AASHTO T 352-2014 Standard Method of Test for Determining Formwork Pressure of Fresh Self-Consolidating Concrete (SCC) Using Pressure Transducers.pdf
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1、Standard Method of Test for Determining Formwork Pressure of Fresh Self-Consolidating Concrete (SCC) Using Pressure Transducers AASHTO Designation: T 352-141American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-3b T 352-
2、1 AASHTO Standard Method of Test for Determining Formwork Pressure of Fresh Self-Consolidating Concrete (SCC) Using Pressure Transducers AASHTO Designation: T 352-1411. SCOPE 1.1. This method covers the measurement of formwork pressure of fresh self-consolidating concrete (SCC) using pressure transd
3、ucers attached to formwork. 1.2. This is a field test with the intention of measuring formwork pressure during placement of SCC. 1.3. The text of this standard references notes that provide explanatory information. These notes shall not be considered as requirements for this standard. 1.4. The value
4、s stated in SI units are to be regarded as the standard. 1.5. This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to esta
5、blish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. REFERENCED DOCUMENTS 2.1. ASTM Standard: C125, Standard Terminology Relating to Concrete and Concrete Aggregates 3. SIGNIFICANCE AND USE 3.1. This method is applicable when there
6、is a concern about SCC form pressures that may exceed the rated strength of the formwork. SCC shall be defined by ASTM C125. Note 1Formwork less than or equal to 3 m (10 ft) tall constructed of commercial forms rated at 57.5 kPa (1200 lb/ft2) or greater may be able to resist the SCC pressures encoun
7、tered in the field; however, the engineer is still responsible for the formwork design. 4. APPARATUS AND MATERIALS 4.1. Pressure TransducerA suitable pressure transducer for measuring pressure from SCC. 2015 by the American Association of State Highway and Transportation Officials.All rights reserve
8、d. Duplication is a violation of applicable law.TS-3b T 352-2 AASHTO Figure 1Pressure Transducer 4.2. Data Acquisition SystemA suitable data acquisition interface for obtaining pressure readings from pressure transducers. 4.3. BracketA bracket conforming to the pressure transducer and formwork geome
9、try shall be used for attaching the pressure transducer to the formwork. Figures 2 and 3 show one such bracket system. Figure 2Bracket for Attaching Pressure Transducer to Formwork 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a vi
10、olation of applicable law.TS-3b T 352-3 AASHTO Figure 3Bracket with Pressure Transducer Attached to Formwork 4.4. Portable Hand Drill and BitA suitable drill and bit for drilling pressure transducer access holes. 4.5. Baby Powder and Cellophane WrapSuitable materials for covering the pressure transd
11、ucer face. Note 2A Vishay Model P3 Strain Indicator and Recorder with Honeywell Model AB/HP pressure transducers have been used for measuring pressures from SCC. The Vishay unit will accommodate four pressure transducers, and the required access hole for the Honeywell Model AB/HP pressure transducer
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