Designation: c 157/C 157M – 08 Standard Test Method for Length Change of Hardened Hydraulic-Cement Mortar and Concrete 1
Procedure for Calculating Length Change
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| 12. Procedure for Calculating Length Change
12.1 Comparator Reading—Read the comparator dial with the test specimen in the comparator; then read the comparator dial with the reference bar in the comparator. Calculate the difference between the two readings as described in Practice C 490 . 12.2 Length Change—Calculate the length change of any specimen at any age after the initial comparator reading as follows: DL x 5 CRD 2 initial CRD G 3 100 (1) where: DL x = length change of specimen at any age, %, CRD = difference between the comparator reading of the specimen and the reference bar at any age, and G = the gage length (10 in. [250 mm]) (see Note 4 ). N OTE 4—In Practice C 490 , the comparator dial gage specified for use with 10-in. gage length specimens shall be graduated in fractions of an inch; the comparator dial gage specified for use with 250-mm gage length specimens shall be graduated in fractions of a millimetre. 13. Report 13.1 Report the following information: 13.1.1 Identification as mortar or concrete specimens, num- ber of specimens for each condition, and date molded, 13.1.2 Source and identification of each material employed, 13.1.3 Type, maximum size, moisture condition, and grad- ing of the aggregate, 13.1.4 Size of specimens, 13.1.5 Mortar or concrete mixture data at time of mixing, including flow or slump and temperature of mixture, 13.1.6 Description of consolidation of concrete, specifying whether rodding or external vibration was used, 13.1.7 Conditions and periods of moist curing prior and subsequent to removal of molds, if different from those specified, 13.1.8 Description of storage condition, including tempera- ture and humidity, either by indicating whether the water or air storage was followed or by giving the details of any procedure not conforming to either of these conditions, 13.1.9 Total elapsed time of storage and total age of specimen, or total elapsed time of curing and storage if the same condition was used for both, 13.1.10 Length change data, reported as percent increase or decrease in linear dimension to the nearest 0.001 % of the gage length based on the initial measurement made at the time of removal from the molds, and 13.1.11 Any other pertinent information. tải về 128.58 Kb. Chia sẻ với bạn bè của bạn:
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