A Comparative Study on Mechanical Properties of Basalt Fiber Reinforced Concrete with Partial Replacement of Cement with GGBS

Transcription

1 A Comparative Study on Mechanical Properties of Basalt Fiber Reinforced Concrete with Partial Replacement of Cement with S. Sai Charan, CH. L. K Murthy Gupta PG Scholar [Structural Engineering], Asst.professor [Structural Engineering], Gudlavalleru Engineering College, Gudlavalleru Engineering College, Gudlavalleru, A.P, India, Gudlavalleru, AP, India. Abstract: The Present work deals with the addition of Basalt Fibers in to concrete to inspect and compare the Compressive, Split Tensile and Flexural strength of Basalt Fiber Reinforced Concrete [BFRC] with plain M Grade concrete. In this experimental work the Basalt Fibers are chosen in four different proportions i.e..%, %,.%, % &.% respectively to the volume of concrete. Fibers of length. to cm were used in this study. Typically to improve the Tensile and Flexural strengths of concrete, fibers are introduced in to the concrete and it is named as fiber reinforced concrete. Fibers namely Steel, Carbon, Glass, Coir, Basalt.., are commonly preferred to use in concrete. In this work i have also studied the performance of basalt fiber reinforced concrete when the cement is partially replaced with Ground Granulated Blast Furnace Slag ().The replacement of cement with is done in two different percentages i.e. %, % respectively. The results have declared that the use of basalt fibers has significantly increased the flexural and tensile strength of concrete, but decrease in compressive strength of concrete. When the cement has replaced with the strength of the concrete has failed at % respectively. Key words: Basalt fibers, Concrete, Compressive strength,, Flexural test, Split tensile test.. INTRODUCTION Recent developments in the concrete technology have established new ways for improving the mechanical and durability properties of concrete. Addition of Natural/Artificial like Basalt, Steel, Glass, Jute, Nylon, polypropylene.., in to concrete Matrix is one of the satisfactory method for improving the properties of concrete. By including the fibers in to concrete structures it may contribute to improve the structural behaviour of the concrete members. By adding the fibers in to concrete we can overcome the problem like Crack resistance, Corrosive resistance. The name Basalt is originated from a Latin BASALTES [Very hard stone].basalt fibers are originated from the Basalt rock. This Basalt rock is generated with rapid cooling of molten lava on the earth crust. Basically this rock is normally available on the earth surface, beneath of the oceans. Basalt rock is also one type of igneous rock containing -6% of Sio [silica] content to its volume. This basalt rock is naturally very hard and dense material having dark brown in colour similar to the normal ballast rock. Sometimes due to oxidation process its changes to rust-red colour. Normally the Basalt rock and Ballast rocks looks similar, but the difference between them can be judged depending up on their mineral admixtures and their Textures. The Basalt rock is melted at C to 6 C for manufacturing the BASALT FIBERS. From this Basalt rock various types of secondary materials like Basalt fibers, Basalt Rebar s, Basalt fiber pins, Basalt fiber geo girds, Basalt Fabric can be produced. First these basalt fibers are produced as continuous Basalt fibers then after they are chopped in to various sizes based on the use of purpose. The main advantage of the basalt fibers is it doesn t commit any toxic reaction with air and water.. EXPERIMENTAL PROGRAM. Materials Used: In this research work various materials like Cement, Fine Aggregate,Coarse Aggregate, water and Basalt fibers were used and their properties are examined by taking the help of IS [INDIAN STANDARD] codes... Cement: Ordinary Portland cement of Grade was preferred for this study. The physical properties of cement are categorized in table as per IS 6-. Table : Physical Properties of Cement S.No Properties Value Specific Gravity. Initial setting time min Final setting time 6 min Fineness test 6% retained.. Fine aggregate: Locally available river sand was preferred as fine aggregate for entire experimental work. The physical properties of sand was carried out by taking the help of IS 8-97 and IS code books. 6

2 Table : Properties of Fine Aggregate S.No Properties Value Specific Gravity.6 Density kg/m 8 Water absorption Zone II.. Coarse aggregate: Crushed Granite stone of sizes mm and mm were selected for this work. Taking the reference of IS codes the properties of coarse aggregate have been tested. Table : Properties of Coarse Aggregate S.No Properties Value Specific Gravity.7 Crushing value.% Impact value.% Density kg/m 6 Water absorption.6%.. Basalt Fibers: The basalt fibers which I have been choosed were chopped uniformly of. to cm in length. The properties and chemical composition of basalt rock fiber are tabulated in & tables respectively. Fig : BASALT FIBERS Table : Physical Properties of Basalt Fibers S.No Physical properties Suggested values by supplier Length (cm) -6 Yield strength (Mpa) > Density (g/cm ).6 Tensile strength -8 (Mpa) Working temperature ( o C) 6 C-7 C Table : Chemical Composition of Basalt Rock Fiber S.No Major components % present in basalt rock fiber Silicon Dioxide SiO.6-6% Aluminium Oxide 7-8.% Al O Ferric Oxide Fe O -8% Calcium oxide CaO.-7.8% Magnesium Oxide MgO -.%.. Ground Granulated Blast Furnace Slag (): is generated by rapid Chilling of molten iron slag from a blast-furnace in a steam or water to yield a Granular material. This outcome granular material is dried and turned in to a fine power that is termed as. is one of the material which holding the properties similar to the Cement. Table 6: Properties of S.No Chemical Constitution % Percentage in Calcium oxide CaO Silicon Di-oxide SiO 7 Aluminium oxideal O 9- Magnesium oxide MgO 7. CONCRETE MIX PROPORTION: The mix design has carried out by following the specifications and limitations of Indian Standard Code (IS 6-9). The target meant strength was inspected as 8.N/mm for the following mix proportion, the cement content was observed as kg/m, amount of 6.kg/m was noted as a fine aggregate content, coarse aggregate content was observed as kg/m and the water to cement ratio is taken as.. Firstly the fine aggregate, cement and basalt fiber were mixed thoroughly for minute then after coarse aggregate and water are added and mixed thoroughly up to minutes to get a homogeneous mix. At last the specimens (cubes, cylinders and beams) were casted and soon after hours the specimens are remoulded.. RESULTS AND DISCUSSIONS. Cube compressive strength: The capacity of a material or structure to resist the loads disposed to reduce the size is termed as compressive strength of concrete. The compressive strength test is done for cube specimen of sizes **mm for 7 and 8 days of curing. The compressive strength results are mentioned in table 7. Table 7: Compressive Strength of BFRC `Strength in Mpa Conventional 7.. Basalt fibers.% Basalt fibers % 8.. Basalt fibers.% 8..6 Basalt fibers %.6 8. Basalt fibers.%.9 6. Fig : Graph for Compressive strength results of Basalt fiber reinforced concrete (BFRC) 6

3 Strength results for 7 and 8 days Split tensile strength for 7 & 8 days Compressive strength in Mpa Percentage of Basalt fibers Tensile strength in Mpa Percentage of Basalt Fibers Fig : Test for compressive strength.. Flexural strength: The flexural strength of Basalt fiber reinforced concrete was carried out after 7 and 8 days of curing on the beam specimen of size mm*mm*mm.the test was done according to the IS:6-99 code book. The strength values of flexural strength were mentioned in table No 9.Graphical representation of flexural strength are shown in fig. Table 9: Flexural strength of BFRC Flexural Strength in Mpa. Split Tensile Strength: The split tensile strength of BFRC is observed at 7 and 8 days and values are mentioned in table No: 8. for finding out the tensile strength cylinders of height mm * mm in diameter are used in this project. Fig shows the graphical representation of split tensile strength of BFRC. Table 8: Split Tensile strength of BFRC Split Tensile Strength in Mpa Conventional.89. BF.%.8.6 BF %..7 BF.%..7 BF %..8 BF.% Conventional.67. BF.%.. BF %..8 BF.% BF %. 7. BF.% Fig : Graph for Flexural strength of BFRC 8Days Fig : Graph for Split Tensile Strength of Basalt Fiber Reinforced concrete (BFRC) 6

4 . Test results when cement is partially replaced with Ground Granular Blast Furnace Slag (): Case i: % of cement is replaced with. Case ii: % of cement is replaced with. Case i: % of cement replaced with.. Compressive strength results when % of cement is replaced with compressive strength in Mpa M M M M M M6 M7 8 days : M=Conventional M=%+7% cement M=M+BF.% M=M+BF % M=M+BF.% M6=M+BF % M7=M+BF.%.. Tensile strength results when % of cement is replaced with Table : Tensile strength of BFRC when % of cement is replaced with Split tensile strength in Mpa M.9. M..6 M.7.9 M.6. M.. M M7.7. Fig 6: Graphical representation for split tensile strength of BFRC when cement is replaced with Table 9: Compressive strength of BFRC when % of cement is replaced with Compressive strength in Mpa M 9.. M 8 9. M 8.. Tensile strength in Mpa M M M M M M6 M7 M 9. M M M7 7. Fig : Graphical representation for compressive strength of BFRC when cement is replaced with.. Flexural strength results when % of cement is replaced with Table : Flexural strength of BFRC when % of cement is replaced with Flexural strength in Mpa M.67. M..8 M.. M..96 M.6 6. M M7.. Fig 7: Graphical representation for Flexural strength of BFRC when cement is replaced with 6

5 Compressive strength in Mpa Split tensile strength in Mpa Flexural strength in Mpa 7 6 M M M M M M6 M7.. Split Tensile strength results for BFRC when % of cement is replaced with Fig 9: Test for Tensile strength Case ii: % of Cement is replaced with.. Compressive Strength results of BFRC when % of cement is replaced with : V=Conventional Concrete V=6% Cement +% V=V+BF.% V=V+BF % V=V+BF.% V6=V+BF % V7=V+BF.% Table : Compressive strength of BFRC when % of cement is replaced with Compressive Strength in Mpa V 9.. V 7 8. V V 9.. V V V7.8. FIG 8: Graphical representation for compressive strength of BFRC when % of cement is replaced with Table : Split tensile strength for BFRC when cement is replaced with Split tensile Strength in Mpa V.9. V.9.88 V.. V.97. V.6.7 V V7..78 Fig : Graphical representation for tensile strength of BFRC when % of cement is replaced with V V V V V V6 V7 V V V V V V6 V7..6 Flexural strength results for BFRC when % of cement is replaced with 66

6 Flexural strength in Mpa Fig : Test for Flexural strength. CONCLUSION The study of experimental results has specified that effect of Basalt fibers on compressive strength is not significant comparing to Tensile and flexural strengths of concrete. It was observed that % of compressive strength has increased for Basalt fiber reinforced concrete over plain concrete. 69% of split tensile strength has increased when it was compared with plain concrete. Flexural strength has also significantly increased up to 6% when it was correlated with plain concrete. But whenever the cement has replaced with the compressive strength has noted as only increase of to % only. Only a slight increase has examined in Split Tensile strength and flexural strength of BFRC when cement has replaced with. We can arrest the sudden and brittle failures in concrete structures by using these Basalt fibers. Table : Flexural strength for BFRC when % of cement is replaced with Flexural Strength in Mpa V.67. V.9. V.78. V.6.7 V.8. V6..8 V7.96. Fig : Graphical representation of Flexural strength of BFRC when % of cement is replaced with. REFERNCES [] FarhadAslani and BijanSamali, High Strength Polypropylene Fibre Reinforcement Concrete at High Temperature, University Of Technology Sydney, Ultimo, NSW, Australia. March. [] Kunal Singha, A short Review on Basalt fibers, international journal of textile science, ():9-8 [] M.C Nataraja, Fiber Reinforced Concrete-behaviour properties and applications. [] Nihat Kabay, Abrasion resistance and fracture energy of concretes with Basalt fiber, construction and building Materials () 9-. [] Tumadhir M Thermal and Mechanical properties of Basalt fiber Reinforced concrete, world Academy of science, Engineering and Technology, Vol: --6. [6] IS: Specifications of Grade OPC. [7] IS: Methods of testing Aggregates fir Concrete [8] IS:6-9 Recommend Guidelines for concrete Mix Design. 6 V V V V V V6 V7 8Days 67