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Tolteca Masonry Cement

Type N

Product Description

Tolteca Masonry Cements are produced to meet the criteria of ASTM C91 “Standard Specification for Masonry Cements” for Types N, S, and M. (Table 1)

Tolteca Masonry Cement consists of a mixture of Portland cement, limestone, and chemical admixtures to provide plasticizing properties and other enhanced performance attributes. These components are proportioned at the cement plant under controlled conditions to assure product consistency.

Basic Use: Tolteca Masonry Cements are used to produce Types N, S, and M mortars as defined in ASTM C-270 “Standard Specification for Mortar for Unit Masonry.”

Tolteca Masonry Cements when mixed with the recommended volumes of sand meeting ASTM C-144”Standard Specification for Aggregate for Mortar for Unit Masonry” will produce a mortar that will comply with the requirements of ASTM C-270 for the Proportion Specification (Table 2) and the Property Specification (Table 3).

Availability: Tolteca Masonry Cements are available in one cubic foot sacks containing a plastic moisture barrier and in bulk via pressurized bulk containers.

Installation More

Mixing: Machine mixing should be used whenever possible. First, add most of the water and half of the sand. Next, add the masonry cement and the rest of the sand. After one minute of continuous mixing, slowly add the rest of the water. Mixing should continue for at least three minutes; extending mixing up to five minutes improves mortar qualities.

No admixtures should be used without the written approval of the architect or engineer of record. No additives are necessary, unless specified.

Water: All water should be clean and free from organic material and deleterious amounts of dissolved acids, alkalis and salts.

Retempering: To minimize retempering, mortar should not be mixed more than 15 minutes prior to use. Retempering will not adversely affect mortar quality if only evaporated water is replaced. Colored mortar should not be retempered.

Tooling of joints: Tooling of mortar joints increases the density, durability and water tightness of the mortar surface. The moisture content of the mortar when tooled will affect the color; the drier the mortar, the darker its final color.

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Specifications More

Table 1. ASTM C91 Masonry Cement

Physical Requirements of Masonry Cements
Masonry Cement Type Compressive Strength Min., psi (MPa) Water Retention Minimum % Air Maximum %
N 900 (6.2) 70 21
M 2900 (20.0) 70 19
S 2100 (14.5) 70 19

Table 2. Proportion Specification (Parts by Volume)

  Cement Type Fine Aggregate
Mortar Type Masonry Cement Type N Masonry Cement Type S Masonry Cement Type M Masonry Sand
N 1 - - 2 ¼ - 3
S - 1 - 2 ¼ - 3
M - - 1 2 ¼ - 3

Table 3. Property Specification

Mortar Type Compressive Strength Min., psi (MPa) Water Retention Minimum % Air Maximum %
N 750 (5.2) 75 20
S 1800 (12.4) 75 18
M 2500 (17.2) 75 18

*Estimation based on a sand volume of 1 cubic foot of damp loose sand. No allowance made for waste.

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Mortar Coverage Estimation More

Mortar Coverage Estimation Sheet

Type S
Unit Pieces per One Bag of Masonry
8x8x16 CMU 33 - 35
12x8x16 CMU 25 - 28


Type N
Unit Pieces per One Bag of Masonry
Modular Brick 125 - 133
Queen Brick 85 - 90
Utility Brick 77 - 81

*All estimates are approximate.

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Building Materials Calculator More
Bags needed for brick count
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6" 8" 12"
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