Effects of Elevated Temperature on Cement Mortor by Adding Sodium Silicate

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2017 by IJETT Journal
Volume-47 Number-6
Year of Publication : 2017
Authors : G.Saranpriya, Mr.S.Vijaya Baskar
  10.14445/22315381/IJETT-V47P251

MLA 

G.Saranpriya Mr.S.Vijaya Baskar "Effects of Elevated Temperature on Cement Mortor by Adding Sodium Silicate", International Journal of Engineering Trends and Technology (IJETT), V47(6),318-321 May 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
The main aim of our project is to increase the fire resistance in mortar by adding certain chemicals which has high fire resisting property. We are adding a chemical called sodium silicate in two different proportions. Then heating the mortars at various temperature such as 3000 C, 6000 C. Generally, sodium silicate is a glass forming aggregate. Sodium silicate is the common name for compounds with the formula Na2(SiO2)nO. A well known member of this series is sodium Metasilicate, Na2SiO3. Also known as waterglass or liquid glass, these materials are available in aqueous solution and in solid form. The pure composition are colourless or white, but commercial samples are often greenish or blue owing to the presence of iron-containing impurities. Cement mortar treated with a sodium silicate solution helps to reduce the porosity in most masonry products. A chemicals reaction occurs with the excess Ca(OH)2 (portlandite) present in the cement mortar that permanently binds the silicates on the surface and making them more durable and water repellent. It gives passive fire protection. The reason for choosing this chemical is that it is expensive. While making a mortar cube of 1% and 2% of sodium silicate, we can found the glassy layer formed on all sides of mortar cube. On testing these specimens it was found that adding 1% and 2% of sodium silicate was giving more fire resistance, but compressive strength was reduced to some extent. So the optimum content of the percentage of sodium silicate has to be added.

 References

1) Ali ergun, Gokhankurklu , M.SerhatBaspinar , Mohamad Y. Mansour “ The effect of cement dosage on mechanical properties of concrete exposed to high temperature” , Fire safety journal, 55, 160 – 167, (2013).
2) IvankaNetinger,IvanaKesegic, IvicaGuljas “The effect of high temperatures on the mechanical properties of concrete made with different types of aggregates” , Fire safety journal, 46, 425-430,(2011).
3) Zhixing, Anne – lise Beaucour, Ronan Hebert, Albert Noumowe, Beatrice ledesert “Influence of the nature of aggregates on the behavior of concrete subjected to elevated temperatures” , Cement and concrete research, 41, 392-402,(2011).
4) FaridDebieb, said Kenai “The use of coarse and fine crushed bricks as aggregate in concrete” Construction and Building materials, 22, 886-893,(2008).
5) “Standard test methods for fire tests of building construction and materials,” ASTM E119-08b, ASTM International, westconshohocken, pa, USA, 2008.
6) “Fire design of concrete structures – materials, structures, and modeling,” FIB Bulletin 38, The International Federation for structural concrete, Lausanne, Switzerland, 2007.
7) ACI 216.1, “code requirements for determining fire resistance of concrete and masonry construction assemblies,” ACI 216.1-07/TMS-0216-07, American concrete Institute, FarmingtonHills, Mich, USA, 2007.
8) “EN 1991-1-2: Actions on structures. Part 1-2: general actions – actions on structures exposed to fire,” Eurocode 1, European Committee for Standardization, Brussels, Belgium, 2002.
9) T.Z. Harmathy, Fire Safety Design and Concrete, John Wiley & Sons, New York, NY, USA, 1993.
10) Z.P. Bazant and J.C.Chern, “Stress Induced thermal and shrinkage strains in concrete,” Journal of Engineering Mechanics, Vol. 113, no. 10, pp. 1493-1511, 1987.

Keywords
cement mortar, sodium silicate, portlandite, liquid glass.