Investigation of the effect of selected polypropylene fibres and ultra-fine aggregate on plastic shrinkage cracks on South African roads

Kluyts, Grant

Title: Investigation of the effect of selected polypropylene fibres and ultra-fine aggregate on plastic shrinkage cracks on South African roads
Creator: Kluyts, Grant
Subject: Concrete roads -- South Africa -- Design and construction
Subject: Fiber-reinforced concrete
Subject: Reinforced concrete -- Cracking
Subject: Concrete -- Expansion and contraction
Subject: Polypropylene fibers
Date Issued: 2005
Date: 2005
Type: Thesis
Type: Masters
Type: MTech
Identifier: vital:9592
Identifier: http://hdl.handle.net/10948/174
Identifier: Concrete roads -- South Africa -- Design and construction
Identifier: Fiber-reinforced concrete
Identifier: Reinforced concrete -- Cracking
Identifier: Concrete -- Expansion and contraction
Identifier: Polypropylene fibers
Description: Plastic shrinkage cracks, although not inherently structurally debilitating, expose the reinforcement in low-volume reinforced concrete roads to deleterious substances, which may reduce its effectiveness leading ultimately to structural failure. In un-reinforced low-volume concrete road these cracks appear unsightly and cause the road user an unpleasant riding experience. Many researchers believe that plastic shrinkage crack development remains a concern to the concrete industry, occurring in particularly large–area pours such as low-volume concrete roads, and therefore requires further research to understand their formation and minimization. This study reports findings on the effectiveness of oxyfluorinated polypropylene fibres to control plastic shrinkage cracks, and the effect the addition of ultra-fine material has on the formation and/or propagation of these cracks. Findings indicate that low volume dosages (2 kg/m³), of oxyfluorinated polypropylene fibre significantly reduced the formation of plastic shrinkage cracks under test conditions. Furthermore, that the addition of ultra-fine material in excess of 63 kg/m³ increased the formation and/or development of plastic shrinkage cracks.
Format: xiv, 178 leaves
Format: pdf
Publisher: Nelson Mandela Metropolitan University
Publisher: Faculty of Engineering, the Built Environment and Information Technology
Language: English
Rights: Nelson Mandela Metropolitan University

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