The most common SCMs used in high-volume applications are fly ash (FA) and ground granulated blast furnace slag (GGBFS). One way of reducing these CO 2 emissions is the use of blended cements in which a part of the Portland cement clinker is replaced with supplementary cementitious materials (SCMs). Promoting low-emission concretes is essential in order to face the crucial challenge to reduce the environmental impact of the construction sector and the concrete industry and to limit the impact of climate change. As a result, it is necessary to find a new concrete material to replace traditional Portland cement concrete, which is environmentally stressful, yet provides an effective building material. Therefore, the impact of cement production on the environment issues a significant challenge to concrete industries in the future. Some researchers have stated that CO 2 emission could increase by 50% compared with the present scope. It is a common viewpoint that finding an alternative material to the Portland cement is imminent. The global cement industry contributes around 6% of all CO 2 emissions. Production of one ton of Portland cement releases one ton of CO 2 into the atmosphere. Cement production emits large amounts of CO 2 and consumes significant amount of energy. INTRODUCTION Cement is the world's most used construction binder material. This paper review the literature related to the studies conducted on geopolymer and repair materials. Repair to damaged concrete are important not only to ensure the planned useful life, but also to provide good performance and security. RCC structures undergo serious durability problems like spalling, erosion, wear, cracking, corrosion etc. Geopolymer concrete is principally produced by utilizing industrial by-product materials such as fly ash, blast furnace slag, and other aluminosilicate materials. Geopolymer is an emerging alternative binder to Portland cement for making concrete.
Cement production emits large amounts of CO2 and consumes significant amount of energy.
Cement is the world's most used construction binder material.
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