![]() Note that concrete cylinders are usually tested 28 days after casting as a quality-control check to determine if compressive strength levels are acceptable. ![]() ![]() Generally the higher the psi rating, or the weight under which a square inch of concrete surface area will fail, the stronger and more durable the concrete will be. These tests are conducted on cylindrical concrete specimens (per ASTM C39) using a machine that compresses the cylinders until they crack or break completely (see Concrete Testing Procedures). Testing is the only way to determine whether a concrete mix has enough compressive strength, or load-bearing capacity, for the intended use. How do you test the compressive strength of concrete? Understanding what the different psi ratings mean is essential for specifying the right type of concrete for your project. It is a reliable indicator of how it will perform under heavy loads or internal pressures caused by freeze-thaw cycles. The compressive strength of concrete refers to how many pounds per square inch (psi) it can handle when force is applied. (2005) “Compressive Testing and Analysis of a Typical Straw Wall Plaster”, in Proceedings of Engineering Sustainability 2005 Conference, Pittsburgh, USA.Concrete is known to be strong and long-lasting, but just how strong it needs to be to do its job varies, depending on the application. Ontario Straw Bale Building Coalition-OSBBC (2004) “Straw Bale Building: An Information Package for Building Officials in Ontario”, OSBBC, Spencerville, Ontario. (2003) “Structural Testing of Plasters for StrawBale Construction”, Ecological Building Network, accessed September 14, 2005. (2003) “In-Plane Cyclic Test of Plastered Straw Bale Wall Assemblies, Ecobuild Network”, accessed September 14, 2005.ĪSTM C 109 (1998) “Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in of 50-mm Cube Specimens)”, Annual Book of ASTM Standards, Section 4-Construction, Volume 04.01-Cement lime Gypsum, West Conshohocken, PA.ĪSTM C 469 (2002) “Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compression”, Annual Book of ASTM Standards, Section 4-Construction, Volume 04.02-Concrete and Aggregates, West Conshohocken, PA.ĪSTM D 422 (2002) “Standard Test Method for Particle-Size Analysis of Soils”, Annual Book of ASTMStandards, Section 4-Construction, Volume 04.08-Soil and Rock, West Conshohocken, PA.ĪSTM C 39 (2004) “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens”, Annual Book of ASTM Standards, Section 4-Construction, Volume 04.02-Concrete and Aggregates, West Conshohocken, PA. ![]() This process is experimental and the keywords may be updated as the learning algorithm improves.Īsh, C., Aschheim, M. These keywords were added by machine and not by the authors. Plaster made with soil was found to have greater strength than the plaster made with bagged clay or lime-cement plaster. As moisture content at the time of testing increased, both the strength and the stiffness decreased proportionally. As clay content increased, strength increased proportionally and stiffness was unaffected. As the drying time increased between 10 days and 18 days, strength was unaffected but modulus of elasticity increased proportionally. It was found that as initial moisture content increased, strength and modulus of elasticity was unaffected for the earthen plaster. Compressive testing was conducted on 50-mm plaster cubes and 100-mm by 200-mm plaster cylinders. Clayey silt soil, bagged ball clay and lime-cement are compared as plaster binders for straw-bale applications. This study investigated the importance of initial plaster moisture content, drying time, clay content and, moisture content at the time of testing. ![]() A better understanding of the parameters affecting earthen plaster strength is essential for safe and effective use of this building technique. Straw-bale construction is an emerging building method and many builders choose to plaster the straw bales with earthen plaster to reduce the embodied energy of the structure. ![]()
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