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      MECHANICAL PERFORMANCE OF LIME-CEMENT MORTAR FOR STRAW-BALE CONSTRUCTION

      , P.Eng., Ph.D. 1 , , P.Eng., Ph.D., LEED GA 2

      Journal of Green Building

      College Publishing

      Straw-bale construction, mortar, cement, hydrated lime, compressive strength, constitutive model

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          Abstract

          Experimental data describing the mechanical performance of Portland cement-hydrated lime mortars used for straw bale construction is presented. Straw bale construction uses stacked straw bales plastered on each side to form load-bearing elements. Mortars used have slumps of approximately 50 mm, compared to slumps up to 279 mm for conventional masonry mortars. Cylinder and cube tests of a range of typical straw bale mortar mixes were carried out. The mortars had compressive strengths ranging between 0.3 MPa and 13 MPa. Empirical equations describing the relationships between compressive strength and curing time, w/cm ratio, proportions of lime, cement and sand, and modulus of elasticity are presented. The data show that cement-lime mortars for straw bale construction will have a higher modulus of elasticity and lower failure strain than a conventional mortar of equivalent compressive strength. The Modulus of Elasticity is on average 818 times the compressive strength of a straw bale mortar, compared to 100 to 200 times as reported in the literature for conventional mortar. The average failure strain for straw bale mortar is 0.00253 compared to 0.0087 to 0.0270 reported in the literature for conventional mortar.

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          Most cited references 20

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          “Racking shear resistance of prefabricated straw-bale panels”

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            “Concentric and Eccentric Compression Experiments of Plastered Straw Bale Assemblies”

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              “Mathematical Model for Complete Stress-Strain Curve Prediction of Normal, Light-Weight and High Strength Concretes”

               A.A. Tasnimi (2004)
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                Author and article information

                Journal
                jgrb
                College Publishing
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Summer 2014
                : 9
                : 3
                : 100-115
                Author notes

                1Associate Professor, Department of Civil Engineering, Queen's University, Kingston, Ontario, Canada, K7L3N6, 613-533-2469, colin@ 123456civil.queensu.ca .

                21228 Collins Ave., Ottawa, Ontario, Canada, K1V6E1, 613-983-2761, svardy@ 123456halsall.com .

                Article
                jgb.9.3.100
                10.3992/1943-4618-9.3.100
                ©2014 by College Publishing. All rights reserved.
                Page count
                Pages: 16
                Product
                Categories
                RESEARCH ARTICLES

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