What are the different tests done on concrete?

Question

Hi. If you know any tests done on concrete or if you know any website about it kindly tell me cause this is my homework in Construction Materials & Testing subject. Can't google it. Thank you very much. God bless..:D

Answer 1

Here in Indiana we do the following:

Water/Cement ratio

Slump

Air Content

Yield

Beams for Flexural Strength

Cylinders for Compressive Strength

Answer 2

Wet concrete.

Slump cone test

Vee Bee test

Cured concrete

Cylinder or cube crushing test

Density measurement of cylinders/cubes

Ultrasonic testing of insitu concrete

Schmidt hammer test

Answer 3

Engineers usually specify the required compressive strength of concrete, which is normally given as the 28 day compressive strength in megapascals (MPa) or pounds per square inch (psi). Twenty eight days is a long wait to determine if desired strengths are going to be obtained, so three-day and seven-day strengths can be useful to predict the ultimate 28-day compressive strength of the concrete. A 25% strength gain between 7 and 28 days is often observed with 100% OPC (ordinary Portland cement) mixtures, and up to 40% strength gain can be realized with the inclusion of pozzolans and supplementary cementitious materials (SCMs) such as fly ash and/or slag cement. As strength gain depends on the type of mixture, its constituents, the use of standard curing, proper testing and care of cylinders in transport, etc. it becomes imperative to proactively rely on testing the fundamental properties of concrete in its fresh, plastic state.

Concrete is typically sampled while being placed, with testing protocols requiring that test samples be cured under laboratory conditions (standard cured). Additional samples may be field cured (non-standard) for the purpose of early 'stripping' strengths, that is, form removal, evaluation of curing, etc. but the standard cured cylinders comprise acceptance criteria. Concrete tests can measure the "plastic" (unhydrated) properties of concrete prior to, and during placement. As these properties affect the hardened compressive strength and durability of concrete (resistance to freeze-thaw), the properties of slump (workability), temperature, density and age are monitored to ensure the production and placement of 'quality' concrete. Tests are performed per ASTM International or CSA (Canadian Standards Association) and European methods and practices. Technicians performing concrete tests MUST be certified. Structural design, material design and properties are often specified in accordance with ACI American Concrete Institute) code (www.concrete.org); with test methods, production and delivery under the "prescription" or "performance" purchasing options per ASTM C94 (www.astm.org).

Compressive-strength tests are conducted using an instrumented hydraulic ram to compress a cylindrical or cubic sample to failure. Tensile strength tests are conducted either by three-point bending of a prismatic beam specimen or by compression along the sides of a cylindrical specimen.