04 05 13 Masonry Mortaring.docx

10-01-17

SECTION 04 05 13

MASONRY MORTARING

GENERAL

SUMMARY

Section Includes:

Masonry mortar installed by concrete and masonry sections.

RELATED REQUIREMENTS

Mortar used in Section:

Section 03 45 00, PRECAST ARCHITECTURAL CONCRETE.

Section 04 01 00, MAINTENANCE OF MASONRY.

Section 04 05 16, MASONRY GROUTING.

Section 04 20 00, UNIT MASONRY.

Section 04 72 00, CAST STONE MASONRY.

APPLICABLE PUBLICATIONS

Comply with references to extent specified in this section.

ASTM International (ASTM):

C40/C40M‑11 - Organic Impurities in Fine Aggregates for Concrete.

C91/C91M‑12 - Masonry Cement.

C144‑11 ‑Aggregate for Masonry Mortar.

C150/C150M‑15 - Portland Cement.

C207‑06(2011) - Hydrated Lime for Masonry Purposes.

C270‑14a - Mortar of Unit Masonry.

C595/C595M‑15e1 - Blended Hydraulic Cements.

C780‑15 - Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry.

C979/C979M‑10 - Pigments for Integrally Colored Concrete.

C1329/C1329M‑15 - Mortar Cement.

SUBMITTALS

Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

Manufacturer's Literature and Data:

Description of each product.

Test Reports: Certify each product complies with specifications.

Mortar.

Admixtures.

Certificates: Certify each product complies with specifications.

Portland cement.

Masonry cement.

Mortar cement.

Hydrated lime.

Fine aggregate.

Qualifications: Substantiate qualifications comply with specifications.

Testing laboratory.

QUALITY ASSURANCE

Preconstruction Testing:

Engage independent testing laboratory to tests and submit reports.

Deliver samples to laboratory in number and quantity required for testing.

Test mortar and materials specified.

Mortar:

Test for compressive strength and water retention according to ASTM C270.

Minimum Mortar compressive strengths 28 days:

Type M: 17.2 MPa (2,500 psi).

Type S: 12.4 MPa (1,800 psi).

Type N: 5.1 MPa (750 psi).

Non Staining Cement: Test for water soluble alkali.

Water Soluble Alkali: Maximum 0.03 percent.

Sand: Test for deleterious substances, organic impurities, soundness and grading.

DELIVERY

Deliver products in manufacturer's original sealed packaging.

Mark packaging, legibly. Indicate manufacturer's name or brand, type, color, production run number, and manufacture date.

Before installation, return or dispose of products within distorted, damaged, or opened packaging.

STORAGE AND HANDLING

Store masonry materials under waterproof covers on planking clear of ground.

Protect loose, bulk materials from contamination.

Protect products from damage during handling and construction operations.

WARRANTY

Construction Warranty: FAR clause 52.246‑21, "Warranty of Construction."

PRODUCTS

MATERIALS

Hydrated Lime: ASTM C207, Type S.

Aggregate for Masonry Mortar: ASTM C144 and as follows:

Light colored sand for mortar for laying face brick.

White plastering sand meeting sieve analysis for mortar joints for pointing except that 100 percent passes No. 8 sieve, and maximum 5 percent retained on No. 16 sieve.

Test sand for color value according to ASTM C40/C40M. Sand producing color darker than specified standard is unacceptable.

Blended Hydraulic Cement: ASTM C595/C595M, Type IS, IP.

Masonry Cement: ASTM C91/C91M. Type N, S, Or M.

Use white masonry cement whenever white mortar is specified.

Mortar Cement: ASTM C1329/C1329M, Type N, S or M.

Portland Cement: ASTM C150/C150M, Type I.

Use white Portland cement wherever white mortar is specified.

Pigments: ASTM C979/C979M; inorganic, inert, mineral pigments only, unaffected by atmospheric conditions, nonfading, alkali resistant, and water insoluble.

Water: Potable, free of substances that are detrimental to mortar, masonry, and metal.

PRODUCTS - GENERAL

Provide each product from one manufacturer and from one production run.

MIXES

Pointing Mortar for New Work:

For Cast Stone or Precast Concrete: Proportion by volume; one part white Portland cement, two parts white sand, and 1/5 part hydrated lime.

Masonry Mortar: ASTM C270.

Admixtures:

Do not use mortar admixtures, and color admixtures unless approved by Contracting Officer's Representative.

Do not use antifreeze compounds.

Colored Mortar:

Maintain uniform mortar color for exposed work, throughout.

Match mortar color in approved sample or sample panel specified in Section 04 20 00, UNIT MASONRY.

EXECUTION

PREPARATION

Examine and verify substrate suitability for product installation.

Protect existing construction and completed work from damage.

MIXING

Measure ingredients by volume using known capacity container.

Mix for 3 to 5 minutes in a mechanically operated mortar mixer.

Mix water with dry ingredients in sufficient amount to provide a workable mixture which will adhere to vertical surfaces of masonry units.

Mortar Stiffened Because of Water Loss Through Evaporation:

Re‑temper by adding water to restore to proper consistency and workability.

Discard mortar reaching initial set or unused within two hours of mixing.

Pointing Mortar:

Mix dry ingredients with enough water to produce damp mixture of workable consistency retaining shape when formed into ball.

Allow mortar to stand in dampened condition for 60 to 90 minutes.

Add water to bring mortar to a workable consistency before use.

MORTARING

Type M Mortar: Use for precast concrete panels.

Type S Mortar: Use for masonry containing vertical reinforcing bars (non‑engineered) masonry below grade and setting cast stone and engineered reinforced unit masonry work.

Brick Veneer Over Frame Back Up Walls: Use Type S Portland cement‑lime mortar.

Type N Mortar: Use for other masonry work.

FIELD QUALITY CONTROL

Field Tests: Performed by testing laboratory specified in Section 01 45 29, TESTING LABORATORY SERVICES.

Take and test samples during progress of work according to ASTM C780.

END OF SECTION

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