New Spec for Mortar Omaha NE

The new ASTM C 1142, Standard Specification for Ready-Mixed Mortar for Unit Masonry, finally gives architects and contractors the assurance that this space-age masonry material meets minimum requirements. Among its many benefits, ready mixed mortar provides uniform quality.

Stetson Building Products Inc
(402) 331-0333
6820 J St
Omaha, NE
 
Midwest Construction Products
(402) 392-7383
3030 Keystone Dr
Omaha, NE
 
Bradco Supply
(402) 731-0588
7700 F St
Omaha, NE
 
Stetson Building Products
(402) 331-0306
6820 J St
Omaha, NE
 
Armor Industries Inc
(402) 571-5458
9215 Fremont St
Omaha, NE
 
Builders Supply Co Inc
(402) 331-4500
5701 S 72nd St
Omaha, NE
 
Arctic Insulation Inc
(402) 457-5064
8615 N 29th St
Omaha, NE
 
Proven Products
(402) 827-3880
5010 I St
Omaha, NE
 
84 Lumber
(402) 758-0084
15001 W Center Rd
Omaha, NE
 
Midstates Construction Products Inc
(402) 331-4548
4103 S 67th St
Omaha, NE
 

New Spec for Mortar

Provided By:

Source: Masonry Construction
Publication date: June 1, 1990

By Mark A. Wallace

The new ASTM C 1142, Standard Specification for Ready-Mixed Mortar for Unit Masonry, finally gives architects and contractors the assurance that this space-age masonry material meets minimum requirements. Among its many benefits, ready mixed mortar provides uniform quality. Each tub is batched and mixed the same way at a plant or in a batcher-mixer truck on the jobsite. Ready mixed mortar also eliminates the cost of mixers, backup mixers, and the mixer operator.

FOUR MORTAR TYPESThe new standard sets minimum property requirements for four types of ready mixed mortar: RM, RS, RN, and RO. Four cement combinations can be used: portland cement only; portland cement and lime; masonry cement only; or masonry cement and portland cement.

FIELD MORTAR MUST MEET SPECS TOOUnlike C 270, C 1142 is a property specification only. C 1142 differs from C 270 in another important way. In C 270, only the mortar made in the lab must meet those specifications. In C 1142, both the laboratory and the field mortar must be tested and conform to the specifications.

TESTING THE MORTARC 1142 details how tests should be performed. Determine the consistency by the cone penetration method. Measure air content by the pressure or volumetric method. Evaluate water retentivity by ASTM C 91. Measure compressive strength following Section A6 of ASTM C 780.

The full text of this article is available as a PDF document.

Click here to read full article from Masonry Construction