AASHTO M 302-2018 Standard Specification for Slag Cement for Use in Concrete and Mortars.pdf

1、Standard Specification for Slag Cement for Use in Concrete and Mortars AASHTO Designation: M 302-18 Technical Section: 3b, Fresh Concrete Release: Group 1 (April) ASTM Designation: C989/C989M-17 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 2

2、49 Washington, D.C. 20001 TS-3b M 302-1 AASHTO Standard Specification for Slag Cement for Use in Concrete and Mortars AASHTO Designation: M 302-18 Technical Section: 3b, Fresh Concrete Release: Group 1 (April) ASTM Designation: C989/C989M-17 1. SCOPE 1.1. This specification covers slag cement for us

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

4、ndard 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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.4. The text of this stan

5、dard references notes that provide explanatory information. These notes and footnotes (excluding those in tables) shall not be considered 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

6、 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 special grouts and mortars and, when used with an appropriate activator, as the principal cementitious material in some applications. Note 2Information on technic

7、al aspects of the use of the material described in this specification is contained in Appendix A. More detailed information on that subject is contained in ACI 233R-03, formerly ACI 226.1R. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 85, Portland Cement M 240M/M 240, Blended Hydraulic Cement R

8、80, Determining the Reactivity of Concrete Aggregates and Selecting Appropriate Measures for Preventing Deleterious Expansion in New Concrete Construction T 105, Chemical Analysis of Hydraulic Cement T 106M/T 106, Compressive Strength of Hydraulic Cement Mortar (Using 50-mm or 2-in. Cube Specimens)

9、T 133, Density of Hydraulic Cement T 137, Air Content of Hydraulic Cement Mortar T 153, Fineness of Hydraulic Cement by Air Permeability Apparatus 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-3b M

10、 302-2 AASHTO 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 C452/C452M, Standard Test Method for Potential Expansion of Portland-Cement Mortars Exposed to Sulfate C465, Standard Specificati

11、on for Processing Additions 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

12、Practice for Random 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 prod

13、uct, consisting essentially 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

14、 material formed when 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

15、 to cement fineness 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

16、specify the grade slag desired and the optional chemical or physical data to be reported. 6. ADDITIONS 6.1. The slag cement covered by this specification shall contain no additions except as follows: 2018 by the American Association of State Highway and Transportation Officials. All rights reserved.

17、 Duplication is a violation of applicable law.TS-3b M 302-3 AASHTO 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

18、 percent of the mass 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

19、.1.2. Processing additions 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.

20、1. Slag cement shall 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 re

21、quired Air content of 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 an

22、d reported for informational purposes. bOnly applicable when testing at 56 days is specified. 8. CHEMICAL COMPOSITION 8.1. Slag cement shall conform to the chemical requirements prescribed in Table 2. Table 2Chemical Requirements Sulfide sulfur (S), max percent 2.5 Note 3Sulfur in slag cement is pre

23、sent predominantly as sulfide sulfur. In most cases, instrumental analyses, such as x-ray fluorescence, cannot differentiate sulfide sulfur from sulfate. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.

24、TS-3b M 302-4 AASHTO Determine 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 eith

25、er from a delivery unit 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). Sam

26、ple by removing approximately 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

27、 tons) of shipments, whichever 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 deliver

28、y unit or time of day 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-

29、Activity Tests with Portland 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 6Appendi

30、x X1 discusses the effects 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

31、 the additional requirements 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 r

32、equalified at intervals 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.2Table 3Alkali and Strength Limits of Reference Cement for Slag Ce

33、ment Activity Tests Total alkali (Na2O + 0.658 K2O) min percent max percent 0.60 0.90 Compressive strength, MPa, min 28 daysa35 (5000 psi) a The minimum 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-contro

34、lled M 302 mortar cubes. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-3b M 302-5 AASHTO 10.1.3. Preparation of SpecimensPrepare mortars in accordance with T 106M/T 106, except that sufficient wate

35、r shall be used in each batch to produce mortar at a flow of 105 percent to 115 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 sta

36、ndard sand 10.1.3.1. Mix a reference cement 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 s

37、hipped. 10.1.4. Test AgesDetermine the compressive 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 = (S

38、P/P) 100 (1) where: SP = average compressive strength 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 activi

39、ty index shall, when a reference cement mortar 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.

40、6.1. Slag cement activity index, percent; 10.1.6.2. 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; 10.1.6.4. Total alkalies of the reference cement (Na2O + 0.658 K2O); 10.1.6.5. Fineness of reference c

41、ement; and 10.1.6.6. Potential compound composition of the reference portland cement. 10.1.7. PrecisionThe single and multilaboratory statements are based on slag activity index tests using one slag cement, in duplicate, at 7 and 28 days after fabrication of specimens. The same slag cement and CCRL

42、reference cement were used at each of 22 laboratories. Note 8The precision of this test method was determined from an interlaboratory study conducted in 2015. For further details on the interlaboratory study refer to ASTM C989/C989M. 2018 by the American Association of State Highway and Transportati

43、on Officials. All rights reserved. Duplication is a violation of applicable law.TS-3b M 302-6 AASHTO 10.1.7.1. The single-laboratory standard deviation has been found to be 1.65 percent at 7 days and 2.62 percent at 28 days. Therefore, the slag activity indices of properly conducted tests based on s

44、ingle batches of mortar mixed on the same day would not be expected to differ by more than 4.6 percent at 7 days and 7.3 percent at 28 days in more than one case in 20. 10.1.7.2. The multilaboratory standard deviation has been found to be 6.88 percent at 7 days and 4.78 percent at 28 days. Therefore

45、, the slag activity indices of properly conducted tests of single batches by different laboratories would not be expected to differ by more than 19.3 percent at 7 days and 13.4 percent at 28 days in more than one case in 20. 10.2. Slag Cement DensityDetermine in accordance with T 133. 10.3. Amount o

46、f Slag Cement Retained on a 45-m (No. 325) SieveDetermine in accordance with T 192. 10.4. Slag Cement Fineness by Air PermeabilityDetermine in accordance with T 153. Note 9In T 153, the applicable b is 0.9. 10.5. Sulfate Ion in Slag Cement Reported as SO3Determine as sulfur trioxide in accordance wi

47、th T 105, except the sample need not be completely decomposed by acid. 10.6. Sulfide Sulfur in the SlagDetermine in accordance 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

48、slag cement in the standard mortar batch. Calculate using the appropriate density of the slag. 11. REJECTION AND REHEARING 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 pro

49、mptly and in writing. In case of dissatisfaction with the results of the tests, the producer or supplier is not prohibited from making a claim for retesting. Note 10In 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 furnished at the time of shipment stating the results of tests made on samples of the material tak