3D printing Aerodynamic engineering Aeronautical engineering Aeronautical engineering books Airports Architecture Artificial intelligence Automobiles Blast Resistant Design Books Bridges Building Codes Cabin Systems Civil Engineering Codes Concrete Conferences Construction Management Construction Materials Cooling Cryptocurrency Dams Do it Yourself Docks and Harbours Downloads Earthquake Engineering Electronics Engineering Engines Environmental Design & Construction Environmental Engineering Estimation Fluid Mechanics Fluid Mechanics Books Formwork design foundation engineering General Geotech Books Geotechnical Engineering Global Positioning System HVAC Hydraulics Hydraulics Books Hydro Power Hydrology Irrigation Engineering Machinery Magazines Management Books Masonry Mechanical Engineering Mechanics Mechanics Books Miscellaneous Books Modern Steel Construction Nanotechnology Natural Hazards Network Security Engineer Networking Systems News Noise and Attenuation Nuclear Engineering Nuclear Hazards to Buildings Pavement Design Prestressed Concrete Project Management Project Management Books Quantity Survey Quantity Survey Books railways RCC Structural Designing Remote Sensing Remote Sensing and GIS Books Renewable Energy Reports Resume Roads scholarships Smart devices Software Software Engineering Soil Mechanics Solar Energy Special Concrete Spreadsheets Steel Steel Spreadsheets Structural Analyses structures Structures Books Surveying Surveying Books Testing Thermodynamics Thesis Transportation Books Transportation Engineering Tunnel Engineering Wind Energy Zero Energy Buildings

Research Project: The Effect of Test Cylinder Size on the Compressive Strength of Sulfur Capped Concrete Specimens

The new trend of using high-strength concrete in construction has caused a need for the use of 4 x 8 in. cylinders for assurance testing. A controlling factor that affects the size of specimen that can be tested in a compression machine is the strength of the concrete on evaluation. Some testing machines are not able to produce the force needed to break high-strength 6 x 12 in. concrete cylinders. If 4 x 8 in. cylinders are to be used in quality assurance testing, the relationship between fc4 and fc6 needs to be understood in order to ensure that concrete with sufficient strength is provided. If the average compression machine operates safely, rarely exceeding 80% of its capacity, and has a capacity of 250,000 lbs, the machine can test a 6 x 12 in. cylinder with a compressive strength of approximately 7,000 psi. The same machine can test a 4 x 8 in. cylinder of approximately 16,000 psi.

Research Project: The Effect of Test Cylinder Size on the Compressive Strength of Sulfur Capped Concrete Specimens
A 4 x 8 in. cylinder weighs about 9 lb compared to a 6 x 12 in. cylinder, which weighs about 30 lb. This might suggest that because 4 x 8 in. cylinders are lighter and can easily be handled, collection of quality control and assurance specimens would be easier for contractors and inspectors. The advantages of using smaller specimens are: 1) easier handling; b) less required storage space; c) less capacity required of testing machines.

This research project was born from the need to determine a correlation between the strength of the standard size 6 x 12 in. cylindrical specimen and the strength of a 4 x 8 in. cylindrical specimen made from the same batch of concrete. The objectives of this study are to review the factors that may affect the compressive strength, those that may affect the strength obtained by 4 x 8 in. and 6 x 12 in. cylinders, and the variability associated with these tests. An extensive laboratory testing program was developed to evaluate the desired goals of the project. A total of 359 4 x 8 in. and 357 6 x 12 in. cylinders were tested.

The factors that were studied to evaluate the effect of cylinder size on concrete compressive strength were aggregate size, technician, compressive strength, and age of specimen at testing. It was determined that compressive strength was the only factor significant in affecting the ratio of 4 x 8 in. cylinder strength to 6 x 12 in. cylinder strength. Compressive strength was also the only factor significant in affecting the within-test variability of each batch of concrete. It is recommended that 4 x 8 in. cylinders may be implemented for quality assurance testing if the design strength of concrete is greater than 5,000 psi and the capacity of the testing machine will not allow the testing of 6 x 12 in. cylinders based on the design strength. However, if 4 x 8 in. cylinders are used, a correlation between the 4 x 8 in. and 6 x 12 in. cylinders should be determined using a capable machine for the project.

Author Name


Contact Form


Email *

Message *

Powered by Blogger.