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RISS 인기검색어
- 검색키워드
- 저자 : P. Muthupriya (검색결과 2 건)
- 무료
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Performance of Self-Compacting Concrete Containing Different Mineral Admixtures
P. Ramanathan,I. Baskar,P. Muthupriya,R. Venkatasubramani 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.2
Self-Compacting Concrete is an innovative concrete that does not require vibration for placing and compaction. It is able to flow under its own weight, completely filling formwork and achieving full compaction, even in the presence of congested reinforcement. One of the disadvantages of self-compacting concrete is its cost, associated with the use of high volumes of Portland cement and use of chemical admixtures. One alternative to reduce the cost of self-compacting concrete is the use of mineral admixtures such as silica fume, ground granulated blast furnace slag and fly ash, which is finely, divided materials added to concrete during mixture procedure. When these mineral admixtures replace a part of the Portland cement, the cost of self-compacting concrete will be reduced especially if the mineral admixtures are waste or industrial by-product. Moreover, the use of mineral admixtures in the production of selfcompacting concrete not only provides economical benefits but also reduces heat of hydration. The incorporation of mineral admixtures also eliminates the need for viscosity-enhancing chemical admixtures. The lower water content of the concrete leads to higher durability, in addition to better mechanical integrity of the structure. This paper presents an experimental investigation on strength aspects like compressive, flexural and split tensile strength of self compacting concrete containing different mineral admixtures and workability tests for different mineral admixtures (slump, L-box, U-box and T50) are carried out. The methodology adopted is that mineral admixtures are replaced by 30%, 40% and 50% for Portland cement and performance is measured and compared. The influence of mineral admixtures on the workability, compressive strength, splitting tensile strength and flexural strength of self-compacting concrete was investigated. The mix proportion is obtained as per the guidelines given by European Federation of producers and contractors of special products for structure. The following inferences were made; optimum dosage of super plasticizer enhanced the flow property of the concrete. As a result, overall improvements in the flow and filling ability of the self-compacting concrete were observed. It is observed that when mineral admixtures used in self-compacting concrete, can reduce the amount of super- plasticizer necessary to achieve a given fluidity. It should be noted that the effect of mineral admixtures on admixture requirements is significantly dependent on their particle size distribution as well as particle shape and surface characteristics. From this view point, a cost effective self-compacting concrete design can be obtained by incorporating reasonable amounts of silica fume, fly ash, and ground granulated blast furnace slag.
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A. Anitha,V.G. Kalpana,P. Muthupriya 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
The performance of Light Weight Self-Compacting Concrete (LWSCC) incorporated with Sintered Fly Ash and Vermiculiteare investigated in this study. The robustness and hardened properties of the LWSCC is investigated at diverse proportioningrates where Cement, Fine Aggregate and Coarse Aggregate are replaced with Fly Ash (FA) (25%), Vermiculite (1-9%) andSintered Fly Ash (SFA) (10-50%) respectively. The workability properties such as Filling ability, Passing ability, viscosity andthe mechanical properties such as density, compressive strength, tensile strength, flexural strength, ultrasonic pulse velocity,acid and sulphate resistance were studied. The percentage loss in weight and loss in compressive strength due to Acid attackand Sulphate attack at the age of 28 days of LWSCC were observed by immersing in 10% of HNO3, magnesium sulphate andsodium sulphate solutions. Vermiculite with SFA considerably boosted the workability and mechanical properties of LWSCCmixes. The presence of lightweight aggregates reduced the strength loss caused by sodium and magnesium sulphate ions. Acombination of 5% of Vermiculite and 30% of SFA resulted with the best robustness and hardened property of concrete
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