MOC Cement-Based Composites with Silica Filler and Wood Chips Ash Admixture

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F20%3A43920314" target="_blank" >RIV/60461373:22310/20:43920314 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1757-899X/960/2/022081/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/1757-899X/960/2/022081/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1757-899X/960/2/022081" target="_blank" >10.1088/1757-899X/960/2/022081</a>

Jazyk výsledku

angličtina

Název v původním jazyce

MOC Cement-Based Composites with Silica Filler and Wood Chips Ash Admixture

Popis výsledku v původním jazyce

Billions of metric tons of Portland cement are produced over the Earth annually which represents serious environmental burden due to the release of huge amount of CO2 within the decomposition of limestone and burning of coal in cement production plants. As Portland cement and cement-based materials are the most widespread materials in construction industry, there is a concern to develop and search cement alternative materials with similar or better functional properties and a lower negative environmental impact. Magnesium oxychloride (MOC) cement is considered as low-energy and low-carbon binder possessing some advantageous properties superior to Portland cement. Therefore, lightweight MOC cement-based composites were designed and tested in the presented study. As filler, silica sand was used in composition of control composite mix. Later, it was partially replaced with wood chips ash coming from bioenergy production from biomass. The chemical composition and morphology of raw additives were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses. For the hardened composites, bulk density, specific density, and total open porosity were measured. Among mechanical parameters, flexural and mechanical strengths were tested. The thermal performance of composites was studied using a transient hot disk method and the assessed parameters were thermal conductivity and volumetric heat capacity. The use of fly ash led to the great decrease in porosity compared to the control materials with silica sand as only filler. The mechanical strength of all developed materials was high. If required, this makes possible lightening of the composite structure and thus improvement of thermal insulation performance. Both the compressive strength and flexural strength decreased with the dosage of wood chips ash in composite mix. However, the decrease in mechanical resistance was lower than the sand replacement ratio. It clearly proved assumption of filler function of fly ash, whereas its assumed reactivity with MOC cement components was not proven. The heat transport was partially mitigated by wood chips ash use, similarly as heat storage. Based on the obtained data, the developed composites were considered as alternative low-carbon materials possessing interesting functional properties for construction practice. Moreover, the reuse of by-product from biomass bioenergy treatment can be considered as an environmentally friendly solution for production of sustainable advanced building materials.

Název v anglickém jazyce

MOC Cement-Based Composites with Silica Filler and Wood Chips Ash Admixture

Popis výsledku anglicky

Billions of metric tons of Portland cement are produced over the Earth annually which represents serious environmental burden due to the release of huge amount of CO2 within the decomposition of limestone and burning of coal in cement production plants. As Portland cement and cement-based materials are the most widespread materials in construction industry, there is a concern to develop and search cement alternative materials with similar or better functional properties and a lower negative environmental impact. Magnesium oxychloride (MOC) cement is considered as low-energy and low-carbon binder possessing some advantageous properties superior to Portland cement. Therefore, lightweight MOC cement-based composites were designed and tested in the presented study. As filler, silica sand was used in composition of control composite mix. Later, it was partially replaced with wood chips ash coming from bioenergy production from biomass. The chemical composition and morphology of raw additives were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses. For the hardened composites, bulk density, specific density, and total open porosity were measured. Among mechanical parameters, flexural and mechanical strengths were tested. The thermal performance of composites was studied using a transient hot disk method and the assessed parameters were thermal conductivity and volumetric heat capacity. The use of fly ash led to the great decrease in porosity compared to the control materials with silica sand as only filler. The mechanical strength of all developed materials was high. If required, this makes possible lightening of the composite structure and thus improvement of thermal insulation performance. Both the compressive strength and flexural strength decreased with the dosage of wood chips ash in composite mix. However, the decrease in mechanical resistance was lower than the sand replacement ratio. It clearly proved assumption of filler function of fly ash, whereas its assumed reactivity with MOC cement components was not proven. The heat transport was partially mitigated by wood chips ash use, similarly as heat storage. Based on the obtained data, the developed composites were considered as alternative low-carbon materials possessing interesting functional properties for construction practice. Moreover, the reuse of by-product from biomass bioenergy treatment can be considered as an environmentally friendly solution for production of sustainable advanced building materials.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA19-00262S" target="_blank" >GA19-00262S: Kompozity na bázi reaktivního hořečnatého cementu s vybranými příměsemi a aditivy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

IOP Conference Series: Materials Science and Engineering

ISBN

—

ISSN

1757-8981

e-ISSN

—

Počet stran výsledku

6

Strana od-do

022081

Název nakladatele

IOP Publishing

Místo vydání

Bristol

Místo konání akce

Praha

Datum konání akce

15. 6. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—