Nano materials in concrete technology can lead to structures with improved quality and better lifecycle cost. Nano Silica is an aspiring material that can change the performance of concrete in many ways. Nano Silica being a new material requires a lot of study to understand the behavior of the concrete composite with Nano Silica. In this investigation Nano Silica was added in four different proportions as 0.5 wt%, 1 wt%, 1.5 wt% and 2 wt% of cement, into the concrete mix to study its performance. The mixture was tested for its consistency to understand the water demand and workability. It was observed that the water demand increased with increase in Nano Silica content and superplasticizer can be utilized to improve the workability without increasing the water to cement (W/C) ratios. The hardened concrete displayed enhancement in compressive strength, flexural strength and split tensile strength when Nano Silica was used. The best results were seen when 1.5 wt% Nano silica was added. The corrosion resistance property was studied applying impressed current technique, where the current consumption is allowed to increase with time. The Nano Silica improves the pore structure of the concrete, this leads to improved corrosion resistance in concrete with increase in Nano Silica content. The theoretical and experimental values of mass loss due to corrosion matched only after 80 hours of accelerated corrosion for normal concrete and 60 hours for enhanced concrete.
Reinforced concrete (RC) structures are often subjected to extreme dynamic loading conditions, mainly caused by effects of impact loading. A countable studies have been carried out on the structural behaviour of RC slabs under static and dynamic loadings. However, it is relatively infrequent to examine the impact behaviour of RC slabs that are embedded with non-conventional reinforcement layouts. Consequently, an experimental study was performed to examine the impact behaviour of geogrid reinforced concrete slabs. A total of six RC slab specimens embedded with different combination of steel and geogrid reinforcement layers was tested under drop weight impact test. The impact response in terms of failure modes, impact energy, impact ductility index and maximum deflection produced at each impact blow were studied. The results showed that, the RC slab specimens provided with geogrid reinforcement layer at both faces of slab specimens along with the conventional reinforcement resisted the crushing of concrete by spreading the impact stress to a larger area. This configuration of reinforcement also helps to withstand for higher impact forces, thereby influencing the enrichment in impact energy and impact ductility index.
An experimental study on effect of fibres in impact resistance and toughness behaviour of concrete is outlined in this paper. The investigation is carried out with steel, glass and polypropylene fibre in suitable combination. Hybrid Fibre Reinforced Concrete (HFRC) means advanced concrete form manufacturedby a specific fibre mix. The main motive for adding fibres in the composite is to control cracks, enhances the impact resistance and increases the toughness characteristics of the concrete. The impact test conducted using drop weight type test apparatus and the toughness value predicted using flexural testing machine as per the standards JSCE-SF 4 and ACI respectively. Experimental findings showed that the introduction of hybrid fibers into concrete can regulate the formation and propagation of cracks due to stress competently and increase concrete strength and impact strength.
Emergent countries employ the broad toughened building resources such as plastic powder, silica fume and other ingredients in concrete. In accumulation, steel slag has been introduced as an alternative of coarse aggregate to put together concrete encompass good possessions. This paper describes the results of a coordinated work carried out using plastic powder, steel slag and silica fume to form the concrete. New research on concrete mix M20 was carried out for 7, 28 days by 0 ( zero) percent, 10 percent, 20 percent, 30 percent replacement of fine aggregate by plastic powder, similarly steel slag was replaced by coarse aggregate and their mechanical properties of concrete were addressed by 10 percent addition of silica fume by cement credence. Bending strength has been addressed for 7 days, 28 days depending on the optimum amount of replacement of concrete strength. Depending on the optimum prescribed amount of replacement in concrete strength, flexural strength has been addressed for 7, 28 days. The experimental and finite element analysis results have been analyzed using computational techniques.
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