The synergy between fiber reinforced concrete technologies and high volume pozzolanic material added self-consolidating concretes (SCC) may have motivating superior advantages that can be exploited by many concrete industries. The inclusion of fibers primarily for the improvements of mechanical properties of concrete such as weakness in tension, more brittle behavior and propagation of cracks. However, the casting of fiber reinforced concrete requires greater care of construction, more deliberate planning and workmanship than the normal concrete without fibers. Additionally for effective benefits of fibers on the concrete properties; the self-compactness of the concrete will play a great roll for better controlled fiber dispersion randomly throughout the concrete matrix. On the other hand, concrete construction industry is not a sustainable technology and an environmentally friendly process for many reasons. One of the main reason may be the principal key ingredient of concrete as binder is Portland cement and its production for clinker becomes a major contributor to the man-made CO2 greenhouse gas emissions in global warming and climate change. Therefore, in this study solid industrial by-products of fly ash and a ground residual rice husk ash from steam boiler were replaced the Portland cement by more than 50% as a binder for the fiber reinforced SCCs production. To investigate the effects of fibers on the properties of the rice husk ash added high volume fly ash SCC; two types of fibers, polypropylene (PP) and steel fibers (SF) with the inclusion dosage of each 0.4%, 0.8% and 1.2% by volume of concrete were used. And also a hybrid fiber (HF) which is a combine of PP and SF were used to identify the clear effect of fibers. Then the fiber reinforced SCCs were compared with two control self-consolidating concretes without fibers, the one with similar composition mixture of the fiber reinforced concrete and the other with fully Portland cement as binder.
The workability of the concretes was assessed for better fibers distribution control and orientation, and homogeneity of the concrete by slump flow test for filling ability, T50 and V-funnel testes for viscosity and J-ring test for passing ability. Even though the inclusion of both steel and polypropylene fibers were hinder the flow characteristics of SCC but by strictly following Densified Mixture Design Algorithm (DMDA) and with the help of high dosage of superplasticizer all mix proportions were controlled to slump flow range of 660 – 750 mm. The mechanical hardened properties of all concretes were carried out by compressive strength, splitting tensile strength, flexural strength, drying shrinkage, and dynamic modulus of elasticity and rigidity. Furthermore, the addition of fibers were asses the durability investigation by chloride-ion penetration, electrical surface resistivity, ultrasonic pulse velocity and sulfate attack. The hardened properties of all concretes with and without fiber addition founds that generally good durable performance. Moreover, the 91 days average compressive strength of the steel and polypropylene fiber reinforced SCCs were obtained within the range of 54 – 65MPa and 36 – 38MPa respectively. Whereas the two control concretes without fiber were obtained a 91 days average compressive strength of 41 and 46MPa for the concrete with the same composition matrix as the fiber reinforced concretes and the other with fully Portland cement as binder respectively.

The synergy between fiber reinforced concrete technologies and high volume pozzolanic material added self-consolidating concretes (SCC) may have motivating superior advantages that can be exploited by many concrete industries. The inclusion of fibers primarily for the improvements of mechanical properties of concrete such as weakness in tension, more brittle behavior and propagation of cracks. However, the casting of fiber reinforced concrete requires greater care of construction, more deliberate planning and workmanship than the normal concrete without fibers. Additionally for effective benefits of fibers on the concrete properties; the self-compactness of the concrete will play a great roll for better controlled fiber dispersion randomly throughout the concrete matrix. On the other hand, concrete construction industry is not a sustainable technology and an environmentally friendly process for many reasons. One of the main reason may be the principal key ingredient of concrete as binder is Portland cement and its production for clinker becomes a major contributor to the man-made CO2 greenhouse gas emissions in global warming and climate change. Therefore, in this study solid industrial by-products of fly ash and a ground residual rice husk ash from steam boiler were replaced the Portland cement by more than 50% as a binder for the fiber reinforced SCCs production. To investigate the effects of fibers on the properties of the rice husk ash added high volume fly ash SCC; two types of fibers, polypropylene (PP) and steel fibers (SF) with the inclusion dosage of each 0.4%, 0.8% and 1.2% by volume of concrete were used. And also a hybrid fiber (HF) which is a combine of PP and SF were used to identify the clear effect of fibers. Then the fiber reinforced SCCs were compared with two control self-consolidating concretes without fibers, the one with similar composition mixture of the fiber reinforced concrete and the other with fully Portland cement as binder.
The workability of the concretes was assessed for better fibers distribution control and orientation, and homogeneity of the concrete by slump flow test for filling ability, T50 and V-funnel testes for viscosity and J-ring test for passing ability. Even though the inclusion of both steel and polypropylene fibers were hinder the flow characteristics of SCC but by strictly following Densified Mixture Design Algorithm (DMDA) and with the help of high dosage of superplasticizer all mix proportions were controlled to slump flow range of 660 – 750 mm. The mechanical hardened properties of all concretes were carried out by compressive strength, splitting tensile strength, flexural strength, drying shrinkage, and dynamic modulus of elasticity and rigidity. Furthermore, the addition of fibers were asses the durability investigation by chloride-ion penetration, electrical surface resistivity, ultrasonic pulse velocity and sulfate attack. The hardened properties of all concretes with and without fiber addition founds that generally good durable performance. Moreover, the 91 days average compressive strength of the steel and polypropylene fiber reinforced SCCs were obtained within the range of 54 – 65MPa and 36 – 38MPa respectively. Whereas the two control concretes without fiber were obtained a 91 days average compressive strength of 41 and 46MPa for the concrete with the same composition matrix as the fiber reinforced concretes and the other with fully Portland cement as binder respectively.

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