Repair and rehabilitation of reinforced geopolymer concrete beams an experimental investigation

Abstract

Globally, as the demand for concrete as construction material newlineincreases, the demand for Portland cement also increases. Enormous amount of newlineCO2 is emitted into the atmosphere during the production of cement. Since there newlineis a need to reduce the impact of CO2 emission, several efforts are in progress to newlinereduce the use of Portland cement in order to address the global warming issues. newlineGeopolymer concrete is one of the alternative technologies to reduce the impact newlineof CO2 emission. Since no cement is used in this concrete, it is also known as newline No-cement concrete. The aim of the research is to evaluate the flexural newlinebehaviour of Geopolymer concrete beam with different types of fibres viz., newlineAramid, Basalt, Carbon and E-Glass Fibre mats. Fibres were wrapped in tension newlineside (soffit wrapping) and the results were compared with the reinforced newlineconcrete beams. The material used for the preparation of geopolymer concrete newlinebeam were sodium hydroxide, sodium silicate, Class F flyash, fine aggregate, newlinecoarse aggregate, naphthalene based super plasticizer. A total of 78 beams were newlinecast and tested in this research. This includes 27 Geopolymer Reinforced newlineconcrete beams, 24 Geopolymer Reinforced Pre-cracked concrete beams and 27 newlineReinforced Cement Concrete beams with various wrapping schemes. For ease, newlinethe entire beams were classified into 3 schemes viz., Scheme B-I beams, Scheme newlineB-II beams and Scheme B-III beams. Scheme B-I beams comprise Geopolymer newlineReinforced Concrete Beams. Scheme B-II beams comprise Geopolymer newlineReinforced Concrete Pre-cracked Beams and Scheme B-III beams comprise newlineReinforced Cement Concrete beams. For identification, a six-notation newlineabbreviation GPRCxyi is followed for Scheme B-I beams. Here, GPRC stands newlinefor Geopolymer Reinforced Concrete, xy stands for CB, AF, BF, CF and GF, newlineand i ranges from 1 to 2. For example, GPRCCB stands for Geopolymer newlineReinforced Concrete Control Beam and GPRCAF1 stands for Geopolymer newlineReinforced Concrete beam wrapped with one layer of Aramid Fibre mat. newlineSimilarly, GPRCBF1 stands for Geopolymer Reinforced Concrete Beam newlinewrapped with one layer of Basalt fibre mat and so on. newline newline