AWWA Articles

AWWA Comment Period on ANSI/AWWA D115-19 – Tendon-Prestressed Concrete Water Tanks

AWWA Comment Period on ANSI/AWWA D115-19 – Tendon-Prestressed Concrete Water Tanks
November 22, 2019

AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins the 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing ETS Support. Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter's position, concerns and suggested alternative language, if appropriate.

AWWA Comment Period closes on January 6, 2020.

Send comments to:
Frank Kurtz
303.347.6221 phone
303.795.7603 fax

The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.

Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal - American Water Works Association. The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal - American Water Works Association

SCOPE
This standard describes current and recommended practice for the design, construction, and field observations of concrete tanks using internal tendons for prestressing. This standard applies to containment structures for use with potable water, raw water, or wastewater.

MAJOR REVISIONS
Major changes made to the standard in this edition include the following:
1. Provisions for waterstops have been updated (Sec. 2.7.1.2).
2. A one-third increase in the minimum concrete cover has been added for prestressed concrete members exposed to earth, weather, or corrosive environments and in which the tensile stresses exceed 6 √ƒ'c  (Sec. 3.11.1.1).
3. Provisions for resistance to sliding caused by horizontal forces have been added (Sec. 4.9.4).
4. Confirmation of concrete stressing strength by pullout tests (ASTM C900) has been removed (Sec. 5.2.4.4). 
5. For floor slabs, the requirement that curing compounds are not permitted instead of water curing has been removed (Sec. 5.2.5.3). 
6. The allowable alignment tolerance between the centroids of adjoining precast concrete panels has changed from 3/16 in. to 3/8 in. (Sec. 5.6.4.1).


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