Study of Reactive Powder Concrete and Its Characteristics

IJSTE - International Journal of Science Technology & Engineering | Volume 2 | Issue 07 | January 2016 ISSN (online): 2349-784X

Study of Reactive Powder Concrete and its Characteristics Mohammed Bandukwala M. Tech. Student GHRCE, Nagpur

H.G.Sonkusare Assistant Professor GHRCE, Nagpur

Abstract Reactive powder concrete (RPC) is the cement based material which is one of the type of ultra-high performance concrete or we can say that it is an ultra-high strength concrete with an excellent durability. Reactive powder concrete is a new member in concrete family developed in 1990‘s with high ductility composite material and possess superior mechanical property. In this experimental investigation we study the functioning of Reactive Powder Concrete (RPC) with different curing techniques, normal water curing of 25oC and accelerated steam curing at 90 oC due to its different material properties and configuration and also comparison of compressive strength between them. Elements of Reactive Powder Concrete used in this investigation are Cement (ordinary Portland cement), crushed Quartz sand of 100 – 200 mesh and 250 mesh, fine sand , micro silica , steel fibers , aggregate (8mm) , admixture , pure water. Mix proportion in this paper is based on trial and error method and as according to the chemical composition of ingredients. Compressive strength of reactive powder concrete goes up to 45-80 MPA in the present investigation.

Keywords: Reactive Powder Concrete, Durability, Ductility, Ultra-High Strength ________________________________________________________________________________________________________

I. INTRODUCTION Reactive powder concrete is an ultrahigh strength concrete and generally strength is greater than 50 MPA, generally it is sad that concrete strength over 42 MPA is high strength concrete. Basically material is a cement based which has an advance mechanical property and it also has an improved physical property due to which it has high durability, it is one of type of ultra-high performance concrete. Generally Reactive Powder Concrete (RPC) is a light weight concrete so the dead load of the structure also reduces while applying RPC on the structure. Generally it is sad that concrete with higher compressive strength had also a poor ductility due to cement based material but due admixture in the RPC not reduces the quality of ductility of the concrete. It also has low porosity and have a quality to show compressive strength from 50MPA-250MPA. Reactive Powder Concrete is composed of very fine powder material not more than 800 µm materials are cement (OPC), crushed quartz sand and micro silica or we can also called as silica fume. Cement content of Reactive Powder Concrete goes from 750-1000 kg/m3 higher cement content increases production cost and also cause shrinkage problem, replacing cement with mineral admixture is one of the solution of this type of problem. Reactive powder concrete is relatively a new concrete in concrete family and the basic principal due to which RPC is developed is explained by Richard1 and Cheyrezy1 We can also say that Reactive Powder Concrete is not a concrete because there is no coarse aggregate inside the concrete it is one of the type of grout of high compressive strength that’s why it is also used for non-structural component or for repair work.

The main purpose of the present investigation is to compare the compressive strength between the different types of mixes and between different curing types and condition.

Material Property Table – 1 Material Property Cementicious Material

Used as binder

Quartz sand Silica fume Sand Coarse Aggregate Super plasticizer Steel fiber

Max size 90µm Max size 90µm Max size 600µm Max size 8mm P.C based L=35 mm , D=0.60mm

O.P.C 53 GRADE S.G = 3.15 Sp.gravity= 2.59 Sp.gravity= 2.25 Sp.gravity = 2.63 Sp.gravity = 2.77 In required amount Sp.gravity=2.8

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Study of Reactive Powder Concrete and its Characteristics (IJSTE/ Volume 2 / Issue 07 / 018)

II. EXPERIMENTAL PROCEDURE In this study compressive strength of three different types of mixes i.e. Plain Reactive Powder Concrete, Original Reactive Powder Concrete and Modified Reactive Powder Concrete are compared with each other and strengths are tested at 7 days normal curing and 48 hours 90 oC accelerated curing.

Casting Study on Ordinary Portland Cement, reactive mineral such as silica fume and admixture are done which has a good compatibility with cement. Quartz sand with fine particle size 0.074-0.149mm and 0.058mm are used. Super plasticizer if it is in liquid form than it is added with water and then with concrete. Steel fiber is crimped typed with a higher Aspect ratio, it is added because it has high compressive and flexural strength. Size of the specimen is 70x70x70mm respectively. Cubes are casted according to table 2

1 2 3

Table - 2 Casting Composition of the mixture Plain RPC Original RPC Modified RPC

Plain Reactive Powder Concrete is casted using the following material in table 3 Table - 3 Plain Reactive Powder Concrete Materials Weight (kg/m3 ) Cement 775 Quartz sand 310 Sand 860 Silica fume 200 Steel fiber 165 Super plasticizer 30lit/m3 W/C 0.23

Original Reactive Powder Concrete is casted using the following material table 4 Table – 4 Original Reactive Powder Concrete Materials Weight (kg/m3 ) Cement 935 Quartz sand 1040 Silica fume 235 Super plasticizer 30 lit/m3 W/C 0.28

Modified Reactive Powder Concrete is casted by replacing sand by coarse aggregate up to 40% using the following material in table 5 Table – 5 Modified Reactive Powder Concrete Materials Weight (kg/m3 ) Cement 935 Quartz sand 620 Coarse Aggregate 415 Silica fume 235 Super plasticizer 30 lit/m3 W/C 0.26

Test Compressive strength of the following cube specimen where tested at an age of 7 days. Compressive strength due to normal water curing of each specimen.

Type PRPC ORPC MRPC

Table – 6 Test Number of Specimen Compressive Strength (7days) MPA 3 57 3 52 3 50

Compressive strength due to Accelerated curing at 48 hours 90 oC of each specimen.

Table – 7

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Study of Reactive Powder Concrete and its Characteristics (IJSTE/ Volume 2 / Issue 07 / 018)

Type PRPC ORPC MRPC

Compressive strength Number of Specimen Compressive Strength (MPA) 3 78 3 63 3 67

Fig. 1: Comparison of Compressive strength

III. RESULT After the comparison between all types of mixes at different curing condition it is found that accelerated curing is more effective than normal water curing and it provide greater compressive strength as compared to normal water curing.

IV. CONCLUSION     

Over all Plain Reactive Powder Concrete gives the highest compressive strength as compared to ORPC and MRPC because it includes steel fiber also.

MRPC which includes coarse aggregate of size 8mm gives higher strength than ORPC. Accelerated curing is better than normal curing because it requires less time and gives higher strength also.

Reactive Powder Concrete can be used at that place where application of normal concrete is not possible.

It can be generally used as a repair material and also in the earth quake prone areas structures.

REFERENCES [1] [2] [3] [4] [5] [6] [7]

T.Sujatha & D.Basanthi, “Modified Reactive Powder Concrete”, IJEAR Vol. 4, Issue Spl-2, ISSN: 2348-0033, Jan - June 2014.

M K Maroliya, “A State of Art- On development Of Reactive Powder Concrete”, International journal of innovative research and development, ISSN: 2278 – 0211, Vol 1 Issue 8 October 2012.

N. Roux, C. Andrade, and M. A. Sanjuan, “EXPERIMENTAL STUDY OF DURABILITY OF REACTIVE POWDER CONCRETE”, Journal of Materials in Civil Engineering, Vol. 8, No. I, February, 1996, ASCE, ISSN 0899-1561/96/0001-0001-0006.

Annamaria Gisario, Alberto Boschetto and Francesco Veniali, “Hole Damage in Drilling of Reactive Powder Concrete” Journal of Materials in Civil Engineering, Vol. 23, No. 12, December 1, 2011, ASCE, ISSN 0899 1561/2011/12-1579–1588.

Richard P, Cheyrezy M H,“RPC with high ductility and compressive strengths of 200Mpa order”.

M.S.Shetty,"Concrete Technology".

Indian Standard Code: IS10262:2009

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