EPDACI chapter meetings are generally held in September, November, January, March and May. Meetings are being planned for the tentative dates in the Spring. Meeting information will be posted to this page when available.
March Dinner Meeting
The 90 Minute Rule in Ready Mix
Time for a Change?
Mohemed Mahgoub PhD, PE
New Jersey Institute of Technology
|TIME:||Thursday,||March 23, 2017|
|Reserved||At the Door|
|COST:||EPD Chapter Members and Guests||$50||$55|
|EPD Chapter Non-Members||$60||$65|
|EPD Chapter Student Members||$15||$20|
|EPD Chapter Non-Member Students||$20||$25|
P.O. Box 9149
Wilmington, DE 19809-0149
|by||Deadline:||Monday, March 20, 2017|
You can obtain a copy of the Announcement and Registration Form by calling (302) 765-3732 or download a copy by clicking the link below:
Dinner Mtg 0317.pdf
Adobe Acrobat document [193.6 KB]
Payments may be made by check or cash. First, complete and return Registration Form to EPD ACI as indicated above. Next:
(1) Mail check with Registration Form to EPD ACI (address above), or
(2) Pay by cash or check at the door.
Please note that all payments are final and nonrefundable.
Many concrete specifications include the use of 90-minute time limit from the time of batching as an acceptance criteria for safe discharge and utilization of ready-mix concrete. This is specified in ACI 318 5.8.2 and derived from ASTM C94 section 12.7, which states, “Discharge of the ready mix concrete shall be completed within 1-1/2 hrs after the introduction of the mixing water to the cement and aggregates, or the introduction of the cement to the aggregates.” ASTM C-94 further states that, “This limitation may be waived,” providing additional evaluation information. However, strict interpretation of the 90-minute time limit has led to a sizable number of truckloads of ‘good quality’ ready-mixed concrete being rejected every year.
In an effort to address this issue and provide additional evaluation information, Dr. Mahgoub and his research team at New Jersey Institute of Technology pursued the research titled, “Evaluation of the 90- minute rule as an acceptance criteria considering current concrete mix design technology and mix constituents.” Research was funded by the New Jersey Chapter of The American Concrete Institute (NJACI) and Concrete Industry Management Program at NJIT. Three different concrete mixes: fly-ash concrete, slag concrete and normal concrete, were evaluated under different weather conditions and elapsed times (up to 180 minutes) to gain better understanding of how elapsed time affects quality of the concrete load. Concrete samples were tested for compressive strength (ASTM C39), flexural strength (ASTM C78), shrinkage test (ASTM C157) and concrete permeability (Coulomb Test). The intriguing results would be beneficial to concrete suppliers, engineers and inspectors in the concrete industry.
Mohamed Mahgoub is an NJIT Associate Professor and Concrete Industry Management Program Director. He is an expert in bridge rehabilitation, inspection, rating, design and analysis. Prior to joining NJIT, he was the lead bridge engineer for the Chicago consulting firm Alfred Benesch & Company, working out of Lansing, Michigan on bridge design for the Michigan Department of Transportation (MDOT). Earlier, he was a structural engineer for an Egyptian engineering consulting firm where he gained experience in designing building structures and construction.
Dr. Mahgoub is a professional engineer that has served as a member in several concrete industry related organizations such as American Society of Civil Engineers (ASCE), Precast/Prestressed Concrete Institute (PCI), International Concrete Repair Institute (ICRI), and American Concrete Institute (ACI). For ACI, he has participated in activities since 2003. These activities include special publication chapter authoring, committee presentations, session moderation, and served as a member of five committees. Because of this, he has been appointed by ACI as the Chair of Committee 555 (Concrete with Recycled Materials) for two three-year terms which run through March, 2018. Dr. Mahgoub has more than 20 technical and scientific publications and presentations to his credit. In addition, he has been selected to be a reviewer for several reputable journals such as ACI Materials and Structural Journals, ASCE Bridge Journal, PCI Journal, and American Society for Testing and Materials (ASTM) International Journal. Dr. Mahgoub has been also serving as a panelist for the National Science Foundation (NSF) and National Research Council (NRC).
Directions to Maggiano's Little Italy
From the North: Take the Pennsylvania Turnpike West to Exit 326 (Valley Forge). Take Exit 328 (N Gulph Rd). Turn left onto N Gulph Rd. Turn left onto Mall Blvd. Restaurant is on the right.
From the South: Take 95 North to Route 476 North (Exit 7). Take 76 West (Schuylkill Expressway) following signs for Valley Forge to Exit 327 (Mall Blvd). Continue straight, then right onto King of Prussia Plaza. Restaurant is 300 feet on right.
From the East: Take the Atlantic City Expressway to Route 42 to the Walt Whitman Bridge. Follow 76 (Schuylkill Expressway West) to
Exit 327 (Mall Blvd). Continue straight, then right onto King of Prussia Plaza. Restaurant is 300 feet on right.
From the West: Take the Pennsylvania Turnpike to Exit 326 (Valley Forge). Take Exit 328 (N Gulph Rd). Turn left onto N Gulph Rd. Turn left onto Mall Blvd. Restaurant is on the right.
From Philadelphia International Airport: Take 95 South to Route 476 North (Exit 7). Take 76 West (Schuylkill Expressway) following signs for Valley Forge to Exit 327 (Mall Blvd). Continue straight, then right onto King of Prussia Plaza. Restaurant is 300 feet on right.
Calendar of Events
Tentative Schedule of Certification Course and Exam Dates may be found here.
Board of Directors
March 3, 2017 - Board of Directors Meeting, 8:30 a.m., Doubletree Valley Forge Hotel, King of Prussia, PA. All interested chapter members are encouraged to attend. RSVP, call 302-765-3732 or click here.
Spring 2017 Convention
Detroit - March 26-30, 2017. For more information, click here.
Student Beam Competition
April 1, 2017 - 9:30 a.m. at Widener University Structures Lab, Chester, PA. For more information click here.
2017- to be updated. We are looking for volunteers to help organize For more information, click here.