214 Arshdeep Singh, Rattanjot Singh Dhillon International Journal of Engineering Technology Science and Research IJETSR www.ijetsr.com ISSN 2394 – 3386 Volume 4, Issue 6 June 2017 Experimental Investigation on Effect of Microsilica and Nanosilica on Compressive Strength of High Strength Concrete Arshdeep Singh 1 , Rattanjot Singh Dhillon 2 1 Assistant Professor, Civil Engineering Department, PEC University of Technology, Chandigarh, India 2 Post Graduate Student, Civil Engineering Department, PEC University of Technology, Chandigarh, India Abstract This study concerns with the use of nanosilica and microsilica to improve the compressive strength of concrete. Microsilica (MS) of much finer size then cement has been proven to be affective in improving mechanical properties of concrete. With the advancement in nanotechnology, Nanosilica of even finer size than microsilica can also be used in concrete as cement replacing material. An experimental investigation has been carried out by partially replacing the cement with Nano Silica in varying percentage (i.e. 1%,2%,3%,4% & 5%) and micro silica in varying percentage (i.e. 5%,7%,9%,11%,13% &15%). In this study, cube of sizes 150mm x 150mm x150mm were cast for M-60 grade of concrete and testing of the specimens were performed on compressive strength testing machine after curing of 7days and 28 days. From the test result it was found that even very small of amount of NS (i.e. 2 to 3%) has substantial positive effects on the compressive strength of concrete, but there was very high demand of super plasticizer. Moreover combined addition of MS and NS has significant synergistic effects on the compressive strength (CS) of concrete and on the basis of results obtained it can be advised that NS and MS should be added together to achieve the maximum strength of the concrete however the effect of these material on workability of concrete can be compensated using high range water reducing super plasticizer. Key Words: Compressive strength(CS), Nanosilica (NS), Microsilica (MS). 1. INTRODUCTION Concrete is the material of present as well as future because of its low cost as well as good mechanical properties. The wide use of concrete in structures like buildings, bridges, airports, highways etc. makes it one of the most investigated materials. Due to cater the needs aroused from rapid population explosion and the technology boom, there is an urgent need to improve the strength and durability characteristics of concrete using recent advancements like nanotechnology in concrete[1]. Concrete is defined as "high-strength" solely on the basis of compressive strength at a given age. The ACI Committee on high strength concrete revised the definition to cover mixtures with specified design strength of 55 MPa or more. High strength concretes are made with carefully selected high-quality ingredients and optimized mixture designs. The main requirement is that it should be batched, mixed, placed, compacted and cured to the high quality control. Typically, high strength concretes will have a low water-cementing materials ratio of 0.20 to 0.45. Superplasticizers are usually used to make these concretes workable. Production of high strength concrete may or may not require special materials such as mineral admixtures like microsilica, fly ash, ground granulated blast furnace slag etc. The producer must know the factors affecting compressive strength and know how to vary those factors for best results. [2] Most high strength concrete applications are designed for compressive strengths of 70 MPa. Commercial availability of high-strength concrete provided an economical alternative to bulky columns of conventional concrete for the lower floors of high-rise buildings. [3] 1.1 Nanotechnology in Concrete Nanotechnology applied to concrete includes the use of nanomaterials like Nano Silica, Nano Fibers etc. By adding the nanomaterials, concrete composites with superior properties can be produced. Addition of nanosilica in concretes and mortars results in more efficient hydration of cement.[3] Due to the pozzolanic activity,
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214 Arshdeep Singh, Rattanjot Singh Dhillon
International Journal of Engineering Technology Science and Research
IJETSR
www.ijetsr.com
ISSN 2394 – 3386
Volume 4, Issue 6
June 2017
Experimental Investigation on Effect of Microsilica and
Nanosilica on Compressive Strength of High Strength Concrete
Arshdeep Singh1, Rattanjot Singh Dhillon2
1 Assistant Professor, Civil Engineering Department, PEC University of Technology, Chandigarh, India 2 Post Graduate Student, Civil Engineering Department, PEC University of Technology, Chandigarh, India
Abstract
This study concerns with the use of nanosilica and microsilica to improve the compressive strength of concrete.
Microsilica (MS) of much finer size then cement has been proven to be affective in improving mechanical properties of
concrete. With the advancement in nanotechnology, Nanosilica of even finer size than microsilica can also be used in
concrete as cement replacing material. An experimental investigation has been carried out by partially replacing the
cement with Nano Silica in varying percentage (i.e. 1%,2%,3%,4% & 5%) and micro silica in varying percentage (i.e.
5%,7%,9%,11%,13% &15%). In this study, cube of sizes 150mm x 150mm x150mm were cast for M-60 grade of concrete
and testing of the specimens were performed on compressive strength testing machine after curing of 7days and 28 days.
From the test result it was found that even very small of amount of NS (i.e. 2 to 3%) has substantial positive effects on the
compressive strength of concrete, but there was very high demand of super plasticizer. Moreover combined addition of
MS and NS has significant synergistic effects on the compressive strength (CS) of concrete and on the basis of results
obtained it can be advised that NS and MS should be added together to achieve the maximum strength of the concrete
however the effect of these material on workability of concrete can be compensated using high range water reducing