Abstract
The polypropylene (PP) fibers in shotcrete has been used for ground support and building strengthening, since several decades. However, the recent trend is to use the waste material in cementbased mixes to produce an eco-friendly material. Such waste material is the incineration fly ash (FA) that is classified as a hazardous product. This study is intended to establish the mechanical properties of fiber reinforced mortar in addition to cement or sand partial replacement by fly ash, in terms of flexural strength testing. The mechanical properties reflect the influence of the dosage of fiber content and the proportion of the fly ash on the flexural strength. The percentage of cement or sand was replaced by 0, 10, 20, and 30% fly ash. The dosage of fibers was 0, 0.6, 1.2, and 1.8 kg/m3. This green mix with fibers provides a partial substitute of cement as it is cheaper, by incorporating waste product, and saving energy consumption in the production. Due to growing interest in sustainable construction, engineers and architects are motivated to choose such materials which are more sustainable.
Highlights
Fibre reinforced shotcrete has been successfully used in different civil engineering applications
4.4 Combined effect of PP fibers and cement replacement with fly ash on flexural strength The combined effect of PP fibers and FA-C content on the flexural Strength of prism specimens at 7 and 28 days are illustrated in figure 7
For 10% FA-C, the PP fibers present a negative effect on the flexural strength of mortar, and for 20% and 30% FA-C, the flexural strength increased with the fiber content
Summary
Fibre reinforced shotcrete has been successfully used in different civil engineering applications. Concrete and cementitious materials are vulnerable to tensile crack developing in structural element. Reinforcing materials with fibers are commonly used to control tensile cracks. The advantage of fibers in mortar is characterized by the ductile behaviour, namely better post-cracking strength and energy absorption that is referred to as “toughness”. The use of fibers provides resistance to plastic, drying shrinkage, and controls crack width at a dosage as low as 0.25% [1], and fibers delay crack formation and reduce crack widths and total cracking areas. The recent trend is to reduce CO2 emission and to recycle waste material such as waste to energy fly ash. One example of fly ash, which is composed of black particles, is retained on chimneys filters and generated by the combustion of paper, nylon, and plastics. The present research aims to find the optimum replacement percentage and satisfactory mechanical properties
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