CD07-008 APPLICATION OF HYBRID FIBER REINFORCEMENT AND HIGH VOLUME COARSE FLY ASH IN SELF COMPACTING CONCRETE A.A. Mounesan 1 , K. Siamardi 2 , M.M. Khodavirdi Zanjani 2 1 Civil Engineer, Sharif University of Technology, Head Manager of Atisaz Company 2 Civil Engineer, Concrete Research Center, Atisaz Company ABSTRACT Self compacting concrete is termed as a concrete with high flow ability and cohesiveness which can fill its mold without the need of any extra vibration effort. Fiber inclusion to concrete enhances the mechanical properties, while making the concrete less workable. This article presents a study on the fresh and mechanical properties of a fiber reinforced self compacting concrete incorporating high- volume fly ash that does not meet the fineness requirements of ASTM C 618. A poly carboxylic based superplasticizer was used in combination with a viscosity modifying admixture. In mixes containing fly ash, 50% of cement by weight was replaced with fly ash. Two different types of steel fibers were used in combination, keeping the total fiber content constant at 60 kg/m3. Slump flow time and diameter, V funnel, and air content were performed to assess the fresh properties of the concrete. Compressive strength, split tensile strength, and ultrasonic pulse velocity of the concrete were determined for the hardened properties. It can be concluded that high-volume coarse fly ash could successfully be used in producing fiber reinforced SCC. Even though there is some reduction in the concrete strength, because of the use of high-volume coarse fly ash, it is possible to achieve self compaction with considerable fiber inclusion. Keywords: self compacting concrete, fiber reinforcement, high volume coarse fly ash, fresh properties, ultrasonic test 1. INTRODUCTION Use of self compacting concrete (SCC) in the construction industry has been increasing [1] because of its technical advantages such as flowing through the reinforcement and filling every corner of its mold without any need for vibration and compaction during its placement. Generally, SCC is achieved using new generation superplasticizers to reduce the water–binder ratio. In addition, supplementary cementitious or inert materials such as limestone powder, natural pozzolans, and fly ash is also used to increase the viscosity and reduce the cost of SCC. Among these materials, fly ash, a by-product of thermal power plants, has been reported to improve the mechanical properties and durability of concrete when used as a cement replacement material [2]. Concretes having large amounts
APPLICATION OF HYBRID FIBER REINFORCEMENT AND HIGH VOLUME COARSE FLY ASH IN SELF COMPACTING CONCRETE
Jun 02, 2023
Self compacting concrete is termed as a concrete with high flow ability and
cohesiveness which can fill its mold without the need of any extra vibration effort.
Fiber inclusion to concrete enhances the mechanical properties, while making the
concrete less workable. This article presents a study on the fresh and mechanical
properties of a fiber reinforced self compacting concrete incorporating highvolume fly ash that does not meet the fineness requirements of ASTM C 618. A
poly carboxylic based superplasticizer was used in combination with a viscosity
modifying admixture
Welcome message from author
In mixes containing fly ash, 50% of cement by weight was replaced with fly ash. Two different types of steel fibers were used in combination, keeping the total fiber content constant at 60 kg/m3. Slump flow time and diameter, V funnel, and air content were performed to assess the fresh properties of the concrete. Compressive strength, split tensile strength, and ultrasonic pulse
velocity of the concrete were determined for the hardened properties. It can be concluded that high-volume coarse fly ash could successfully be used in producing fiber reinforced SCC. Even though there is some reduction in the concrete strength,
because of the use of high-volume coarse fly ash, it is possible to achieve self compaction with considerable fiber inclusion.
Related Documents
