Flexural strength of fiber reinforced lime mortars for historic masonry structures

Abstract eng:
The first author of the project is the engineering director of a Temple reconstruction project in Turkey. In attempt to produce mortar similar in composition to that found at the temple site and employ the use of fibers for mortars increased durability and resistance against in-plane loading, the team prepared an extensive experimental program. This program was carried out for the United States National Park Service (NPS), National Center of Preservation Technology and Training (NCPTT). The materials used in this experimental program are two types of masonry units (fired-clay bricks and concrete masonry units), three types of binder matrices (Portland cement-lime, type N; natural hydrated lime 3.5W, and natural hydrated lime 4W), and 8 types of fibers (5 synthetic versions, goat hair, horse hair, and specially treated corn silk fibers). With the variations in matrix preparations and the fiber volume fractions, 80 mixtures are tested for workability, water permeability, compressive strength of mortar and prisms, flexural strength of mortar, bond strength, and shear strength. In this paper only the flexural strength of mortar for 12 of these mixtures are discussed. These selected mortars were chosen because of their composition similarities to the authentic mortar from the temple. This paper assesses the effect of fibers in lime based mortar and provides suggestions on how to determine which mortar most feasible for certain scenarios.

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