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The use of an extended plastic life mortar which can be stored for a prolonged period of time without losing its desirable properties can be beneficial to the masonry industry in several ways.
This paper presents the findings of a two-phase study related to an extended plastic life mortar (ready mix mortar) using a single brand of set-reducing additive. Phase 1 was optimization of a final mix in terms of setting characteristics and compressive strength. Mixes were made which examined the variables of dosage rates, cement content, lime content, and fly ash content. Each mix was characterized by compressive strength, air content, water retention, and plasticity. Several mix designs were generated for achieving particular strength and setting characteristics.
Phase 2 compared one of the generated extended plastic life mortars to a standard portland cement lime Type N mortar as defined in ASTM Specification for Mortar for Unit Masonry (C 270) with respect to mechanical properties. The properties examined included: compressive strength, bond strength, freeze thaw, corrosion, shrinkage, efflorescence, and compressive strength and modulus of elasticity of masonry prisms.
mortar, ready mixed, retarded strength, freeze-thaw resistance, corrosion, shrinkage, efflorescence
Professor, University of Texas at Arlington, Arlington, TX
Consulting engineer, Constructive Engineering, Mesquite, TX
Student, University of Texas at Arlington, Arlington, TX