Flexural and fatigue behavior of prestressed concrete beams  made with portland pozzolana cement

V, Arora V; Singh, Brijesh; Yadav, Lalit

doi:10.18702/acf.2016.06.2.1.15

Cited by 10 publications

(8 citation statements)

References 1 publication

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“…Admixtures like retarders can be added to increase the setting time of RCC. Fine aggregates in RCC are more than compared to standard concrete which can be seen as a difference between RCC and standard concrete [11]. More fine aggregates offer better packing and consolidation [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of high ratio fly ash on roller compacted concrete for dam construction

Ojha¹,

Singh²,

Prakash³

et al. 2022

Res. Eng. Struct. Mater.

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One of the biggest advantages of Roller Compacted Concrete is faster and economic construction along with lesser heat generation. It is primarily used in mass concrete work like in Pavements, Ports and Dams. In this study the properties of Roller Compacted Concrete such as Vee-Bee density, Vee-Bee time, initial setting time, final setting time and compressive strength are studied for twelve mixes prepared using two types of fly ash sources, three cement sources and three admixture types. Furthermore, on one of the mixes with the least cement to fly ash ratio mechanical and thermal property related tests were performed. These tests include split tensile strength, direct tensile strength, modulus of elasticity, Poisson's ratio, apparent cohesion, angle of internal friction, specific heat of concrete by Transient Plane Source (TPS) method and Coefficient of Thermal expansion of Concrete. From the study it was found that compressive strength at 365 days is nearly two times that of 28 days. Also, there is negligible effect of adding admixture on compressive strength of roller compacted concrete. Current study shows that finer the fly ash, higher the compressive strength at later stage. The study on mechanical and thermal properties of Roller Compacted Concrete indicates that results are in line with Indian Standard Specification and Internationally reported values.

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Section: Introductionmentioning

confidence: 99%

Effect of high ratio fly ash on roller compacted concrete for dam construction

Ojha¹,

Singh²,

Prakash³

et al. 2022

Res. Eng. Struct. Mater.

Self Cite

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“…200 sieve is particularly greater for RCC than for conventional concrete and details for this are not laid down in IS: 383-2016 [33]. The larger percentage of fines is needed to fill voids in cement paste that would otherwise be filled with cementitious materials in case of conventional concrete [44][45]. Addition of fines are usually made up of naturally occurring non-plastic silt and fine sand or manufactured fines.…”

Section: Concrete MIX Compositionmentioning

confidence: 99%

Study on effect of fly ash and limestone powder on compressive strength of roller compacted concrete for dam construction

Ojha¹,

Singh²,

Singh³

et al. 2022

JACF

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Roller compacted concrete (RCC) is a special concrete having similar ingredients as in the case of conventional concrete, but in different proportions. Use of fly ash to replace significant proportion of Portland cement (PC) for RCC mix is very popular. However, use of limestone in RCC is not so popular. Limestone can act as an inert filler as well as can take part in hydration process and development of different hydration products to a limited extent. The study attempts to determine the optimal replacement levels of PC using fly ash and limestone for development of high volume fly ash based roller compact concrete with limestone filler for use in construction of dams in India by evaluating the fresh properties (in terms of Vee Bee time, density and setting time) and compressive strength (at 7, 28, 56, 90 and 180 days) for different RCC mixes having varying proportions of PC, fly ash and limestone. The study evaluation of 17 RCC mixes prepared by replacing PC to an extent of 72% (by weight of total cementitious content) using two types of fly ash and two types of limestone from different sources to observe the variations in setting time, short and long-term strength for the concrete. For RCC mixes having ternary cementitious systems (combination of OPC, fly ash and limestone), setting time values were observed to be in between setting times of mixes made with binary cementitious systems (i.e. OPC and limestone & OPC and fly ash). Optimum performance in terms of compressive strength at all the ages was observed for mixes with ternary cementitious system due to the synergistic contributions (physical and chemical) of both fly ash and limestone.

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“…This increase in flexural and split tensile strength of high strength conventional Portland cement concrete is similar to findings of Arora et.al [16,40,41] wherein it was reported that flexural strength of silica fume concrete was higher by 10-15% as compared that of Portland cement concrete for about 12-15 % silica fume addition. The addition of silica fume in concrete mix leads to reduction in the development of cracks at micro level near the interface of cement paste and unreacted cement or pozzolans [30,42,43,44,45]. Modulus of elasticity of M40RGC is about 70.00 % of modulus of elasticity of M40RCC and Modulus of elasticity of M70RGC is about 77 % of Modulus of elasticity of M70RCC.…”

Section: Mechanical Properties Of Mixesmentioning

confidence: 99%

Short-term mechanical performance and flexural behavior of reinforced slag-fly ash-based geopolymer concrete beams in comparison to OPC-based concrete beams

Ojha¹,

Singh²,

Trivedi³

et al. 2022

Res. Eng. Struct. Mater.

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The study presents experimental investigation on short term mechanical properties and flexural behaviour of conventional Ordinary Portland Cement (OPC) based concrete and slag-fly ash based geopolymer concrete. Conventional and geopolymer concrete mixes were designed to achieve compressive strength equivalent to M40 and M70 grade as per Indian standard code. Mechanical properties of concrete mixes such as compressive strength, split tensile strength, flexural strength, modulus of elasticity and Poisson's ratio were evaluated and compared. The flexural behaviour of reinforced concrete beams for both conventional and geopolymer concrete has been studied using 4-point bend test. The findings suggest that geopolymer concrete shows comparable mechanical properties in terms of split tensile strength, flexural strength and Poisson's ratio. However, modulus of elasticity of geopolymer concrete is lower than the conventional concrete of equivalent strength. Studies on flexure behaviour of reinforced concrete beams shows that both geopolymer and conventional concrete exhibit comparable flexural behavior in terms of load-deflection curves, yield load and yield moment. The amount of energy dissipated in flexure is marginally higher for high strength conventional concrete. Based on the visible cracks developed in flexure, it was concluded that the reinforced conventional concrete and reinforced geopolymer concrete show similar number and type of cracks in flexure.

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Flexural and fatigue behavior of prestressed concrete beams made with portland pozzolana cement

Cited by 10 publications

References 1 publication

Effect of high ratio fly ash on roller compacted concrete for dam construction

Effect of high ratio fly ash on roller compacted concrete for dam construction

Study on effect of fly ash and limestone powder on compressive strength of roller compacted concrete for dam construction

Short-term mechanical performance and flexural behavior of reinforced slag-fly ash-based geopolymer concrete beams in comparison to OPC-based concrete beams

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