The use of coagulated silica as active mineral admixture in cement-based fine grained mortars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00322358" target="_blank" >RIV/68407700:21110/18:00322358 - isvavai.cz</a>

Výsledek na webu

<a href="https://aip.scitation.org/doi/10.1063/1.5047633" target="_blank" >https://aip.scitation.org/doi/10.1063/1.5047633</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5047633" target="_blank" >10.1063/1.5047633</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The use of coagulated silica as active mineral admixture in cement-based fine grained mortars

Popis výsledku v původním jazyce

In this paper, the possible use of commercially produced coagulated silica for preparation of fine-grained cement mortars is examined. Chemical and physical analysis of coagulated silica is performed first and the obtained data is compared with reference values measured for Portland cement. In mortars composition, coagulated silica is used as a substitute for Portland cement. The replacement ratio is 5-20 vol. %. The dosage of batch water is 0.5 and is maintained similar for all mortars mixes. Behaviour of fresh mortars is characterized by penetration time. For the hardened samples cured 28 days in water, bulk density, matrix density, and total open porosity are accessed. The contribution of coagulated silica to the mechanical resistance of the developed mortars is evaluated on the basis of flexural strength, compressive strength, and Young’s modulus measurements. In addition, liquid water transport parameters and thermal properties of hardened samples are tested. Obtained results show gradual shortening of enetration time with increasing content of silica in mortar mix. On the other hand, the use of coagulated silica led to the decrease in the total open porosity and thus improved mechanical resistance of silica-enriched mortars compared to reference material. The effect of silica use on mortars liquid water transport properties is minimal, typically in the range of measuring uncertainty. The embedded air gaps in the coagulated clusters partially retarded heat transport in silicacement-based hardened products, the highest decrease in thermal conductivity of approx. 23 % is observed for mortar with 15% cement replacement. Base on the performed experimental tests, the tested coagulated silica can be applied for improvement of specific properties of cement-based construction materials, considering its chemical and physical parameters.

Název v anglickém jazyce

The use of coagulated silica as active mineral admixture in cement-based fine grained mortars

Popis výsledku anglicky

In this paper, the possible use of commercially produced coagulated silica for preparation of fine-grained cement mortars is examined. Chemical and physical analysis of coagulated silica is performed first and the obtained data is compared with reference values measured for Portland cement. In mortars composition, coagulated silica is used as a substitute for Portland cement. The replacement ratio is 5-20 vol. %. The dosage of batch water is 0.5 and is maintained similar for all mortars mixes. Behaviour of fresh mortars is characterized by penetration time. For the hardened samples cured 28 days in water, bulk density, matrix density, and total open porosity are accessed. The contribution of coagulated silica to the mechanical resistance of the developed mortars is evaluated on the basis of flexural strength, compressive strength, and Young’s modulus measurements. In addition, liquid water transport parameters and thermal properties of hardened samples are tested. Obtained results show gradual shortening of enetration time with increasing content of silica in mortar mix. On the other hand, the use of coagulated silica led to the decrease in the total open porosity and thus improved mechanical resistance of silica-enriched mortars compared to reference material. The effect of silica use on mortars liquid water transport properties is minimal, typically in the range of measuring uncertainty. The embedded air gaps in the coagulated clusters partially retarded heat transport in silicacement-based hardened products, the highest decrease in thermal conductivity of approx. 23 % is observed for mortar with 15% cement replacement. Base on the performed experimental tests, the tested coagulated silica can be applied for improvement of specific properties of cement-based construction materials, considering its chemical and physical parameters.

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/GA18-07332S" target="_blank" >GA18-07332S: Vlastnosti, trvanlivost a chování lehkých maltových směsí s minerálními plnivy</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

THERMOPHYSICS 2018: 23rd International Meeting of Thermophysics 2018

ISBN

9780735417045

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

6

Strana od-do

"020039-1"-"020039-6"

Název nakladatele

AIP Publishing, APL, the American Institute of Physics

Místo vydání

Melville, NY

Místo konání akce

Smolenice

Datum konání akce

7. 11. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000450557800039