Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/210234
Title: INFLUENCE OF ACCELERATED CARBONATION CURING ON THE MECHANICAL AND DURABILITY PROPERTIES OF BIOCHAR MORTAR
Authors: SARAH TAN MING HWEE
Keywords: Biochar
CO2-saturated
Accelerated Carbonation Curing
Pre-Soaked
Compressive Strength
Flexural Strength
Carbonation Depth
Water Absorption
Issue Date: 23-Nov-2021
Citation: SARAH TAN MING HWEE (2021-11-23). INFLUENCE OF ACCELERATED CARBONATION CURING ON THE MECHANICAL AND DURABILITY PROPERTIES OF BIOCHAR MORTAR. ScholarBank@NUS Repository.
Abstract: While there are various methods to reduce carbon dioxide (CO2) emission by the cement industry, integrating multiple methods could potentially elevate the potential of CO2 adsorption and sequestration in cement mortar. This paper investigates the effect of three forms of carbonation curing: “external” carbonation of mortar by Accelerated Carbonation Curing (ACC), “internal” carbonation of mortar by CO2-saturating biochar, and the combination of both carbonation types, on the mechanical and durability properties of mortar. Thailand Mixed Wood Biochar (“Thailand Biochar”) was used, and both “internal” and “external” carbonation curing was conducted for 14 hours each. The small pore volume of dry Thailand Biochar limits its CO2 absorption capability. Therefore, internal carbonation results in only a slight densification in mortar by Calcium Carbonate (CaCO3) formation, leading to a less effective CO2 penetration during external carbonation. This lowered the amount of water loss needed for subsequent internal curing, and thus the extent of compressive strength and water-tightness reduction in mortar. As such, when dry Thailand Biochar is added into mortar, internal and external carbonation curing can be synergistically integrated to promote CO2 utilisation and ensure the desired properties of cementitious composites. However, the presence of water in pre-soaked Thailand Biochar increases its CO2 absorption capability. Therefore, the large amount of CaCO3 formed during internal carbonation resulted in the excessive densification in mortar, which debonds the biochar to mortar. The subsequent air voids formed proved to be detrimental to its mechanical strength and water-tightness development. However, additional CaCO3 formed during external carbonation can fill the air voids formed. As such, internal and external carbonation curing should be implemented simultaneously in pre-soaked Thailand Biochar-mortar, to attain both CO2 sequestration yet reduce the adverse effects of internal carbonation on the physical properties of mortar.
URI: https://scholarbank.nus.edu.sg/handle/10635/210234
Appears in Collections:Bachelor's Theses

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Sarah Tan Ming Hwee DBE.pdf50.92 MBAdobe PDF

RESTRICTED

NoneLog In

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.