Carbon Dioxide (CO₂) Sequestration In Bio-Concrete, An Overview

Abstract

Abstract. The emission of CO 2 into atmosphere which has increased rapidly in the last years has led to global warming. Therefore, in order to overcome the negative impacts on human and environment, the researchers focused mainly on the reduction and stabilization of CO 2 which represent the main contributor in the increasing global warming. The natural capturing and conversion of CO 2 from atmosphere is taken place by biological, chemical and physical processes. However, these processes need long time to cause a significant reduction in CO 2 . Recently, scientists shifted to use green technologies that aimed to produce concrete with high potential to adsorb CO 2 in order to accelerate the reduction of CO 2 . In the present review the potential of bio-concrete to sequestrate CO 2 based on carbonation process and as a function of carbonic anhydrase (CA) is highlighted. The factors affecting CO 2 sequestration in concrete and bacterial species are discussed. It is evident from the literatures, that the new trends to use bio-concrete might contribute in the reduction of CO 2 and enhance the strength of non-reinforced concrete.

Optimization of Bio-Foamed Concrete Brick Strength via Bacteria Based Self-Healing and Bio-Sequestration of CO2

“…Therefore, it can be inferred that the healing process in bio-concrete pores leads to an increase in compressive strength. However, higher bacteria concentrations occasionally led to excessive bacteria activity, which disrupted the matrix integrity and ultimately decreased the compressive strength [ 17 ].…”

“…According to Rafat Siddique (2011), bacteria concentration is one of the most critical factors affecting the performance and compressive strength of bio-concrete [ 16 ]. While increasing the bacteria concentration increases compressive strength, exceeding the optimum value can have a negative effect [ 17 ]. Furthermore, higher cell concentrations disrupt the integrity of the matrix due to excessive microbial activity.…”

Technological Strategies to Mitigate the Climate Change: Current Status and Future Trends

“…The mineralization of CO 2 is a process of precipitation that produce stable compounds such as green concretes [41], cement [42], calcium carbonates [43], and use CO 2 as the precursor of concrete block and cement mortar with enhanced properties [44,45]. Chemical transformation of raw materials, CO 2 and biomass, into value-added and neutral-carbon products, such as urea [46], formaldehyde [47], carbonates [48], carbamates [49], polycarbonates y polycarbamates [50]; is a promissory way to create a carbon economic system.…”