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2016 Concrete Symposium
Ken Hover Visits the Valley
On Tuesday October 11, ACI Virginia welcomed Cornell University's Civil and Environmental Engineering professor Dr. Kenneth Hover to Roanoke to share his many years of wisdom and experience using concrete as a building material. This was Ken's 5th trip to Virginia to speak at an ACI sponsored event, although the first time to the western part of the state. This year's seminar was cosponsored by VRMCA's SW and Blue Ridge Promotional Councils, and featured an expanded format covering not just materials, but how and why the material works and doesn't work in real world jobsite applications.

This year, Ken added a review of concrete specifications, covering how and why particular specifications govern the types of mixes that are used on projects. He illustrated numerous examples of where the requirements for mixes originate, and also took the time to point out the differences between actual ACI specifications, and those documents ACI shares as reports not specifications. Ken is a registered professional engineer and the 2010-2012 President of ACI International, so his wisdom was certainly not lost on those in attendance. As the seminar neared completion, discussions were had on some of the problems that can be encountered on projects, including issues with entrained air and concrete pumpability.

Concrete Excellence Award
Winning Submission
Thanks go out to each of the companies that elected to submit a project for this year's Concrete Excellence Award. After much discussion this year's winner was selected as the Children's Hospital of Richmond at VCU.

The project is the Richmond region's largest outpatient facility dedicated to pediatric services. Included in the design are 11,000 yards of Mass Foundation, 4,600 yards of lightweight concrete, 15,000 yards of low permeability structural concrete, and 6,650 yards of high strength concrete. Other design features include stepped planters, an outdoor sky garden, and a three-story atrium. If you want to hear more about this project plan to attend the Virginia Concrete Conference.

Cold Weather Concrete
Tips to help you perform your best
As we approach winter, it's very common to think this isn't really that cold. But, as ACI notes, cold weather concrete is any period of three consecutive days with an average daily temperature below 40° F.



A few tips are listed below:


  • Initiate an action plan for cold weather concreteing to include on/in ground and above ground placements
  • Never place concrete on frozen ground - enclose area and heat or use insulating blankets prior to placement to increase temperatures to at least 50°F.
  • Use insulating forms for above ground placements.
  • Never use unvented heaters in enclosed placement areas.
  • Use accelerating admixtures as needed.
  • Increase cement content of concrete mix - +/-100 lbs / cubic yard

VA Chapter Nomination Wins First Place for ACI National Award
Children's Hospital of Richmond wins for High Rise Category
Nominated by the Virginia Chapter – ACI
Children’s Hospital of Richmond is a multi-story, 640,000 sq. ft., high-tech outpatient pavilion for pediatric services. The Children’s Pavilion will be the largest, most advance outpatient facility dedicated to children in the region, including diagnostic and treatment services for children.
11,000 cubic yards of 5000 and 7000 psi concrete was place in a mass foundation. Mass specification requirements had traditional high-temperature (160 F) and differential temperature (35 F) requirements. The mixtures needed to be pumped and have an SCC consistency to move through 6 to 7ft of highly reinforced mat with limited external consolidation.
Cast-in-place was used in 4600 cubic yards of 3500 psi pumped structural lightweight concrete; 15,000 cubic yards of low-permeability (1000 coulomb) 5000 psi pumped structural, fiber-reinforced concrete for the parking garage; and 6650 cubic yards of 7000 and 8000 psi high-performance for columns and shear walls.
The completed structure has been designed for future horizontal and vertical expansion.

Pictured below from left to right:
Shelley Wright- Vulcan Materials, Brian Stanley- Dunbar Milby Pitman Vaughan, Laura Aguilar – HKS, Mike Schneider – ACI President

Training Programs

ACI offers numerous programs to certify concrete craftsmen, technicians, supervisors, and inspectors. The following certification exams are offered by the Virginia Chapter of the American Concrete Institute. Click each program to get more information on each certification.

ATT1

Aggregate Testing Technician - Level 1

ACI Concrete Strength Testing Technician is an individual who has demonstrated the knowledge and ability to properly perform record and report the results of basic field and laboratory procedures for aggregates.

This class is recommended for laboratory technicians who are currently performing the tests listed below. Working knowledge of the following ASTM standards is helpful and strongly recommended.

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CSTT

Concrete Strength Testing Technician

ACI Concrete Strength Testing Technician is an individual who has demonstrated the knowledge and ability to properly perform record and report the results of four basic laboratory procedures related to the determination of concrete compressive and flexural strength.

This class is recommended for laboratory technicians who are currently performing the tests listed below. Working knowledge of the following ASTM standards is required.

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FF&T

Flatwork Finisher & Technician

A Concrete Flatwork Finisher is a craftsman who has demonstrated knowledge about and the ability to place, consolidate, finish, edge, joint, cure and protect concrete flatwork.

A Concrete Flatwork Technician is a person who is knowledgeable about proper procedures to place, consolidate, finish, edge, joint, cure and protect concrete flatwork, but who lacks sufficient work experience to qualify as a Concrete Flatwork Finisher.

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CIFT

Commercial/Industrial Flatwork Technician

A Concrete Flatwork Finisher is a craftsman who has demonstrated knowledge about and the ability to place, consolidate, finish, edge, joint, cure and protect concrete flatwork.

A Concrete Flatwork Technician is a person who is knowledgeable about proper procedures to place, consolidate, finish, edge, joint, cure and protect concrete flatwork, but who lacks sufficient work experience to qualify as a Concrete Flatwork Finisher.

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CTCI

Concrete Transportation Construction Inspector

A Concrete Transportation Construction Inspector is a person who has demonstrated proficiency in concrete inspection methods for transportation projects, including pre-placement, placement, and post-placement operations.

The program requires a knowledge of concrete construction, including plans reading, soil-cement, piling installations, formwork installation and removal, reinforcements, embedments, sampling and testing freshly mixed concrete, conveying, placing, consolidation, finishing, jointing curing, and protection.

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CLT2

Concrete Laboratory Testing Technician - Level 2

A Concrete Laboratory Testing Technician - Level 2 is an individual who has demonstrated the knowledge and ability to properly perform record and report the results of advanced laboratory procedures for aggregates and concrete.

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AAI1

Adhesive Anchor Installer

An Adhesive Anchor Installer is an individual who has demonstrated the ability to read, comprehend, and execute instructions to properly install adhesive anchors in concrete. This includes demonstrating knowledge to properly assess ambient conditions, concrete condition, materials, equipment, and tools for installing adhesive anchors and determines when it is appropriate to proceed with installation of an adhesive anchor or when to seek guidance from a supervisor/foreman/project engineer.

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Our Mission

The Virginia Chapter – Improving and encouraging the use of concrete in the Commonwealth of Virginia by providing opportunities for education, training and certification; advancing design, construction, and innovation of concrete by linking producers, suppliers, engineers, architects, contractors, owners and other industry individuals.