This investigation aimed to study the sustainable effect of Nano Meta Kaolin (NMK) on some properties of reactive powder concrete. In this study, Reactive powder concrete (RPC) specimens were designed, prepared and cured for different ages (7, 28 and 60) days. The suggested specimens dimensions consist of cubes with (50mm), cylinders with (100×200 mm) and cylinders with (150×300 mm), to study compressive strength, splitting indirect tensile strength, and modulus of elasticity with varied Nano Meta Kaolin content (0, 2%, 3.5% and 5%) by weight of cementitious materials as an addition. All specimens were cured with hot water treatment (60 Cº) for 12 hours, and then put in normal water until testing day. It was found that the compressive strength of concrete with the Nano Meta Kaolin higher than the reference concrete, and also the same trend was observed for the splitting tensile strength. improvement in the compressive strength at 28 days when using (2,3.5, 5%) Nano Meta Kaolin has been about (5-15%), While the improvement in the splitting tensile strength was (3-7%), and the improvement in modulus of elasticity was (10-26%).
This paper experimentally investigates the behavior of a non-prismatic concrete frame using different types of concrete under static and repeated loads. The parametric study includes changing the type of concrete (conventional concrete, steel ber reactive powder concrete (SF-RPC), and glass ber reactive powder concrete (GF-RPC)), and loading type (static and repeated). The results were presented and discussed the effect of SF-RPC and GF-RPC on frame behavior, and compared with the conventional concrete frame through the rst crack load, ultimate load and failure mode, load-de ection curve, and the frame de ected shape. There were evidences of improvement in the frame properties, where a change in the failure mode, an increase in the ultimate load, as well as an increase in the stiffness of the frame in all the types of loading. The ultimate static load increased by 45.9% and 40.5% for SF-RPC and GF-RPC frames, respectively. Using RPC improves fatigue resistance, as the ultimate load decreases by only 2% under the in uence of repeated load. In comparison, the conventional concrete frame decreases by 27%. The use of RPC in the specimens improves the shear strength and stiffness of the frame. The RPC is environmentally friendly through the use of recycled materials in mixtures (silica fume, steel ber, and glass ber), and also the structural sections are small thus the gases emitted (CO 2 ) are few. As well as eliminating the need to consume new materials and impede construction for the public, because of the extension of the structural life.
This paper experimentally investigates the behavior of a non-prismatic concrete frame using different types of concrete under static and repeated loads. The parametric study includes changing the type of concrete (conventional concrete, steel fiber reactive powder concrete (SF-RPC), and glass fiber reactive powder concrete (GF-RPC)), and loading type (static and repeated). The results were presented and discussed the effect of SF-RPC and GF-RPC on frame behavior, and compared with the conventional concrete frame through the first crack load, ultimate load and failure mode, load-deflection curve, and the frame deflected shape. There were evidences of improvement in the frame properties, where a change in the failure mode, an increase in the ultimate load, as well as an increase in the stiffness of the frame in all the types of loading. The ultimate static load increased by 45.9% and 40.5% for SF-RPC and GF-RPC frames, respectively. Using RPC improves fatigue resistance, as the ultimate load decreases by only 2% under the influence of repeated load. In comparison, the conventional concrete frame decreases by 27%. The use of RPC in the specimens improves the shear strength and stiffness of the frame. The RPC is environmentally friendly through the use of recycled materials in mixtures (silica fume, steel fiber, and glass fiber), and also the structural sections are small thus the gases emitted (CO2) are few. As well as eliminating the need to consume new materials and impede construction for the public, because of the extension of the structural life.
The main aim of this research is to evaluate the performance of Nano silica self-compacting concrete which is subjected to severe saline conditions that contain sulfates and chlorides at concentrations similar to those existing in the soils and ground water of the middle and southern parts of Iraq. For this purpose, ordinary and sulfate resistant Portland cement without and with 3% Nano silica addition by weight of cementitious materials were used. Splitting tensile strength, flexural strength, static modulus of elasticity and ultrasonic pulse velocity were investigated for all exposure conditions and all types of mixes of self-compacting concrete at ages of 28, 60, 90, 120 and 180 days. Test results revealed that the inclusion of Nano Silica in concrete mixes improved clearly the mechanical properties of self-compacting concrete compared with reference concrete.
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