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1、J I S Ax1804 92 D 4933608 0506765 44T D UDC 666.972:658.562:666.972.12.015.64-915.3 JIS JAPAN ESE IN DUSTRIAL STANDARD Methods of test for production control of concrete -Method of rapid test for identification of the alkali reactivity of aggregates JIS A 1804-1992 Translated and Published by Japane
2、se Standards Association Printed in Japan 5 s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:23:52 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S Ax1804
3、 92 m 4933b08 050b7bb 38b m In the event of any doubt arising, the original Standard in Japanese is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:23:52 MSTNo rep
4、roduction or networking permitted without license from IHS -,-,- J I S A*L804 92 m V933bO8 050b7b7 212 = I- UDC 666.972: 658.562: 666.972.12.015.64-915.3 JAPANESE INDUSTRIAL STANDARD J I S Methods of test for production A 1804-1992 control of concrete - Method of rapid test for identification of the
5、 alkali reactivity of aggregates 1. ScoDe This Japanese Industrial Standard applies mainly to production control of concrete, and specifies the method of rapid test for identification of alkali-silica reactivity of aggregates in which the mortar bar is cured under high pressure and high temperature
6、and the characteristic changes are measured. Remarks 1. The following Standards are cited in this Standard: JIS A 1127 Method of Test for Dynamic Modulus of Elasticity, Rigidity and Dynamic Poissons Ratio of Concrete Specimens by Resonance Vibration JIS A 5308 Ready-Mixed Concrete JIS B 7509 Dial Ga
7、uges Reading in 0.001 mm JIS R 5201 Physical Testing Methods for Cement JIS Z 8401 Rules for Rounding Off of Numerical Values JIS Z 8801 Test Sieves 2. The units and numerical values given in Standard are based on the International System of Units (SI) and are appended for informative reference. The
8、 traditional units accompanied by numerical values in this Standard will be converted to the SI units and numerical values on April, 1, 1995. 1 in this 2. Equipment The equipment to be used for the test shall be as follows: (1) Balance The balance to serve for screening aggragates shall be of 2 kg w
9、eighing capacity and sensitivity 0.1 g. (2) Sieve The sieves shall be those of 150 um, 300 um, 600 um, 1.18 mm 2.36 mm and 4.75 mm in nominal size specified in JIS Z 8801. (3) Dryer The dryer shall be an electrical thermostatic dryer equipped =air stirrer and ventilator. (4) Crusher The crusher shal
10、l be capable of adjusting the grain size o f a g a t e s to 0.15 to 5 mm. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:23:52 MSTNo reproduction or networking permitted without license
11、 from IHS -,-,- J I S A*LBOY 92 Y933b08 0506768 159 m 2 A 1804-1992 Apparatus for preparing mortar mortar shall be the mixer, and the mold and tamping rod for molding mortar specimen specified in 9.1 (1) and 9.1 (2) of JIS R 5201, respectively. The apparatus for preparing In the case of measuring th
12、e length variation, the mold for molding mortar specimen may be that specified in Annex 8. Test method for potential alkali-silica reactivity of aggragates (mortar bar method) of JIS A 5038. Reaction accelerating device The reaction accelerating device shall be capable of adjusting the pressure to a
13、 gauge pressure 1.5 kgf/cm2 (150 kPa) (temperature 127OC), raising the gauge pressure to 1.5 kgf/ cm2 I150 kPa in 40 f 10 min at 4OoC, and adjusting the water tem- perature to 20 to 4OoC in 30 f 10 min. Measuring device for ultrasonic wave propagation velocity oscillator shall produce a longitudinal
14、 wave and include a frequency of 50 kHz. The The accuracy of reading propagation time shall be 0.1 us or better, and the indicator can display three significant digits. First -order resonance frequency measuring device The first-order resonance frequency measuring device shall be that specified in J
15、IS A 1127. Length variation measuring device The length variation measuring device shall have the construction exemplified in Fig. 1. consist of a length measuring frame equipped with a dial gauge as the main component and a supporting base is provided if necessary so that the scale of dial gauge is
16、 read while the specimen is inserted into the length measuring frame or the specimen is supported by the supporting base and the length measuring frame is placed to catch the specimen. It shall It shall comply with the following requirements: (a) The specimen supporting base shall be so constructed
17、that the base can support the specimen with its longitudinal axis horizontal or inclined at a constant angle to the horizontal and not move when the length of specimen is measured. (b) The length measuring frame shall be so constructed that in the measurement of the length variation of specimen, the
18、 axis connecting the contact of length measuring frame and the end of spindle of dial gauge can correctly coincide with the axis of specimen, and that the measurements, if repeated, can be done always under a certain conditions. (cl The dial gauge attached shall comply with the provisions of JIS B 7
19、509. (d) A standard rule by which the distance between the contact of length measuring frame and the end of spindle of gauge can easily be measured, shall be provided. 9 a a Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, B
20、ernie Not for Resale, 03/11/2007 00:23:52 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S A*L804 92 m 4933b08 050b7b9 095 m 1 a 3 A 1804-1992 Fig. 1. An example of length variation measuring device Contact of length measuring frame End of spindle Specimen 4 Unit: mm 9
21、4 _I_ - 33 i 28-1-25 I 1 4 0 =I 3. SamDle Air dried aggregates shall be crushed, screened into 150 to 300 pm, 300 to 600 um, 600 urn to 1.18 mm, 1.18 to 2.36 mm and 2.36 to 4.75 mm, cleaned in water, dried at 105 to llOC until the mass is stabilized. Aggregates of grain size 150 to 300 pm shall be s
22、ampled by 90 g, 300 to 600 pm by 150 g, 600 pm to 1.18 mm by 150 g, 1.18 to 2.36 mm by 150 g, and 2.36 to 4.75 mm by 60 g, and the mixture shall be used as the sample. 4. Test method The test shall be carried out as follows: a (1) Mixing method of mortar Fix the mixing bowl and the paddle to the mix
23、ing positions of the mixer body, and put the aggregate sample, normal portland cement (l) of 600 g and standard TOYOURA sand of 600 g in the mixer. while rotating the mixer for 30 s and rest it for 20 s. off the mortar adhering to the mixing bowl and paddle with a spoon. Further mix the mortar two o
24、r three times by scraping up the mortar in the bottom of the mixing bowl. again and mix the mortar for 120 s. Notes ( l ) (*) Start the mixer, carry out mixing for 30 s addle, stop the mixer and then put aqueous solution of NaOH ( ! i ) of 300 g in the mixer. Successively run the During the rest per
25、iod scrape After the rest run the mixer Use the cement specified in 5.2 of Annex 8. of JIS A 5308. The concentration of aqueous solution of NaOH shall be so adjusted that the total amount of alkali (converted to Na,O) in the mortar is 2.50 % of the mass of cement. Copyright Japanese Standards Associ
26、ation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:23:52 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S A*L804 i2 m 4933b08 0506770 807 m 4 A 1804-1992 I (2) Preparation and curing of specime
27、n The preparation method of specimen shall be as specified in 9. (strength test) of JIS R 5201. Tamp the mortar 15 times for each layer, and carry out the surface finish of the specimen within 20 min after the molding. specimen shall be a rectangular solid of 4 x 4 x 16 c m (gauge plug may be attach
28、ed when length variation is measured). specimen so molded in the wet box at a temperature 20 f 2OC and a relative humidity 95 8 or more for 24 h, take it out of the mold and cure it in water at a temperature 20 i 2OC for 24 h. Prepare three such specimens. The Cure the (3) Measurement of ultrasonic
29、wave propagation velocity, dynamic elastic modulus or length variation specimens cured in water, measure one of the ultrasonic wave Wipe off the water on the surface of propagation velocity, the first-order resonance frequency by longitudinal vibration or the length, immerse the specimens into water
30、 at 40OC, raise the pressure to a gauge pressure 1.5 kgf/cm2 E150 kPa (temperature 127OC) in 40 f 10 min, and boil them for 4 h under the said pressure. After boiling, make the water temperature 20 to 40OC in 30 f 10 min by pouring water, and then carry out measurement as follows : a (a) In the case
31、 of ultrasonic wave propagation velocity or first-order resonance frequency by longitudinal vibration, take out the specimen from water, wipe off the water on the surface and then carry out the measurement. (b) In the case of length variation, further immerse the specimen into water at 20 +- 2OC for
32、 at least 1 h, take it out from water, wipe off the water on the surface, and then carry out the measurement (3). Note (3) When the gauge plugs are not used, make the direction of specimen at the measurement before boiling identical to that after boiling. a 5. Calculation Carry out the calculation a
33、s given below and obtain the average value on three specimens. ( 1) Ultrasonic wave propagation velocity rate Calculate the ultrasonic wave propagation rate from the formula given below and round it off to first decimal place according to JIS Z 8401. Y,=& 100 C where, r, : ultrasonic wave propagatio
34、n velocity rate (%I c : ultrasonic wave propagation velocity before boiling (m/s) C : ultrasonic wave propagation velocity after boiling (m/s) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/200
35、7 00:23:52 MSTNo reproduction or networking permitted without license from IHS -,-,- a 3 J I S A*l1804 92 m 4933608 050b77L 743 m a a ! 5 A 1804-1992 Relative dynamic elastic modulus Calculate the relative dynamic elastic modulus from the formula given below and round it off to first decimal place a
36、ccording to JIS Z 8401. (u) E=-(v)2x 100 where, E: relative dynamic elastic modulus (%) u : first-order resonance frequency before bailing (Hz) U : first-order resonance frequency after boiling (Hz) Length variation rate lormula given below and round it off to third decimal place according to JIS Z
37、8401. Calculate the length variation rate from the where, AL: length variation rate (%) X : reading of dial gauge on specimen before boiling s X : reading of dial gauge on standard rule measured at same time x: reading of dial gauge on specimen after boiling SX: reading of dial gauge on standard rul
38、e measured at same time L : effective gauge length (4) (distance between inside ends of gauge plug) (Units of X, SX , x sX and L shall be identical 1 Note (4) The effective length differs according to the gauge plug, therefore, care shall be taken. This is the length of specimen when the gauge plug
39、is not used. 6. Precision The precision shall be as stated below. If the test results do not satisfy the stated precision, a retest shall be carried out. specimens do not satisfy the criteria, a decision shall be made without the precision taken into account. If all the three (1) Ultrasonic wave pro
40、pagation velocity rate The difference between the average ultrasonic wave propagation velocity rate on three specimens and the ultrasonic wave propagation velocity rate of an individual specimen shall not exceed 0.5 %. Copyright Japanese Standards Association Provided by IHS under license with JSALi
41、censee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:23:52 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S A*L8OY 92 m 4933b08 0506772 b8T m 6. A 1804-1992 I v variation rate of an individual specimen shali not exceed 0.010 %. I (2) Relativ
42、e dynamic elastic modulus The difference between the average relative dynamic elastic modulus on three specimens and the relative dynamic elastic modulus of an individual specimen shall not exceed 1.5 8. 7. Decision (3) Length variation rate The difference between absolute values of the average leng
43、th variation rate on three specimens and the length I (2) Relative dynamic elastic modulus is 85 8 or more. The decision shall be made based on any one of the ultrasonic wave propagation velocity rate or the relative dynamic elastic modulus rounded off to an integer according to JIS Z 8401, or the l
44、ength variation rate rounded off to the second decimal place according to JIS Z 8401, and shall be decided as “harmlesst1 when the requirements given below are satisfied or as “not harmlesstt when the requirements are not satisfied. (i) Ultrasonic wave propagation velocity rate is 95 % or more. (3)
45、Length variation rate is less than 0.10 %. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:23:52 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S A81804 92
46、 m 4933608 0506773 516 m . A 1804-1992 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment : 1992-03-01 Date of Public Notice in Official Gazette: 1992-04-28 Investigated by: Japanese Industrial Standards Committee Divisional Council on Civil Eng
47、ineering This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku , Tokyo 107 Japan O JSA, 1992 Rinted in Tokyo by Hohbunsha Co., Ltd. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:23:52 MSTNo reproduction or networking permitted without license from IHS -,-,-