Reuse of walnut shell waste in the development of fired ceramic bricks

Barnabas, Abel; Balogun, Oluwatosin Abiodun; Akinwande, Abayomi Adewale; Ogbodo, John Friday; Ademati, Akeem Oladele; Dongo, Enesi Isaac; Romanovski, Valentin

doi:10.1007/s11356-022-22955-4

Cited by 18 publications

(3 citation statements)

References 89 publications

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“…When the ratio of K-feldspar was fixed at 15%, with an increase in CaCO 3 , the porosity of thermal insulation bricks increased to 48.8% (Figure 6a), the cumulative pore volume increased to 0.38 mL g −1 (Figure 6d), and the average pore size reached a maximum value of 780 nm (Figure 6c), which was attributed to the porogenic effect of CO 2 . Barnabas et al [28] produced energy-efficient bricks by adding 10 wt% walnut shells to clay and found that the thermal decomposition of the organic matter in walnuts produced large amounts of CO 2 gas, increasing the porosity of bricks by 10%. It should be noted that when the CaCO 3 ratio increased from 15 wt% to 20 wt%, the average pore size decreased, probably because the decomposition of excess CaCO 3 produced a large amount of Ca-feldspar that caused a dense distribution of small pores inside the insulation brick.…”

Section: K-feldspar Promotes the Conversion Of Caco 3 To Ca-feldsparmentioning

confidence: 99%

Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Zheng,

Cui,

Gao

et al. 2023

Materials

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Coal gangue is a solid waste with low carbon content discharged during the course of the coal mining process. The resource utilization of coal gangue could solve environmental problems caused by its excessive production, such as soil contamination and land occupation. This study proposed to produce high-strength thermal insulation bricks using coal gangue as the primary material and three other mineral powders as auxiliary materials, including K-feldspar, CaCO3 and fly ash. A systematic analysis was conducted to explore the optimum raw material addition ratio and optimum sintering temperature; then, the intrinsic structure of thermal insulation bricks and their sintering formation mechanisms were revealed. The results showed that the optimal ratios of coal gangue, K-feldspar, CaCO3 and fly ash were 65 wt%, 15 wt%, 10 wt% and 10 wt%, respectively; the compressive strength of the thermal insulation brick produced under this ratio was 22.5 MPa; thermal conductivity was 0.39 W m−1 k−1. During sintering processes, mineral powders sufficiently fused to form a skeleton, and the CO2 derived from CaCO3 formed pores. The optimum sintering temperature was 1150 °C, because at this temperature, K-feldspar had the best effect in promoting the conversion of CaCO3 to Ca-feldspar. The high level of the relative crystallinity of Ca-feldspar (about 76.0%) helped raise the Si–O network’s polymerization degree (NBO/T = 1.24), finally raising the compressive strength of thermal insulation bricks. The innovative method of using coal gangue to make thermal insulation bricks not only solved the environmental pollution caused by coal gangue but also provided excellent construction materials with high practical application value.

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Section: K-feldspar Promotes the Conversion Of Caco 3 To Ca-feldsparmentioning

confidence: 99%

Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Zheng,

Cui,

Gao

et al. 2023

Materials

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“…To achieve high levels of energy efficiency in buildings, and reduce their energy consumption while preventing any kind of heat loss through the envelope, it is crucial to improve the building envelope by using various biosourced construction materials, especially as this choice will contribute to the energy recovery of these waste materials of organic origin known as biomass. In this context, some studies have been carried out, including the use 728 NUMERICAL SIMULATION STUDY OF THE EFFECT OF INTEGRATING HEMP CONCRETE of wood waste [5], cannabis waste [6], straw waste, date palm waste [7], walnut shell waste [8], and other natural waste materials.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation study of the effect of integrating hemp concrete and passive strategies on the energy consumption of a residential building in Al-Hoceima

Kaddouri,

ABIDOUCHE,

SAIDI HASSANI ALAOUI

et al. 2024

Stat., optim. inf. comput.

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In this work, we present an energy efficiency study for a residential building located in the city of Al-Hoceima, Morocco. The aim is to bring the building into compliance with the technical requirements of the Moroccan Thermal Building Regulations (RTCM). To achieve this, several modifications and interventions were carried out, such as the use of hemp concrete for insulation and the integration of passive strategies to minimize energy loads. Similarly, this energy study is carried out as a simulation using TRNSYS software, so that the building is modeled as a multizone entity with an occupancy schedule. The simulation results show that the technical requirements of the RTCM are achieved using a construction containing hemp concrete with an optimum thickness of around 10cm, this thickness can be reduced to 4cm using double glazing, or to 1cm using controlled natural ventilation in summer and winter.

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“…In a similar vein, and concerning insulation using so-called biomass materials, several studies have dealt with materials such as hemp waste, walnut shell waste, wood waste, and waste from wheat straw and date palms [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Impact of Insulation using Bio-sourced Materials on the Thermal and Energy Performance of a Typical Residential Building in Morocco

Hicham Kaddouri,

Abderrahim Abidouche,

Mohamed Saidi Hassani Alaoui

et al. 2024

ARFMTS

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Among the measures to be taken to design and construct buildings with envelopes that are more energy-efficient, sustainable, and environmentally friendly is thermal insulation using a very wide range of insulating materials, either synthetic or of natural origin or derived from biomass. The present work represents a thermal and energy study aimed at improving the thermal comfort levels and energy requirements of a typical residential building located in the city of Al-Hoceima, Morocco. To this end, a series of numerical simulations were carried out using TRNSYS software to assess the impact of applying three bio-based insulation materials, namely hemp wool, wood fiber, and expanded cork, in the wall layer of the building. Different insulation scenarios were studied to make a choice that would ensure optimum comfort in the building with low energy demand. The results of this study show that insulating the roof with 8 cm of hemp wool contributes to energy savings of up to 36.7% and 35.2% for cooling and heating demand respectively. In thermal terms, improvements in the temperature inside the building have been achieved: in January, the maximum temperature recorded is 20.94°C, while in July, the maximum temperature is around 26.80°C.

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Reuse of walnut shell waste in the development of fired ceramic bricks

Cited by 18 publications

References 89 publications

Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Numerical simulation study of the effect of integrating hemp concrete and passive strategies on the energy consumption of a residential building in Al-Hoceima

Impact of Insulation using Bio-sourced Materials on the Thermal and Energy Performance of a Typical Residential Building in Morocco

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