High strength concrete containing natural pozzolan and silica fume

Shannag, M. Jamal

doi:10.1016/s0958-9465(00)00037-8

Cited by 302 publications

(102 citation statements)

References 6 publications

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“…The average particle size is 0.1µm or about two orders of magnitude finer than cement particles. The specific area is in the order of 20m 2 /g measured by the nitrogen absorption method, and the relative density is around 2.2 [46,47]. Therefore, silica fume is a very fine siliceous material that reacts with the lime liberated during the hydration of Portland cement and forms stable cementitious products [48].…”

Section: <Figure 1>mentioning

confidence: 99%

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Tam

2008

Construction and Building Materials

240

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Recycling demolished concrete as recycled aggregate can be applicable to most construction applications. Lower-grade applications, including sub-base and roadwork, have been practicing in many countries; however, higher-grade activities are rarely discussed. This paper develops two mixing approaches by adding silica fume into certain percentages of Recycled Aggregate (RA) in the pre-mix procedure, named as Two-Stage Mixing Approach (silica fume) (TSMA s ) and adding silica fume and proportional amounts of cement into certain percentages of RA in the first mix, named as Two-Stage Mixing Approach (silica fume and cement) (TSMA sc ). Experimentation highlights that improvements have been recorded resulted from the use of various RA percentages from both TSMA s and TSMA sc . The additions of silica fume and proportional cement content in the pre-mix on TSMA s and TSMA sc can fill up the weak areas in the RA and thus develop a stronger interfacial layer around aggregate, and hence a higher strength of the concrete. It, thus, concludes that TSMA s and TSMA sc can provide alternative methodologies for further improvement in quality of this recyclable material.

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confidence: 99%

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Tam

2008

Construction and Building Materials

240

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“…This construction material is used in high-rise buildings to avoid the use of unacceptably oversized columns on lower floors, to allow large column spacing and more usable floor space, or to increase the overall height of the building without detracting from the aesthetics and function of the lower floors [1]. Furthermore, because of the low permeability characteristics, high strength concrete performs much better under harsh climate conditions and in marine environments, therefore reducing maintenance and repair costs [2]. However, high strength concrete is more brittle than normal concrete and for this reason, utilization of high strength concrete is seriously limited [3e6].…”

Section: Introductionmentioning

confidence: 99%

Combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete

Nili

Afroughsabet

2010

International Journal of Impact Engineering

287

102

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a b s t r a c tThis study investigated the impact resistance and mechanical properties of steel fiber-reinforced concrete with waterecement ratios of 0.46 and 0.36, with and without the addition of silica fume. Hooked steel fibers with 60-mm length and an aspect ratio of 80, with three volume fractions of 0%, 0.5%, and 1% were used as the reinforcing material. In pre-determined mixtures, silica fume is used as a cement replacement material at 8% weight of cement. The experimental results show that incorporation steel fibers improve the strength performance of concrete, particularly the splitting tensile and the flexural strengths. A remarkable improvement was observed in impact resistance of the fibrous concretes, as compared with the reference materials. The results demonstrate that when steel fiber is introduced into the specimens including silica fume, the impact resistance and the ductility of the resulting concrete are considerably increased.

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“…However, the strength enhancement of both the ITZ and the paste phase will likely be larger than the stress increase, thereby rendering improved mechanical performance to the quartz mortar when silica fume is incorporated in the paste phase. This has been demonstrated through experimental studies (Hu & Li, 2015;Shannag, 2000). The stress increase inside the quartz inclusions has an insignificant influence on material failure because of the higher strength of quartz particles (Axelson & Edgar, 1950).…”

Section: Influence Of Matrix and Itz Stiffening With Silica Fume Addimentioning

confidence: 87%

Micromechanical Modeling for Material Design of Durable Infrastructural Materials: The Influence of Aggregate and Matrix Modification on Elastic Behavior of Mortars

Das

Maroli

Neithalath³

2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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This paper reports the fundamental difference in microstress distributions in traditional hardened cement paste with quartz inclusions and a cement paste with lightweight aggregate (LWA) inclusions using microstructurebased numerical simulation involving finite element method with periodic boundary conditions. Variation of relative stress distributions under varying component material properties and varying microstructural features in both the systems is elucidated for a comprehensive understanding. The presented microstructure-based numerical technique accurately captures the stress concentrations inside microheterogeneous systems, which is otherwise not detectible using analytical homogenization schemes. Numerical simulations reveal that strengthening and stiffening of matrix and interfacial transition zone (ITZ) with silica fume incorporation as cement replacement in LWA incorporated cementitious systems has a detrimental effect in terms of overall strength of the material, contrary to traditional quartz-based cement mortar system. Proper selection of stiffness and strength of LWA inclusions is critical towards performance of such materials. This paper links the microstructure with mechanical behavior of two different microheterogeneous materials and provides valuable input towards material design of such non-traditional cementitious systems with different inclusions.

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High strength concrete containing natural pozzolan and silica fume

Cited by 302 publications

References 6 publications

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc

Combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete

Micromechanical Modeling for Material Design of Durable Infrastructural Materials: The Influence of Aggregate and Matrix Modification on Elastic Behavior of Mortars

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