Mortar

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Active ASTM Standards for Mortar

C270 Standard Specification for Mortar for Unit Masonry

C1329 Standard Specification for Mortar Cement

C1384 Standard Specification for Admixtures for Masonry Mortars


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Article	Description
Introduction	An overview of the characteristics of mortar
Wet Characteristics	Workability
	Retentivity and flow
Dry Characteristics	Compressive Strength
	Bond Strength
Replacing Historic Mortar	reproducing similar products for restoration and repair of existing masonry, and identify the fundamental parameters and standardized testing methods for the old mortars.
Understanding Mortar: Masonry Materials	It is critical to appreciate mortar's properties and how the ingredients in mortar affect performance. Three important properties of mortar are workability, bond, and compressive strength.
A Case for Hydraulic Mortar: Masonry Materials	Like everything old, hydraulic mortars are new again, finding a place in historic restorations
Grinders for Removing Mortar	Small disc grinders are indispensable for repair contractors who do a lot of masonry repointing. These electric-powered right angle grinders allow hardened mortar to be cut out quickly and efficiently
Pointing with Poise	Getting mortar into a thin joint between already-placed units can be a difficult, messy and expensive operation. Some innovative companies, however, have developed equipment that eliminates much of the agony.
Selecting Mortar for Historic Preservation Projects	The article provides guidelines for determining the composition of a structure's existing mortar and advocates using a lime-based mortar for repointing if a lime mortar was used originally
Surface Grouting to Repair Mortar Joints	When joints are weathered but not badly deteriorated, surface grouting can stop leaks more economically than repointing. Try Surface Grouting


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Article

Description

BOND STRENGTH and WATER PENETRATION of LOW IRA BRICK and MORTAR

Brick with initial rate of absorption (IRA) less than 5gm/min/30 in2 can be used successfully when laid in mortar having low water retention. In this research program, brick with IRA near 1 gm/min/30 in2 and 4 gm/min/30 in2 were combined with seven different mortars. Mortar materials were portland cement/lime, mortar cement and masonry cement. A control was established by combining a brick with a mid-range IRA, 15 gm/min/30 in2, and portland cement/lime mortars. Flexural bond strengths were evaluated using the bond wrench. The combinations of materials which resulted in the highest and lowest bond strengths for each of the cementitious materials types were tested for water penetration resistance. This paper presents the parameters of the program, material properties, results, and conclusions.


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