Use of biochar as carbon sequestering additive in cement mortar

Gupta, Souradeep; Kua, Harn Wei; Low, Chin Yang

doi:10.1016/j.cemconcomp.2017.12.009

Cited by 309 publications

(99 citation statements)

References 55 publications

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“…The high porosity of biochar qualifies it to be considered as an internal curing agent in cementitious materials [13,14]. Internal curing consists of supplying water to the hydrating Portland cement paste from the onset of mixing to increase the degree of hydration when needed.…”

Section: Internal Curing In Cementitious Compositesmentioning

confidence: 99%

“…These compounds are arranged in an irregular manner and in complex forms. The physical and chemical composition of biochar depends largely on the heating rate, combustion temperature, and the particle size of the feedstock [12,13]. Its composition and particle size can closely resemble that of its feedstock.…”

Section: Introductionmentioning

confidence: 99%

“…The larger the pores, the easier the water can penetrate the particles [12]. Considering these properties, biochar is being introduced in construction material such as concrete, mortar, and even asphalt binders as an internal curing agent and a potential reducer of atmospheric carbon [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Microstructure Properties of Biochar-Based Mortar: An Internal Curing Agent for PCC

Mrad

Chehab

2019

Sustainability

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In pursuing sustainability targets, the construction industry has witnessed significant efforts exerted on exploring new alternatives for raw materials. Such initiatives aim to alleviate concerns of overexploitation of natural resources leading to their depletion. On a different note, the disposal of municipal solid waste (MSW) has also become a major concern in some countries, such as the case of Lebanon, where illegal dumping continues to take its toll on the environment. Pyrolysis has been introduced as a biomass decomposition process of MSW and is considered an environmentally friendly process that can mitigate open dumping. However, pyrolysis produces significant amounts of biochar as a byproduct that in turn needs to be disposed of or treated. This research aims to investigate the viability of using biochar as a sustainable alternative material to sand in cementitious mortar composites. A thorough microscale physicochemical characterization of the biochar is conducted prior to its inclusion in mortar. Then, its incorporation as a partial replacement of sand in mortar is assessed at the mesoscale level, based on performance indices that included compressive strength and microstructure properties. Analysis of the experimental results are used to provide guidelines and recommendations as to the effective incorporation of biochar fraction in cementitious mortar.

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Section: Internal Curing In Cementitious Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical and Microstructure Properties of Biochar-Based Mortar: An Internal Curing Agent for PCC

Mrad

Chehab

2019

Sustainability

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“…At shorter times, however, the curves were not observed to clearly fit the linear model defined by Equation 1. Rather, as other authors observed [4,[61][62][63][64][65], this stage can be better described by a bi-linear curve in which the process is divided into two phases: i) primary absorption, governed by capillary suction in the early hours of the test; and ii) secondary absorption that takes place subsequently at a lower rate, because as a rule large pores fill up more slowly [19,63,66,67]. That behaviour is described in standard ASTM C1585 [68], which defines the water absorption coefficient due to capillary action as the slope on the least squares regression line for a water absorption per area -t 0.5 plot in the first 6 h ( ̴19 min 0.5 ), whereas the secondary rate would be found by the same procedure in the period between 1 day and 7 days (38 min -0.5 to 100 min 0.5 ).…”

Section: 4water Absorption Due To Capillary Actionmentioning

confidence: 60%

Water transport in binary eco-cements containing coal mining waste

Caneda-Martínez

Medina

Rojas

et al. 2019

Cement and Concrete Composites

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This study explores certain indirect, water transport-related durability indicators for mortars containing thermally activated coal mining waste (ACMW) at replacement ratios of 20 % and 50 %. This replacement of ordinary Portland cement (OPC) by ACMW could reduce CO 2 emissions and improve energy efficiency by using fewer fossil resources. ACMW was observed to generate a finer pore structure and raise the volume of pores accessible to water. In the mortars with 50 % ACMW, the approximate 30 % rise pore volume led to lower density and consequently lower mechanical strength. The rate of total water absorption declined by 13 % and the rate due to capillary action by 24 % in mortars with 20 % ACMW, whilst no significant variations in either relative to the OPC reference were found in the materials with 50 % replacement ratios. Permeability to water penetration under pressure rose substantially in both blended mortars, although as the maximum and mean depth values were below the ceilings laid down in Spain's structural concrete code the materials would be classified as impermeable. The mortars with 20 % replacement exhibited no greater drying shrinkage than the OPC materials, whereas the mortars bearing 50 % ACMW shrank by approximately 50 % more than the reference.

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“…Recently, attempts to add biochar to cement mortar were made for carbon sequestration. 21,22 By adding 2 wt% biochar to cement in mortar, the compressive strength and impermeability of the mortar were significantly improved. However, an environmental evaluation of concrete-based construction materials has not been performed.…”

mentioning

confidence: 99%

Evaluation of commercial biochar in South Korea for environmental application and carbon sequestration

Shin

Seo

et al. 2020

Env Prog and Sustain Energy

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The performance of commercial wood chip (WC) and biosolid (BS) biochars available in bulk from carbonization processes in South Korea was examined via determination of sorption capacity from batch experiments and evaluation of carbon sequestration using biochar-mortar composites according to construction and environmental properties. Compared with rice straw (RS) biochar synthesized in a laboratory, the sorption capacities of WC and BC biochars are determined by the types of contaminants, the properties of the biochar, and sorption mechanisms. BS and WC biochars are competitive as sorbents for nitro explosives and chlorinated phenols. Characterization of biochar-mortar composites showed that 3-5 wt% biochar inclusion did not significantly change the composites' engineering properties, including flowability, compressive strength, and thermal conductivity. As the biochar content increased in the biochar-mortar composites, the benzene and toluene concentrations in air were accordingly reduced, suggesting that biochar inclusion may be favorable to remove volatile toxic contaminants that cause sick building syndrome. The toxicity characteristics leaching procedure (TCLP) and Micotox ® bioassay tests showed that biocharmortar composites were not toxic. These results suggest that BS and WC biochars in South Korea are competitive as sorbents for some organic contaminants and that biochar-mortar composites may be environmentally friendly carbon-sequestering construction materials.

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Use of biochar as carbon sequestering additive in cement mortar

Cited by 309 publications

References 55 publications

Mechanical and Microstructure Properties of Biochar-Based Mortar: An Internal Curing Agent for PCC

Mechanical and Microstructure Properties of Biochar-Based Mortar: An Internal Curing Agent for PCC

Water transport in binary eco-cements containing coal mining waste

Evaluation of commercial biochar in South Korea for environmental application and carbon sequestration

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