EFFECTS OF NANO-SILICA ON MECHANICAL PROPERTIES AND DURABILITY OF CONCRETE

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FIROOZMAKAN S.; RAMEZANIANPOUR A.A.; EBADI T.; BAHRAMI H.

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Paper Information

Journal: JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING (UNIVERSITY OF TABRIZ) Year:2012 | Volume:42 | Issue:1 (66) Page(s): 35-45

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Title

EFFECTS OF NANO-SILICA ON MECHANICAL PROPERTIES AND DURABILITY OF CONCRETE

Author(s)

FIROOZMAKAN S. | RAMEZANIANPOUR A.A. | EBADI T. | BAHRAMI H. | Issue Writer Certificate

Keywords

NANO-SILICA

CONCRETE

COMPRESSIVE SRENGTH

DURABILITY

Abstract

Right now, knowledge horizon has set by Nanotechnology. Nanotechnology refers to development, manufacture, design and use of products with a size between one up to one hundred nanometers. Mechanical properties and DURABILITY of CONCRETE may get improved using NANO-SILICA as well as increasing the useful life of the structure which results in environmental pollutions-such as production of greenhouse gas (CO2)- decreasing and make it more easier to achieve sustainable development. Present paper aims to consider influences of nanosilica addition on mechanical and DURABILITY properties of CONCRETE. Some experiments including compressive strength, water permeability, sorptivity, rapid chloride penetration and electrical resistance were conducted. Moreover, NANO-SILICA impact on cement paste microstructures incorporating were studied through SEM test. The percentages of NANO-SILICA that replace PC (Portland Cement) in this research are 0%, 2.5%, 4.5%, 6.5% and 8.5% by mass. The water/ (clinker + NANO-SILICA) or (w/c) ratio is 0.45 having a constant total binder content of 400 kg/m3. Generally, the results showed that all the investigated properties as well as microstructure of CONCRETE are improved by increasing content of NANO-SILICA. Nano-SiO2 particles can react with calcium hydroxide Ca (OH)2 crystals, which are mostly formed in the interfacial transition zone (ITZ) between hardened cement paste and aggregates and produce secondary C–S–H gel. Thus, the size and amount of calcium hydroxide crystals are significantly reduced, and more C-S-H fills the voids in interfacial transition zone (ITZ) to improve the density of matrix. Hence, the improvement in the CONCRETE having 2.5% NANO-SILICA was insignificant compared with other specimens due to the low amount of NANO-SILICA. In addition, no significant improvement was observed at more than 28 days old. This trend deals with high pozzollanic activity of nanosilica and the acceleration of hydration progress. According to the scanning electron micro-graphs (SEM) of cement paste and the results of X-ray diffraction (XRD) tests, it can be concluded that the size of needle-shaped of ettringite and the amount of calcium hydroxide are reduced and formation of hydration products was denser and more homogenous at early ages.

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APA: Copy

FIROOZMAKAN, S., RAMEZANIANPOUR, A.A., EBADI, T., & BAHRAMI, H.. (2012). EFFECTS OF NANO-SILICA ON MECHANICAL PROPERTIES AND DURABILITY OF CONCRETE. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING (UNIVERSITY OF TABRIZ), 42(1 (66)), 35-45. SID. https://sid.ir/paper/340435/en

Vancouver: Copy

FIROOZMAKAN S., RAMEZANIANPOUR A.A., EBADI T., BAHRAMI H.. EFFECTS OF NANO-SILICA ON MECHANICAL PROPERTIES AND DURABILITY OF CONCRETE. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING (UNIVERSITY OF TABRIZ)[Internet]. 2012;42(1 (66)):35-45. Available from: https://sid.ir/paper/340435/en

IEEE: Copy

S. FIROOZMAKAN, A.A. RAMEZANIANPOUR, T. EBADI, and H. BAHRAMI, “EFFECTS OF NANO-SILICA ON MECHANICAL PROPERTIES AND DURABILITY OF CONCRETE,” JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING (UNIVERSITY OF TABRIZ), vol. 42, no. 1 (66), pp. 35–45, 2012, [Online]. Available: https://sid.ir/paper/340435/en

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