Abstract
Concrete is an obvious source of global carbon dioxide emissions. In recent years, many kinds of pulverized biochar materials have been used in cement composites to improve the carbon capture ability as well as to enhance the mechanical properties. In this study, bamboo biochar is used to replace some cement to make biochar mortar, in order to improve the compressive strength and crack-resistance ability. By the measurement of the main oxidation chemicals of bamboo biochar, it is found that bamboo biochar meets the requirements of class N – pozzolan and has pozzolanic reaction ability. Thus, it can be used as a useful admixture to mortar. The compressive strength of biochar mortar is higher than that of the control mortar without bamboo biochar, due to the filling and self-curing effects of bamboo biochar. The logarithmic formula and negative exponential formula are used to describe the age strength relationship of biochar mortar at early period. Then the initial and final compressive strength are introduced to illustrate the influence of biochar dosage on the compressive strength of mortar during different age. On another hand, biochar mortar has larger initial cracking fracture toughness and unstable fracture toughness than the control mortar, indicating that bamboo biochar is beneficial for mortar to resist crack initiation and propagation, although it decreases the critical crack length. Considering the compressive strength and fracture toughness, 1–3 wt% replacement of bamboo biochar to cement is suggested as the optimal dosage for mortar in this study.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.