An Experimental Study on The Influence of Nano Silica on the Strength and Durability Characteristics of Self Compacting Concrete (original) (raw)
Related papers
EFFECT OF NANO SILICA INCLUSION ON STRENGTH AND DURABILITY PROPERTIES OF SELF COMPACTING CONCRETE
This paper presents a study Self-compacting concrete (SCC) which is also considered as a concrete which can be placed and compacted under its own weight with little or no vibration without segregation or bleeding. The use of SCC with its improving productions techniques is increasing every day in concrete production. Recently, nano particles have been gaining increasing attention and have been applied in many fields to fabricate new materials with novel functions due to their unique physical and chemical properties. In this work 40Mpa self-compacting concrete is developed using modified Nan-Su method of mix design.Slump flow, J-Ring, V-funnel tests are conducted to justify the fresh properties of SCC and are checked against EFNARC (2005) specifications. Specimens of dimensions 150x150x150mm were cast without nano silica and with two different grades of nano silica which is in colloidal state with 16% and 30% nano content are added in different percentages(1%, 1.5% and 2% by weight of cement) to SCC. To justify the compressive strength for 7and28days, specimens are tested under axial compression. Durability propertieswere also studied by immersing the specimensin5% HCl and5% H 2 SO 4. Sorptivity test has also been conducted.Test results indicate that use of Nano Silica in concrete has improved the performance of concrete in strength as well as in durability aspect
Effect of Nano Silica on Mechanical Properties and Durability of Normal Strength Concrete
Archives of civil engineering, 2012
Nano technology is an emerging field of interest for civil engineering application. Among the nano materials presently used in concrete, nano-silica possess more pozzolanic nature. It has the capability to react with the free lime during the cement hydration and forms additional C-S-H gel giving strength, impermeability and durability to concrete. Present paper investigates the effects of addition of nano silica in normal strength concrete. Three types of nano-silica in the form of nano suspension having different amount of silica content have been investigated. Mix design has been carried out by using particle packing method. X-Ray diffraction (XRD) analysis has been carried out to find the chemical composition of control concrete and nano modified concrete. Further, experimental investigations have been carried out to characterize the mechanical behaviour in compression, tension and flexure. It has been observed that the addition of nano-silica in normal strength concrete increased the compressive strength and decreased the spilt tensile strength and flexural strength. Also, Rapid chloride permeability test (RCPT) has been conducted to know the chloride permeability of control concrete, nano modified concrete, and nano coated concrete. It has been observed that the chloride permeability is less for nano coated concrete.
Impact of nano silica on strength and durability properties of selfcompacting concrete
International Journal of ADVANCED AND APPLIED SCIENCES
This paper reflects self-compacting concrete which is developed using modified Nan-Su mix design. Slump flow, J-Ring, V-funnel tests are conducted to justify the fresh properties of SCC and are checked. Cubes of 150x150x150mm size casted in which 15 cubes are SCC without Nano silica and 15 cubes are of each 1 %, 1.5% and 2% of Nano silica (colloidal state with 16% and 30% Nano content). In order to get relative idea about the compressive strength and durability properties of SCC, axial compression test on cubes for 7 days and 28days of curing in water were done and also cubes were immersed in 5% HCl and 5% H2SO4 respectively. Sorptivity test has also been conducted to assess durability of SCC. Test results indicate that use of Nano Silica in SCC has improved the performance of SCC in strength as well as in durability.
Experimental Investigation on Durability Properties of Concrete Added with Nano Silica
Rasayan Journal of Chemistry, 2019
The study examined the durability properties of concrete added with Nano-silica. Lifeline buildings and other infrastructures have highlighted concrete durability issues. The use of nanoparticles in materials based on cement has been recently attractive because of the unique properties at Nano-level that they are able to achieve. This can be prominently utilized in enhancing the ductility of cement-based composites which are generally brittle, also cracks at the nanoscale could be arrested by incorporating carbon nanotube or carbon nanofiber. Nano-silica has a unique advantage in the potential pozzolanic-reaction with cement hydration products over other nanoparticles. Addition of Nano-silica is known to redefine pore size and distribution which would alter the durability of the concrete. Durability properties were tested by checking how concrete of grade M30, with 2% by weight of its cementitious materials replaced with Nano-silica, withstands in alkali environment, acidic environment, sulphate environment, and in a water curing in comparison to conventional concrete of M30 grade in respective environments. The Nanofiller effect and the pozzolanic-reaction increased the homogeneity of the microstructure and the porosity, particularly at the Interfacial Transition Zone, which decreased the permeability of deteriorating gases. Durability tests validated the positive effects of Nano-silica added to concrete. The distribution of pore size also showed that Nano-silica refined the large capillary pores, subsequently decreasing the permeability nature of concrete, enhancing its durability. Also, Nano-silica added concrete mix shows increased compression strength, tensile strength, and flexural strength compared to the conventional concrete mix.
Performance of Self Compacting Concrete with Partial Replacement of Cement with Nano-Silica
International journal for research in applied science and engineering technology ijraset, 2020
Self compacting concrete – a special concrete with an extra ordinary property of compacting itself, reduces the possibility of human error. With this, the combination of Nano-Silica gives a marvellous strength in the construction field. Though the use of self compacting concrete reduces the cost of manual compaction, the use of self compacting concrete along with Nano-silica particles helps in finishing the construction work faster by acquiring strength faster. This present study is about the influence of Nano technology on the properties of self compacting concrete. By adding Nano materials like Nano silica, the rate of hydration, permeability, durability, compressive strength, split tensile strength, flexural strength is increased with increase in concentration of Nano-silica. Application of nano materials in concrete technology can potentially change the service life and life cycle cost of construction infrastructure. This study presents the behaviour of self compacting concrete(SCC) with partial replacement of cement with Nano-silica. The objective of the investigation is to develop a reinforced concrete beam with Nano-silica as partial replacement for cement. Then the results are to be compared with conventional beams.
EFFECT OF NANO-SILICA ON SELF COMPACTING CONCRETE (SCC) AS PARTIAL REPLACEMENT OF CEMENT
IRJET, 2022
Concrete is a construction material composed of cement, fine aggregate (sand) and coarse aggregate. The application of nano technology in self-compacting concrete has added a new dimension to the efforts to improve its properties. Nano materials, by virtue of their very small particle size can affect the concrete properties by altering the microstructure. In this research self-compacting concrete has been tested with and without Nano-silica as partial replacements of cement by 0%, 3%, 4% and 5% by the weight of cement. Fresh properties by L-Box, slump test, V-funnel, of concrete has been tested and Compressive strength, tensile strength and flexural strength has been checked after 7 days, 14 days, 28 days and 56 days., consumption of cement in concrete in this research his reduced by replacing cement by Nano-silica. Self-compacting concrete flows and settles under its own weight and any kind of vibration for compaction is not required. Hence, reduces noise and on site manpower (labour) to operate vibrator. Nano-silica is very fine material its size is in Nano range 236 nm and is pozzolanicin nature. The results further revealed that optimum dosage is 4%.
Mechanical properties and microstructure of high performance concrete containing stabilized nano-silica, 2017
Nanotechnology can significantly improve the mechanical strength and durability of concrete. At the nanoscale, good dispersion of constituent materials is an essential factor for the improvement of concrete properties. In this scenario, the objective of this research was to evaluate the mechanical properties of high performance concrete containing stabilized nano-silica. The incorporation of nano-silica to the polycarboxylate chemical admixture allowed its application in concrete, since the nano-silica was evenly dispersed in the concrete mass. For this study, three different concretes were employed: a reference concrete, one containing stabilized nano-silica and another containing a mixture of silica fume and stabilized nanosilica. The evaluated concrete mechanical properties were the axial compressive strength and secant modulus of elasticity measured in three different ages. The results indicated a substantial increase in concrete compressive strength and modulus of elasticity with the addition of stabilized nano-silica combined with a reduction in cement content. The results also showed that use of stabilized nano-silica proved to be very advantageous, especially when mixed with silica fume. When they were combined, a synergy effect occurred in the concrete that was of chemical nature in addition to the physical effect of better concrete particle packaging. Analysis by scanning electron microscopy showed the improvement in microstructure of concretes with stabilized nano-silica, which contributed to gains in mechanical properties.
Materials & Design, 2012
In this paper, mechanical, rheological, durability and microstructural properties of high performance self compacting concrete (HPSCC) incorporating SiO 2 micro and nanoparticles have been investigated. For this purpose, a fraction of Portland cement was replaced by different amounts of microsilica, nanosilica and blend of micro and nanosilica as 10%, 2% and 10% + 2% respectively. Three different binder contents as 400, 450 and 500 kg/m 3 with a constant water to binder ratio (w/b = 0.38) were investigated. Rheological properties were determined through slump flow time and diameter, V-funnel flow time and L-box tests and mechanical characteristics were determined. Durability properties were evaluated by water absorption, capillary absorption, Cl ion percentage and resistivity tests. Microstructure of the concrete was also assessed via scanning electron microscopy (SEM). The results showed that the properties improved significantly for the specimens containing micro and nanosilica. Improvement of Cl ion percentage and resistivity results in the micro and nanosilica blended mixtures was also noticeable. From the microstructure point of view, the SEM micrographs showed more refined and packed pore structure of the concrete containing admixtures especially at longer ages which could lead to enhancement of strength and the durability properties of HPSCC specimens.
Strength, Durability & Permeability Studies on Cement Concrete with & without Nano-Silica
ASPS Conference Proceedings 1: 1583-1588 (2022), 2022
The application of nanomaterials in cement/concrete has resulted in the development of smart materials which are durable, sustainable and high performance oriented apart from being eco-friendly. Several types of nanomaterials are being used by researchers all over the world to improve the properties of cementitious system, amongst them silica nanoparticles (SNPs) have been credited with high pozzolanic reactivity and pore filling effects. It is also very well known that permeability is the major factor for deteriorations of concrete structures in the long term thus affecting its durability. A thorough study was performed on cement mortar composites and standard grade concrete with the additions of colloidal silica nanoparticles(SNPs) in various dosages starting from 0.5%,0.75%,1.0%,1.25% and 1.5% by weight of cement(b.w.c.) to understand the impact from micro-structure improvement to macro-level property enhancement. The results show that in presence of colloidal SNPs (Indian branded) having 35-40% active nano content with 5-40nm particle size the strength increase at 28 days is 32% increasing to 59% at 90 days. An influence on durability is also observed with strength increasing from 4% to 8% with the addition of more SNPs from 0.75% to 1.0% b.w.c. The microstructural investigations reveal that silica nanoparticles refines the pore structure due to accelerated hydrated mechanisms leading to the creation of more hydration products and thus to a more denser microstructure. A M-40 grade standard concrete was prepared as per IS:10262 with the addition of optimized SNPs as found for cement mortar composites strength results at 28 days maximum strength keeping the water-cement(w/c) ratio fixed at 0.4. Tests were conducted on concrete to find out the compressive strength and permeability of concrete. The compressive strength of concrete containing nano materials were found to be 24% more than that of normal cement concrete (NCC) of M-40 grade. The permeability values were found to be decreased by 57% with the addition of nano silica particles to concrete.
Strength, Durability and Permeability Studies on Cement Concrete with and without Nano-Silica
ASPS Conference Proceedings, 2022
The application of nanomaterials in cement/concrete has resulted in the development of smart materials which are durable, sustainable and high performance oriented apart from being eco-friendly. Several types of nanomaterials are being used by researchers all over the world to improve the properties of cementitious system, amongst them silica nanoparticles (SNPs) have been credited with high pozzolanic reactivity and pore filling effects. It is also very well known that permeability is the major factor for deteriorations of concrete structures in the long term thus affecting its durability. A thorough study was performed on cement mortar composites and standard grade concrete with the additions of colloidal silica nanoparticles(SNPs) in various dosages starting from 0.5%,0.75%,1.0%,1.25% and 1.5% by weight of cement(b.w.c.) to understand the impact from micro-structure improvement to macro-level property enhancement. The results show that in presence of colloidal SNPs (Indian branded) having 35-40% active nano content with 5-40nm particle size the strength increase at 28 days is 32% increasing to 59% at 90 days. An influence on durability is also observed with strength increasing from 4% to 8% with the addition of more SNPs from 0.75% to 1.0% b.w.c. The microstructural investigations reveal that silica nanoparticles refines the pore structure due to accelerated hydrated mechanisms leading to the creation of more hydration products and thus to a more denser microstructure. A M-40 grade standard concrete was prepared as per IS:10262 with the addition of optimized SNPs as found for cement mortar composites strength results at 28 days maximum strength keeping the water-cement(w/c) ratio fixed at 0.4. Tests were conducted on concrete to find out the compressive strength and permeability of concrete. The compressive strength of concrete containing nano materials were found to be 24% more than that of normal cement concrete (NCC) of M-40 grade. The permeability values were found to be decreased by 57% with the addition of nano silica particles to concrete.