AASHTO M 302-2015 Standard Specification for Slag Cement for Use in Concrete and Mortars.pdf

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1、Standard Specification for Slag Cement for Use in Concrete and Mortars AASHTO Designation: M 302-15 ASTM Designation: C989-14 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-3b M 302-1 AASHTO Standard Specification

2、 for Slag Cement for Use in Concrete and Mortars AASHTO Designation: M 302-15 ASTM Designation: C989-14 1. SCOPE 1.1. This specification covers slag cement for use as a cementitious material in concrete and mortar. 1.2. The values stated in SI units are to be regarded as standard. The values given i

3、n parentheses are given for information only. 1.3. The following safety hazards caveat pertains only to the test methods described in this specification. 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 thi

4、s standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.4. The text of this standard references notes that provide explanatory information. These notes and footnotes (excluding those in tables) shall not be considered

5、as requirements of this standard. Note 1The material described in this specification may be used for blending with portland cement to produce a cement meeting the requirements of M 240M/M 240 or as a separate ingredient in concrete or mortar mixtures. The material may also be useful in a variety of

6、special grouts and mortars and, when used with an appropriate activator, as the principal cementitious material in some applications. Note 2Information on technical aspects of the use of the material described in this specification is contained in Appendix A. More detailed information on that subjec

7、t is contained in ACI 233R-03, formerly ACI 226.1R. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 6, Fine Aggregate for Hydraulic Cement Concrete M 80, Coarse Aggregate for Hydraulic Cement Concrete M 85, Portland Cement M 240M/M 240, Blended Hydraulic Cement T 105, Chemical Analysis of Hydraulic

8、 Cement T 106M/T 106, Compressive Strength of Hydraulic Cement Mortar (Using 50-mm or 2-in. Cube Specimens) T 133, Density of Hydraulic Cement T 137, Air Content of Hydraulic Cement Mortar 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication

9、 is a violation of applicable law.TS-3b M 302-2 AASHTO T 153, Fineness of Hydraulic Cement by Air Permeability Apparatus T 192, Fineness of Hydraulic Cement by the 45-m (No. 325) Sieve 2.2. ASTM Standards: C125, Standard Terminology Relating to Concrete and Concrete Aggregates C441/C441M, Standard T

10、est Method for Effectiveness of Pozzolans or Ground Blast-Furnace Slag in Preventing Excessive Expansion of Concrete Due to the Alkali-Silica Reaction C452/C452M, Standard Test Method for Potential Expansion of Portland-Cement Mortars Exposed to Sulfate C465, Standard Specification for Processing Ad

11、ditions for Use in the Manufacture of Hydraulic Cements C1012/C1012M, Standard Test Method for Length Change of Hydraulic-Cement Mortars Exposed to a Sulfate Solution C1038/C1038M, Standard Test Method for Expansion of Hydraulic Cement Mortar Bars Stored in Water D3665, Standard Practice for Random

12、Sampling of Construction Materials 2.3. American Concrete Institute Reports: 226.1R, Ground Granulated Blast-Furnace Slag as a Cementitious Constituent in Concrete1 233R-03, Slag in Concrete and Mortar 3. TERMINOLOGY 3.1. Definitions: 3.1.1. blast-furnace slagthe nonmetallic product, consisting esse

13、ntially of silicates and aluminosilicates of calcium and other bases that is developed in a molten condition simultaneously with iron in a blast furnace. (See ASTM C125.) 3.2. Descriptions of Terms Specific to This Standard: 3.2.1. granulated blast-furnace slagthe glassy granular material formed whe

14、n molten blast-furnace slag is rapidly chilled as by immersion in water. (See ASTM C125.) Compositional adjustments may be made while the blast-furnace slag is molten. 3.2.2. slag cementgranulated blast-furnace slag, as defined and described in Sections 3.1.1 and 3.2.1 and ground to cement fineness

15、with or without additions meeting the requirements of the section on additions. 4. CLASSIFICATION 4.1. Slag is classified by performance in the slag activity test in three grades: Grade 80, Grade 100, and Grade 120. (See Table 1.) 5. ORDERING INFORMATION 5.1. The purchaser shall specify the grade sl

16、ag desired and the optional chemical or physical data to be reported. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3b M 302-3 AASHTO 6. ADDITIONS 6.1. The slag cement covered by this specification

17、shall contain no additions except as follows: 6.1.1. It is permissible to add calcium sulfate to slag cement provided it has been demonstrated by ASTM C1038/C1038M that a test mixture will not develop expansion in water exceeding 0.020 percent at 14 days. In the test mixture, 50 percent of the mass

18、of portland cement shall be replaced by an equal mass of slag cement. The portland cement used in the test mixture shall meet the requirements of M 85. When the manufacturer supplies cement under this provision, upon request, supporting data shall be supplied to the purchaser. 6.1.2. Processing addi

19、tions may be used in the manufacture of the slag cement, provided such materials, in the amounts used, have been shown to meet the requirements of ASTM C465 when tested using a blend that is 50 percent slag cement and 50 percent portland cement by mass. 7. PHYSICAL PROPERTIES 7.1. Slag cement shall

20、conform to the physical requirements of Table 1. Table 1Physical Requirements Item Fineness: Amount retained when wet- screened on a 45-m (No. 325) sieve, max percent 20 Specific surface by air permeability, Method T 153 shall be determined and reported although no limits are required Air content of

21、 slag cement mortar, max percent 12 Slag Cement Activity IndexaAverage of Last 5 Consecutive Samples Any Individual Sample 28- or 56b-Day index, Min, Percent: Grade 80 75 70 Grade 100 95 90 Grade 120 115 110 a7-Day Slag Activity Index shall be determined on Grades 100 and 120 and reported for inform

22、ational purposes. bOnly applicable when testing at 56 days is specified. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3b M 302-4 AASHTO 8. CHEMICAL COMPOSITION 8.1. Slag cement shall conform to the

23、 chemical requirements prescribed in Table 2. Table 2Chemical Requirements Sulfide sulfur (S), max percent 2.5 Note 3Sulfur in slag cement is present predominantly as sulfide sulfur. In most cases, instrumental analyses, such as x-ray fluorescence, cannot differentiate sulfide sulfur from sulfate. D

24、etermine and report the sulfide sulfur content separately and do not include it in the SO3calculations. 9. SAMPLING 9.1. The following sampling and testing procedures shall be used by the purchaser to verify compliance with this specification. 9.2. Take random grab samples either from a delivery uni

25、t or at some point in the loading or unloading process so that no sample represents more than 115 Mg (125 tons) (Note 4). If samples are taken from rail cars or trucks, take at least two separate 2-kg (5-lb) portions and thoroughly mix them to obtain a test sample (Note 5). Sample by removing approx

26、imately a 300-mm (12-in.) layer of slag cement. Make a hole before obtaining a sample to avoid dust collector material that may be discharged into the delivery unit after the slag cement flow ceases. Sample at a rate of ten samples per month or one sample for each 2300 Mg (2500 tons) of shipments, w

27、hichever is more frequent. Note 4Standard statistical procedures are recommended for ensuring that samples are selected by a random procedure; see ASTM D3665. These procedures can be used to select the days within a month or within a week that samples will be taken. The delivery unit or time of day

28、then should be chosen randomly. Note 5The quantity of sample specified is more than adequate for the testing required. A 2-kg (5-lb) portion should be retained in a sealed container for retesting if that is considered necessary to verify compliance. 10. TEST METHODS 10.1. Slag-Activity Tests with Po

29、rtland Cement: 10.1.1. Slag cement activity shall be evaluated by determining the compressive strength of both portland-cement mortars and corresponding mortars made with the same mass of blend that is 50 percent slag cement and 50 percent portland cement by mass. Note 6Appendix X1 discusses the eff

30、ects of cement, temperature, and amount of slag cement used on performance with portland cement. 10.1.2. Reference CementThe portland cement used in the slag cement activity tests shall comply with the standard chemical and physical requirements of M 85, Type I or Type II, with the additional requir

31、ements of total alkali content and compressive strength limits as shown in Table 3. Sufficient cement shall be reserved to avoid changing reference cement more often than every 2 months. Following the compressive strength requirement of Table 3, the referenced cement shall be requalified at interval

32、s no greater than 6 months. Note 7Different reference cements may produce different Slag Cement Activity Index results. Reference portland cement meeting the requirements of Section 10.1.2 is available from CCRL.2 2015 by the American Association of State Highway and Transportation Officials.All rig

33、hts reserved. Duplication is a violation of applicable law.TS-3b M 302-5 AASHTO Table 3Alkali and Strength Limits of Reference Cement for Slag Cement Activity Tests Total alkalies (Na2O + 0.658 K2O) min percent max percent 0.60 0.90 Compressive strength, MPa, min 28 daysa35 (5000 psi) a The minimum

34、strength limit is based solely on the strength of the T 106M/T 106 mortar cubes, as required in M 85, regardless of the strength of the flow-controlled M 302 mortar cubes. 10.1.3. Preparation of SpecimensPrepare mortars in accordance with T 106M/T 106, except that sufficient water shall be used in e

35、ach batch to produce a flow of 110 5 percent. The proportions of dry ingredients shall be as follows: Reference Cement Mortar: 500 g portland cement 1375 g graded standard sand Slag-Reference Cement Mortar: 250 g portland cement 250 g slag 1375 g graded standard sand 10.1.3.1. Mix a reference cement

36、 batch each day that a slag-reference cement batch is mixed until at least five batches have been mixed with the reference cement. Thereafter, reference cement batches need not be mixed more often than once a week whenever slag cement is being produced or shipped. 10.1.4. Test AgesDetermine the comp

37、ressive strength of mortar specimens at 7 and 28 days of age in accordance with T 106M/T 106. 10.1.5. CalculationCalculate the slag cement activity index to the nearest percent for both 7 days and 28 days as follows: slag cement activity index, percent = (SP/P) 100 where: SP = average compressive st

38、rength of slag-reference cement mortar cubes at designated ages, MPa (psi); and P = average compressive strength of reference cement mortar cubes at designated age, MPa (psi). The reference cement-mortar strength used to calculate the slag cement activity index shall, when a reference cement mortar

39、is mixed on the same day as a slag-reference cement mortar, be the result for that batch. Otherwise, the average of tests of the five most recent reference cement-mortar batches shall be used. 10.1.6. ReportThe report should include the following: 10.1.6.1. Slag cement activity index, percent; 10.1.

40、6.2. Compressive strength at 7 and 28 days of slag-reference cement mortar; 10.1.6.3. Compressive strength at 7 and 28 days of portland cement mortar; 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3

41、b M 302-6 AASHTO 10.1.6.4. Total alkalies of the reference cement (Na2O + 0.658 K2O); 10.1.6.5. Fineness of reference cement; and 10.1.6.6. Potential compound composition of the reference portland cement. 10.1.7. PrecisionThe following precision statements are applicable when the slag cement activit

42、y index with portland cement is based on results of tests of two cubes from single batches of reference cement and 50/50 slag-reference cement mortars mixed on the same day. They are applicable to the slag cement activity index determined at 7 or 28 days. 10.1.7.1. The single-laboratory coefficient

43、of variation has been found to be 4.1 percent. Therefore, the slag cement activity index based on single batches of mortar mixed on the same day should not differ by more than 11.6 percent of their average. 10.1.7.2. The multilaboratory coefficient of variation has been found to be 5.7 percent. Ther

44、efore, the slag cement activity index based on tests of single batches made by different laboratories should not differ by more than 16.1 percent. 10.2. Slag Cement DensityDetermine in accordance with T 133. 10.3. Amount of Slag Cement Retained on a 45-m (No. 325) SieveDetermine in accordance with T

45、 192. 10.4. Slag Cement Fineness by Air PermeabilityDetermine in accordance with T 153. 10.5. Sulfate Ion in Slag Cement Reported as SO3Determine as sulfur trioxide in accordance with T 105, except the sample need not be completely decomposed by acid. 10.6. Sulfide Sulfur in the SlagDetermine in acc

46、ordance with T 105. 10.7. Chloride Content of SlagDetermine in accordance with T 105. 10.8. Air Content of Slag Cement MortarDetermine in accordance with T 137, except use 350 g of slag cement in the standard mortar batch. Calculate using the appropriate density of the slag. 11. REJECTION AND REHEAR

47、ING 11.1. The purchaser has the right to reject material that fails to conform to the requirements of this specification. Rejection shall be reported to the producer or supplier promptly and in writing. In case of dissatisfaction with the results of the tests, the producer or supplier is not prohibi

48、ted from making a claim for retesting. Note 8In the event of a Slag Cement Activity Index dispute, the purchaser should request a sample of the producers reference cement for retest. 12. CERTIFICATION 12.1. Upon request of the purchaser in the contract or order, a manufacturers report shall be furni

49、shed at the time of shipment stating the results of tests made on samples of the material taken during production or transfer and certifying that applicable requirements of this specification have been met. When specified in the purchase order or contract, the purchaser shall be furnished certification that samples representing each lot have been tested as directed in this 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of app