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Aashto T309M

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71 views4 pages

Aashto T309M

Uploaded by

Đạo Phạm
Copyright
© © All Rights Reserved
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Standard Method of Test for Temperature of Freshly Mixed Hydraulic- Cement Concrete AASHTO Designation: T 309M/T 309-05 ASTM Designation: C 1064/C 1064M-04 1, The values stated in SI units are to be regarded as the standard. 2. All references to ASTM standards contained in ASTM C 1064/C 1064M-04, listed in the following table, shall be replaced with the comesponding AASHTO standard. __ Referenced Standards ASTM ‘AASHTO em Tit 3. Replace Sections 4.2 and 4.4 of ASTM C 1064/C 1064M-04 with the following: 4.2 Temperature Measuring Device —The temperature measuring device shall be capable of measuring the temperature ofthe freshly mixed concrete to £0.5*C (41°F) throughout the entire temperature range likely to be encountered inthe fresh concrete, Liquid-in-glass thermometers having @ range of -18 to 49°C (0 to 120°F) are satisfactory. Other thermometers of the required accuracy, including the metal immersion type, are acceptable. 44 Reference Temperature Measuring Device—The reference temperature measuring device shall bea liguid-in-glass thermometer readable to 0.2°C (0.5*F) that has been verified and calibrated. The calibration certificate or report indicating conformance tothe requirements of ASTME 77 shall be available for inspection 4, Replace Section 5 of ASTM C 1064/C 1064M-04 with the following: 5. Calibration of Temperature Measuring Device 5.1 Each temperature measuring device used for determining temperature of freshly mixed concrete shall be calibrated annually, or whenever there is a question of accuracy. This calibration shall be performed by comparing the readings on the temperature measuring device at two temperatures at least 15°C (27°F) apart. TS-3b 73094 ‘AASHTO. jesignation: C 1064/C 1064M — 04 ‘Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete’ ‘This iad unr ened signin C GAC 106M: the nab mde fling te dean nds he ea fea wpe te cae elon, be eu ofl weve. A uber npr ie he ea of last ‘eal A supe epson) ects m ta change se helt eon ce ep, Ths nda has Ben apr for eb ene te Department of Dees 1. Scope* 1.1. This test method covers the determination of tempera- lure of freshly mixed hydraulic-cement conerete. 1.2 The values stated in inch-pound or SI units sre to be regarded separately as standard. Within the text, ST units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used inde- pendent ofthe other. Combining values from the two systems ‘may result in nonconformance with the specification, 1.3 The text ofthis standard references notes and footnotes that provide explanatory information. These notes and foot- notes (excluding those in tables and figures) shall not be considered as requirements of this standard. 1.4 This standard does not purport to address all of the safety concems, if any, associated with its use. It is the responsibiliy ofthe user of this standard to establish appro Driate safety and health practices and determine the applica bility of regulatory limitations prior to se. (Waraing-—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burs to skin and tissue upon prolonged exposure) 2, Referenced Documents 2.1 ASTM Standards: 3 C172 Practice for Sampling Freshly Mixed Concrete 3. Significance and Use 3.1 This test method provides a means for measuring the ‘temperature of freshly mixed concrete. It may be used to verify conformance 10 a specified requirement for temperature of ‘concrete. "This tet rd is wader te jasdctn of ASTM Commitee 8 on cones and Cnet Ages ads be de eons of Seon (im on Tsing Fresh Coe ‘Cares econ apeoved|204 Pia ay 00 Ol apron in 1 Lat previo cn apne in 208 a 64-08, ® Sasi on Sle Puts, Vana f Aggepas aod Conte Teng Ae! Bok of ASTM Senay, “Tur eewnced ASTM sails, vst he ASTM web Weng onias ASTA Cisne See at sees For Amal Bok STM ‘Stent vlan vom, eo he sar Dace Summ) Ps IMEASTNC nee 3.2 Concrete containing aggregate of ¢ nominal maximum size gteater than 3 in, [75 mm] may require up to 20 min forthe transfer of heat from aggregate to mortar. (See ACI Committee 207.1R Report’) 4. Apparatus 4.1 Container, shal be large enough to provide at least 3 in [75 mm] of concrete i all directions around the sensor of the temperature measuring device; concrete cover must also be at least three times the nominal maximum size of the coarse aggregate. 4.2 Temperature Measuring Device, shall be capable of accurately measuring the temperature of the freshly mixed concrete to =1°F [0:5°C throughout «range of 30°10 120°F [0° to SO°C}, The design of the temperature measuring device shall be sock that i allows 3 in. (75 mam] or more immersion ‘during operation. 43 Panial immersion liquid-in-gass thermometers (and possibly other types) shall have a permanent mak to which the device must be immersed without applying a comrecton factor. 44 Reference Temperature Measuring Device, shall be readable and accurate to £0:5°F (0.2°C} at the verification Point in 5.1. A certificate or report that verifies the accuracy shall be available inthe laboratory for review. Accuracy of liguid-in-gass reference temperature measuring devices shall be vetted once. Verification of direet-eading resistance ref erence temperature measuring. devices shall be performed every twelve months, The certificate or report shall provide documentation thatthe reference standard used in the verifi- cation is traceable to the National Institute of Standards and Technology (NISD) 5, Calibration of Temperature Measuring Device 5.1 Bach temperature measuring device used for determin- ‘ng temperature of freshly mixed concrete shall be calibrated annually, or whenever there is a question of accuracy. This “aan fom Amarin Comet estate, Box 994, Faring Hil, as 4 Summary of Changs section appears at he end of his standard, ag AST nao ar Harn 7O BOC, Not Cee ABD, eo Sa TS-36 T 309-2 ‘AASHTO Aly c t0641¢ 1064m — 04

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