C 1012

Designation: C 1012 – 95a

Standard Test Method for

Length Change of Hydraulic-Cement Mortars Exposed to a Sulfate Solution1
This standard is issued under the fixed designation C 1012; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope 1.1 This test method covers the determination of length change of mortar bars immersed in a sulfate solution. Mortar bars made using mortar described in Test Method C 109/ C 109M are cured until they attain a compressive strength of 20.0 6 1.0 MPa (3000 6 150 psi), as measured using cubes madeof the same mortar, before the bars are immersed. 1.2 The values stated in SI units are to be regarded as the standard. The values shown in parentheses are for information purposes only. 1.3 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 this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limitations prior to use. 2. Referenced Documents 2.1 ASTM Standards: C 109/C 109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 50-mm (2-in.) Cube Specimens)2 C 150 Specification for Portland Cement3 C 157 Test Method for Length Change of Hardened Hydraulic-Cement Mortar and Concrete3 C 215 Test Method for FundamentalTransverse, Longitudinal, and Torsional Frequencies of Concrete Specimens3 C 305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency2 C 348 Test Method for Flexural Strength of Hydraulic Cement Mortars2 C 349 Test Method for Compressive Strength of Hydraulic Cement Mortars (Using Portions of Prisms Broken in Flexure)2 C 452 Test Method for Potential Expansion ofPortland Cement Mortars Exposed to Sulfate2 C 490 Practice for Use of Apparatus for the Determination of Length Change of Hardened Cement Paste, Mortar, and Concrete2
1 This test method is under the jurisdiction of ASTM Committee C-1 on Cement and is the direct responsibility of Subcommittee C01.29 on Sulfate Resistance. Current edition approved Oct. 10, 1995. Published December 1995. Originallypublished as C 1012 – 1984. Last previous edition C 1012 – 95. 2 Annual Book of ASTM Standards, Vol 04.01. 3 Annual Book of ASTM Standards, Vol 04.02.

C 595 Specification for Blended Hydraulic Cements2 C 597 Test Method for Pulse Velocity Through Concrete3 C 618 Specification for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete3 C 684 TestMethod for Making, Accelerated Curing, and Testing of Concrete Compression Test Specimens3 C 778 Specification for Standard Sand2 C 917 Test Method for Evaluation of Cement Strength Uniformity from a Single Source2 C 989 Specification for Ground Iron Blast-Furnace Slag for Use in Concrete and Mortars3 D 1193 Specification for Reagent Water4 E 18 Test Methods for Rockwell Hardness and RockwellSuperficial Hardness of Metallic Materials5 3. Significance and Use 3.1 This test method provides a means of assessing the sulfate resistance of concretes and mortars made using portland cement, blends of portland cement with pozzolans or slags, and blended hydraulic cements. Method C 452 is suitable for evaluating portland cements but not blended cements or blends of portland cement with pozzolans or slags.3.2 The standard exposure solution used in this test method, unless otherwise directed, contains 352 moles of Na2SO4 per m3(50 g/L). Other sulfate concentrations or other sulfates such as MgSO4 may be used to simulate the environmental exposure of interest. Further discussion of these and other technical issues is given in the Appendix. 4. Apparatus 4.1 Mixer, conforming to the requirements of...