Carbon Sequestration, Mechanical Properties and Carbonation Kinetics of PP-Fiber-Reinforced Cement-Based Composites with CO2-Curing Treatment

Abstract

The development of sustainability and high toughness in cement-based composites with polypropylene (PP) fiber is becoming increasingly important for future buildings, while CO2-curing treatment at early ages is precisely a promising technique for it. The present work reported the carbon sequestration and the mechanical property variations of different cement-based composites with and without PP fiber, 10% silica fume, and varied w/b ratios of 0.25 and 0.18. Carbonation–hydration kinetics of CO2-cured cement-based composites was also focused on. It was found that PP fiber promoted the CO2 uptake of cement-based composites with the utilization of two separate evaluation methods; the maximum CO2 uptake reached almost 11.0% in B-2 samples. The samples with enhanced carbon sequestration showed an obvious colorless area from the outside surface extending to the center. A much more drastic carbonation heat flow and heat release behavior than the subsequent hydration heat was also revealed in cement-based composites with CO2-curing treatment. Hence, this study provides an alternative way of using CO2-curing treatment on PP-fiber-reinforced cement-based composites to develop sustainable cement-based composites in the future.

Carbon Dioxide Uptake Estimation for Spanish Cement-Based Materials

“…Several studies found in the literature are related to the potential for mineralizing carbon dioxide into concrete through carbonation curing of cement-based materials [27][28][29].…”

Carbon Dioxide Uptake by Brazilian Cement-Based Materials

“…Silva et al [17] found promising results in the cement paste powder generated in the recycling process of concrete, which is a material composed mainly of hydrated cement, and was subjected to carbonation. Hu et al [18] found that the addition of polypropylene fibers enhanced the CO 2 uptake of cement-based materials subjected to the CO 2 -curing process. According to Xuan et al [19], the use of eggshell powder added to the Portland cement under carbonation-curing conditions improved the mechanical characteristics and durability of the cement-based materials.…”

Carbonation Curing and Kinetics of Wood-Sodium Silicate Composites

“…10 The ecofriendly choice and use of wood fibers in these composites will help in long-term carbon storage while improving the mechanical properties of the composites. 11 The potential of carbonated cured wood-geopolymer (such as SS)based composites, how they perform mechanically and thermally, will aid in establishing proper optimization processing methods for different applications. 12 In the presence of CO 2 , SS reacts to form silica gel with the subsequent removal of water to form a hardened glass material and a byproduct of sodium carbonate (Na 2 CO 3 ) and silica (SiO 2 ) as seen in chemical eq 1 and stoichiometric eq 2.…”

“…Carbonation curing, which is the diffusion of CO 2 into the pores of a matrix, has been used in different studies with common uses in composites made of natural fibers like wood and cement to stabilize and improve the mechanical properties of the materials. − Carbonation products formed during curing can fill the voids and pores of the composites improving densification and increasing the strength and durability of the composites . The ecofriendly choice and use of wood fibers in these composites will help in long-term carbon storage while improving the mechanical properties of the composites . The potential of carbonated cured wood-geopolymer (such as SS)-based composites, how they perform mechanically and thermally, will aid in establishing proper optimization processing methods for different applications .…”