability Hub Concrete Science program.
2011 Professors' Workshop Includes Track on Concrete
Professors’ Workshop, is being offered August 1-5, 2011 at the
PCA headquarters in Skokie, Ill. This year introduces a new format which
includes four tracks: Concrete
materials properties; Engineering and economics of concrete buildings;
Design and construction of concrete bridges by the AASHTO LRFD; and Design,
construction, and performance of concrete pavements.
The Professors’ Workshop is designed to provide faculty in engineering,
architecture, and construction management programs the tools to teach
the latest developments in concrete materials, construction, and design.
The week-long session includes networking
opportunities to exchange ideas with professors from many universities,
demonstrations by software vendors, and resource materials and publications
valued at more than $1,000.
State-of-the-Art Report on Use of Limestone in Cements
at Levels of up to 15%
This report is a compilation
of technical information for engineers, specifiers, and other concrete
technologists on use of limestone in hydraulic cements in amounts up to
15% (focusing on amounts between 5% and 15%). Environmental benefits are
noted as well as experience with the use of cements with limestone at
these levels. The chemical and physical effects of limestone on fresh
and hardened properties of concrete are emphasized and several case studies
of pavements constructed with concrete made with such cements in Canada
and the US are reviewed. Download
The Durability of Concrete Produced with Portland-Limestone
In anticipation of the adoption of portland-limestone
cements by concrete specifications and building codes, several Canadian
cement producers initiated plant trial grinds to produce portland-limestone
cements containing up to 15% limestone and research was conducted on properties
as well as performance and durability in concrete. These cements were
tested in mortar and concrete containing a wide range of SCMs and performance
was compared with equivalent mortars and concretes produced with portland
cement from the same plant. This report presents and summarizes the findings
of these research programs. Download
A workshop on Expansive
Reactions in Cement-Based Materials will be held on July 27-29, 2011
at the Oregon State University in Corvallis, Ore.
Advances in Cement-based Materials: Characterization, Processing, Modeling
and Sensing conference will be held at Vanderbilt University in Nashville,
Tenn. on July 24-26, 2011. Presentation topics include cement chemistry
and nano/microstructure, advances in material characterization, and concrete
International Concrete Sustainability Conference will be held at the
Hyatt Regency Cambridge and the Massachusetts Institute of Technology
campus in Cambridge, Mass. on August 9-11, 2011. The conference will provide
learning and networking opportunities for sustainable concrete manufacturing
and construction with topics that include low impact development, carbon
footprint, and performance-based concrete.
2011 Concrete Industry Day will be held on August 11, 2011 at the
Kresge Auditorium in Cambridge, Massachusetts. It is sponsored by the
Massachusetts Institute of Technology’s (MIT) Sustainability Hub.
listing of industry conferences.
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