Journal of Civil Engineering and Environmental Technology p-ISSN: 2349-8404; e-ISSN: 2349-879X; Volume 3, Issue 5; April-June, 2016, pp. 426-429 © Krishi Sanskriti Publications http://www.krishisanskriti.org/Publication.html Effect on Compressive Strength of Concrete by Partial Replacement of Cement with Nano Titanium Dioxide and Nano Calcium Carbonate Shivanshu Mishra 1 and Archana Tiwari 2 1 Student Department of Civil Engineering, Madhav Institute of Technology and Science Gwalior, India 2 Department of Civil Engineering, Madhav Institute of Technology and Science Gwalior, India E-mail: 1 shivanshumishra07@gmail.com, 2 archana62in@gmail.com Abstract—In this paper resulting change in the compressive strength of the concrete due to the partial replacement of cement by Nano- titanium di oxide and Nano-calcium carbonate are studied. Two types of concrete were prepared by replacing cement by Nano titanium dioxide and Nano calcium carbonate. Eight sets of specimens are casted and compared with the control specimen. In both types of concrete 0.5%, 1%, 1.5%, 2% by weight of cement is replaced by Nano material. In case of concrete prepared by using  2 the maximum compressive strength is achieved at 2% replacement and in case of concrete prepared by using ܥܥ 3 the maximum strength is achieved at 0.5% replacement. As compared to the control concrete an increase of 38.5% is achieved in 28 days compressive strength in  2 concrete and 38.4% in case of ܥܥ 3 concrete. The characteristic of the Nano- 2 and Nano-ܥܥ 3 containing concrete is examined at the 7, 14, and 28 days 1. INTRODUCTION Concrete is the spine of the construction industry. The concrete in the pavement is subjected to various types of loads in a repeated form due to which various types of failure occurs in the concrete such as cracks due to over load and flexure. Flexural fatigue also responsible for failure of concrete pavement which can be reduced by use of nano material. Maximum improvement in flexural fatigue strength is reported best in concrete containing nano  ଶ in amount of 1% by weight of binder[1].Most uniform dispersion of hydration products of cement is achieved at a small content of nano  ଶ , it accelerates the hydration at early age ages as indicated by heat of hydration [2].Cement replacement up to 20% by mixture of nano and micro ܥܥ ଷ resulted in similar enhanced mechanical properties. Benefits of accelerated early age hydration through additional nucleation sites and enhanced particle packing density achieved [3]. Ali nazari reported decrease in setting time of cement mortar with increase in nano  ଶ and improvement in flexural and tensile strength with the addition of Nano  ଶ up to 1% at all ages of concrete [8,11]. Reduction in 28 days compressive strength of mortar is reported when  ଶ increases. Inclusion of  ଶ in cement mortar did not increase the 28 days compressive strength [10]. There are various nano materials available which are used frequently because of their dispersion quality such as carbon nano tubes(CNTs) and carbon nano fibers which provide reinforcement to the concrete and other particles such as nano  ଶ , nano  ଶ , nano ܣ ଶ  ଷ , nano ܨ ଶ  ଷ , nano ܥܥ ଷ etc. Nano-titanium dioxide and nano- calcium carbonate are used in this study. Small amount of  2 results in effective increase in strength of the concrete thus it seems beneficial to use this material in the construction work by simply adding it in to the concrete. Nano calcium carbonate in the concrete can also be used similarly. 2. MATERIALS AND EXPERIMENTS 2.1 Materials The materials used are given below. Cement. Portland Pozzolana Cement (prism) Fly ash based conforming to (IS: 1489-1991). The physical properties of cement were obtained by conducting appropriate tests. Specific gravity is 2.9 Fineness- 2% retaining on 90 micron sieve Coarse aggregate Locally available 20 mm and 12.5mm size crushed granite with specific gravity 2.70 and water absorption 0.1%. Fine aggregate River sand was used and found to be Zone 2 with its specific gravity 2.60 and water absorption 1%. Water Water used was clean drinking fresh water (pH value 6-7) which is free from impurities and therefore, can be used for concrete mixing.