عنوان

Creation of Cracks of Known Sizes in Reinforced Concrete Beams and Performance Evaluation of Silane in Concrete Bridge Decks

Number

TLpq2437435696

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Creation of Cracks of Known Sizes in Reinforced Concrete Beams and Performance Evaluation of Silane in Concrete Bridge Decks

General Material Designation

[Thesis]

First Statement of Responsibility

Aqib, Syed Muhammad

Subsequent Statement of Responsibility

Delatte, Norbert J.

Name of Publisher, Distributor, etc.

Oklahoma State University

Date of Publication, Distribution, etc.

2020

Specific Material Designation and Extent of Item

51

Dissertation or thesis details and type of degree

M.S.

Body granting the degree

Oklahoma State University

Text preceding or following the note

2020

Text of Note

Cracks are a major concern for the durability of concrete as they allow the harmful chemicals from outside to penetrate the concrete surface. Investigating the effect of various crack sizes is vital to further evaluate the surface treatments' performance. In this research, a novel technique is developed to create cracks of known size consistently in reinforced concrete beams using a very simple methodology which applies direct tensile load that cracks the beam. A variety of crack sizes is created ranging from very small (<1/100 inch [0.25 mm]) up to ½ inch [12.7 mm] and based on the results, a simple process is outlined which can be used to create predetermined crack sizes consistently. Silane is investigated as a surface treatment material, using Transmission X-ray Microscopy (TXM) and Optical Staining Techniques. The TXM results revealed that samples with silane coatings exhibited eight and half times less penetration of outside chemicals as compared to non-silane samples at a depth of 2 mm. In some samples, defects on the surface of the silane coating such as cracks, caused the coating to lose its efficiency. Quantitative measurements made using optical staining techniques show that silane thickness for all the 14 samples was 2.5 mm. This work shows in field applications that silanes are a useful and practical tool to significantly reduce the permeability of concrete.

Civil engineering

Aqib, Syed Muhammad

Delatte, Norbert J.

Electronic name

p

[Thesis]

276903

a

Y