EXPERIMENTAL PROCEDURE

BACKGROUND:

Concrete testing is conducted to evaluate laboratory mixtures of concrete mix design, quality control for in place concrete, and determining when construction forms may be removed.

PROCEDURE:

Remove the concrete cylinders from the curing room and keep in a moist condition until test. Do not remove the concrete beams from the curing room until ready to perform their respective tests.

A. Compressive Strength and Modulus Of Elasticity Of Cylindrical Concrete
Specimens
Capping Cylindrical Concrete Specimens A.S.T.M. C617-87.
Compressive Strength of Cylindrical Concrete Specimens A.S.T.M. C39-86.
Concrete Strength using the Schmidt Rebound Hammer, A.S.T.M. C805-85.

Static Modulus of Elasticity of Concrete in Compression A.S.T.M. C469-87a.

Figure 4.1 - Capped concrete cylinder specimen

Figure 4.2 - Compression specimen concrete cylinder loaded in the testing apparatus

Figure 4.3 - Schmidt Rebound Hammer, A.S.T.M. C805-85.

B. Flexural Strength of Concrete Beam with Third-Point Loading.
Flexural Strength of Concrete (using simple beam with third-point loading) A.S.T.M. C78-84.

Figure 4.4 - Flexural strength concrete specimen loaded in testing apparatus 4 Pt Bend Test

NOTE: By A.S.T.M. Standards, if the fracture occurred outside of the middle third of the span length by more than 5 percent of the span length, the results of the test are discarded. However, for purposes of this lab, the results and location of failure will be recorded and the proper equation from 8 will be utilized.

C. Splitting Tensile Strength of Cylindrical Concrete Specimens.
Splitting Tensile Strength of Cylindrical Concrete Specimens A.S.T.M. C469-87a.

Figure 4.5 - Splitting tensile strength concrete cylinder specimen loaded in testing apparatus