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What’s New at ISCP Research News Industry Notes Featured Thesis
Abstract Upcoming Events
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Australian
Society for Concrete Pavements (ASCP) Holds Forum, Elects Officers
The elected
officials for ASCP are: Mark Hoskins (Leighton Contractors) as President and
Tracy Edwards (Connell Wagner) as Vice-President. ASCP is strongly backed by major sponsors,
including the Roads & Traffic Authority (NSW), Abigroup Constructions,
Leighton Contractors, Thiess, Maunsell, Macmahon Constructions, Connell
Wagner, and Clark Equipment Sales. The ASCP website
development will be completed by the end of May, providing a resource centre
for information on concrete pavements as well as many important member and
industry services. A temporary website
for ASCP is: http://www.concretepavements.com.au/ The next ASCP
Forum will be held on Abstracts Deadline for 2nd Advanced
Workshop Extended
The deadline for
abstract submissions for the ISCP-Sponsored 2nd Workshop on “Advanced
Characterization, Modeling, and Design of Concrete Pavements” has been
extended to The workshop
organizers, ISCP members Jeff Roesler and Lev
Khazanovich,
urge interested participants to contact them to express interest and to
submit a short abstract before the extended due date. This workshop will be
held on http://www.concretepavements.org/2ndworkshop/ Deadline for
Student Poster Board Submittal Approaches Graduate and
undergraduate college students are encouraged to submit their work for the
Student Poster Board Competition at the 9th International Conference on
Concrete Pavements, The best student
poster board presentation at the conference session will be awarded the B.F. McCullough Award. In addition, student poster board authors
are eligible to earn registration fee waivers for the International
Conference (limit one fee waiver per poster). Grants for student conference
travel may be available from participating chapters of the American Concrete
Pavement Association (www.pavement.com). For additional
information, submittal details, and example posters please go to: http://www.concretepavements.org/9thiccp/student.html 9th
International Conference Paper Revisions Due The deadline for
accepted manuscript revisions for the 9th
International Conference on Concrete Pavements has been set at Friday, April 18, 2008. This deadline is required to facilitate any
necessary re-reviews, final formatting, and preparation for publication
before the 9th Conference.
The manuscripts must be formatted in accordance to the publication
guidelines found at: http://www.concretepavements.org/9thiccp/author.html Revised manuscripts can be submitted
through e-mail to conference coordinator Nona Schaler at iscp9th@verizon.net.
ACPA Excellence
in Concrete Pavement Award Nominations Open The
American Concrete Paving Association’s (ACPA) 19th Annual Awards for
Excellence in Concrete Pavement are open for nominations. The awards are designed to honor quality
concrete pavements constructed in the United States and Canada each year. The
awards program encourages high-quality workmanship in every concrete pavement
project and serves as a forum for sharing information about highly successful
projects. The
awards program recognizes contractors, engineers, and project owners who
completed outstanding projects in 2007. Winning an Award for Excellence in
Concrete Pavement provides the contractors, engineers, and owners with a
level of prestige that can assist them in the development of future projects. For
more information or to nominate projects using the online form (deadline of July 18, 2008), please go to: http://www.pavement.com/Events_and_Programs/Awards/Paving_Awards/index.asp New Chemical Admixture for Slip-form Paving BASF Construction
Chemical Company has developed a new liquid chemical admixture called Navitas
33, a rheology-controlling admixture (RCA).
The RCA is designed for use in low-slump concrete mixtures, especially
for slip-form paving operations to aid in finishing and providing more
uniform edges. The admixture acts as a
lubricant and lowers the yield stress to increase workability and flow during
vibration only, when energy is added to the concrete. Unlike viscosity modifying admixtures
(VMA), this chemical admixture does not impact the viscosity or slump of the
mixture. For more
information about Navitas 33, go to: http://www.basf-admixtures.com/BasfAdmixturesInc/EN/Markets/Paving/msds/ New NCHRP Report
Released on Recycled Aggregates
The transportation
infrastructure uses about 95 percent of all aggregates manufactured in the
United States. With the vast majority
of these aggregates being new, virgin aggregates, more transportation
agencies are looking into utilizing recycled materials for reduced costs and
to lessen environmental impacts of pavement construction. The National Cooperative Highway Research
program (NCHRP) has just released a new document entitled
“Performance-Related Tests of Recycled Aggregates for Use in Unbound Pavement
Layers” by Dr. Athar Saeed of Applied Research Associate, Inc. for use by the
pavement community. This report can be
downloaded as a .pdf document at: http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rpt_598.pdf The appendices for
this report can also be downloaded at: http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_w119.pdf First Meeting Held
for the U.S. National Concrete Consortium (NCC) The first meeting of the U.S. National Concrete Consortium (NCC) was held on April 9-10th, 2008 and was hosted by the Louisiana Transportation Research Center in Baton Rouge, LA. Eighteen state DOTs from across the US (from California to New York and Georgia to Minnesota) were represented, as well as FHWA, several APCA Chapters, academia partners, and industry and suppliers involved in concrete pavement construction. The meeting theme was “Sustainability in
Concrete Construction” and an agenda can be found at: http://www.cptechcenter.org/t2/ttcc_ncc_meeting.pdf The purpose of the NCC is best expressed
in its vision and mission statements: § Vision – “Academia, government agencies, and
industry working together to continuously improve concrete performance and
durability in a cost-effective manner.” § Mission – “Provide an ongoing National forum for
Portland cement concrete (PCC) and pavement technology sharing to encourage
uniform specifications, mutual problem solving, coordinated research, and
implementation of new technologies.
Promote quality design and construction practices.” US State DOTs can join the through the
Technology Transfer Concrete Consortium (TTCC) Pooled Fund Project: http://www.pooledfund.org/documents/TPF-5_159/TTCC_Problem_Statemet.pdf
EVALUATION
OF LABORATORY AND FIELD TECHNIQUES TO IMPROVE PORTLAND CEMENT CONCRETE
PERFORMANCE Dr.
Tyson D. Rupnow Ph.D.
in Civil Engineering (2007) Department
of Civil, Construction, and Environmental Engineering Iowa
State University, Advisors:
Professors Vernon R. Schaefer and Kejin Wang This dissertation
is presented as a compilation of five papers, four submitted, or to be
submitted, to scholarly journals, and one submitted to a peer-reviewed
conference. Each paper is presented as
a chapter in the dissertation and includes a short literature review,
research data, significant findings, and references. A general conclusion section follows the
main body of the dissertation and summarizes the significant research
findings from each paper and includes recommendations for further research. The first paper presents a paste
and concrete laboratory study investigating the two-stage mixing process and
its effects on portland cement concrete mix consistency and concrete
performance. In the paste study,
mixing energy was varied to determine the effects on rheological and
compressive strength properties. The
concrete study investigated the two-stage mixing process and its effects on
fresh and hardened concrete properties.
The second paper details a new
characterization procedure for portland cement using the heat signature. The first fifteen minutes of the heat
generation curve are of particular interest.
A Type I/II portland cement was used to determine the effects of
initial water and initial cement temperature on the heat signature of the
paste. Several other portland cements,
including blended cements, were also investigated to show the differences in
cement chemistry when comparing the heat generation curves. The third paper investigates the
effects of differing air entraining agent (AEA), water reducing agents, and supplementary
cementitious materials (SCM) on the air void structure of fresh mortar
samples. This study was conducted as
part of a larger study investigating ternary mix designs. The air void analyzer (AVA) was used to
document the air void structure and identify anomalies or incompatible
material combinations. Cubes were cast
for compressive strength testing at seven days to show incompatible
combinations in terms of retarded strength gain. The fourth paper uses AVA data
from a sixteen-state pooled fund study to evaluate the AVA usage and sampling
locations. Samples were obtained from
the slip-formed concrete surface behind the paver on vibrators and between
vibrators from sixteen states. AVA
samples were obtained before the paver in three states. Statistical analysis (t-test) was conducted
at an alpha level of 0.05 to determine significance. The fifth paper presents data on
the heat signature of ternary mixes.
Fresh mortar samples were prepared and placed into 4-inch by 8-inch
cylinder with a thermocouple wire and then placed in a curing chamber at 70°F
for 24 hours. The heat signatures were
characterized and the results were modeled using slope 1 and slope 2, maximum
temperature, time-to-maximum temperature, area under the heat signature
curve, initial set, and final set. First
International Symposium on Transportation and Development Innovative
Practices April 24-26, 2008 in 11th
International Conference on Durability of Building Materials May 11-14, 2008 in Symposium
on Mechanics of Pavements and Paving Materials During the inaugural International
Conference of the Engineering Mechanics Institute (EM08) May 18-21, 2008 in 10th
International Conference on Application of Advanced Technologies in
Transportation - AATT 2008 May 27-31, 2008 in Athens, Greece 6th
RILEM International Conference on Pavement Cracking June 16-18, 2008 in Chicago, Illinois,
USA 13th
International Conference on Alkali-Aggregate Reaction in Concrete 2008 (ICAAR) June 16-19,
2008 in Trondheim, Norway 5th International ACI/CANMET
Conference on High Performance Concrete 2nd
International Conference on "Advances in Concrete and Structures" June 19-21,
2008 in Changsha, China 6th
International Conference on Road and Airfield Pavement Technology July 20-23, 2008
in http://www.jsce.or.jp/committee/pavement/icpt2008.html
August 13-15, 2008 in http://www.concretepavements.org/9thiccp/
Organized by ISCP August 17-21,
2008 in San Francisco, California, USA http://www.concretepavements.org/9thiccp/ 8th
International Conference on Creep, Shrinkage, and Durability of Concrete and
Concrete Structures (CONCREEP 8) September 30 - October 2, 2008 in http://concrete-lab.civil.nagoya-u.ac.jp/concreep8/ 3rd
International Conference on Accelerated Pavement Testing October 1-3, 2008 in ASCE
TD&I Pavement Conference October 15-18, 2008 in http://content.asce.org/conferences/pavements2008/ ACI Fall Convention
May 25-29, 2009 in Xi'an, China http://www.concretepavements.org/ Eighth
International Conference on the Bearing Capacity of Roads, Railways and
Airfields June 29 - July 2, 2009 in Champaign,
Illinois, USA GeoHunan International Conference
on Challenges and Recent Advances in Pavement Technologies and Transportation
Geotechnics 11th International Symposium on
Concrete Roads
Organized by ISCP Tentatively scheduled for August 2012 in http://www.concretepavements.org/ If you wish to
submit an announcement and/or link for an upcoming conference, meeting, or
call for papers for the next ISCP e-newsletter, please contact us at newsletter@concretepavements.org. The
ISCP Newsletter is produced by Editor-in-Chief, Amanda Bordelon, Associate
Editor, Dr. Jake Hiller, and Assistant Editors: Cristian Gaedicke and Nancy
Whiting. Suggestions for future
e-newsletters are welcomed at newsletter@concretepavements.org.
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