Formation, properties, and microstructure of a new steel slag–based phosphate cement

Kód výsledku v IS VaVaI

RIV/68378297:_____/21:00545925 - isvavai.cz

Výsledek na webu

https://doi.org/10.1061/(ASCE)MT.1943-5533.0003958

DOI - Digital Object Identifier

10.1061/(ASCE)MT.1943-5533.0003958

Jazyk výsledku

angličtina

Název v původním jazyce

Formation, properties, and microstructure of a new steel slag–based phosphate cement

Popis výsledku v původním jazyce

The process of obtaining chemically bonded phosphate ceramics generally involves the use of metallic oxides, the preparation of which consumes high quantities of energy. The present study proposes a method to recycle slags generated by a steel production process that is widely used across the world - the electric arc furnace. A chemically bonded phosphate ceramic is produced by exploiting the high content of metals present in the slag, realizing the conditions to mitigate the environmental impact of the industrial by-product. In situ infrared spectroscopy, isothermal conduction calorimetry, and X-ray diffraction revealed that the setting reaction involves the formation of amorphous products in the form of metallic phosphate hydrates and a fraction of calcium silicate hydrates similar to those found in portland cement. This phosphate matrix allows the effective immobilization of heavy metals in the slag, such as Cr and As. According to the results of mechanical tests, which showed compression resistance of 15-25 MPa, and leaching tests, slag-based phosphate cement can be used without restrictions as a construction material for applications such as mortars or bricks.

Název v anglickém jazyce

Formation, properties, and microstructure of a new steel slag–based phosphate cement

Popis výsledku anglicky

The process of obtaining chemically bonded phosphate ceramics generally involves the use of metallic oxides, the preparation of which consumes high quantities of energy. The present study proposes a method to recycle slags generated by a steel production process that is widely used across the world - the electric arc furnace. A chemically bonded phosphate ceramic is produced by exploiting the high content of metals present in the slag, realizing the conditions to mitigate the environmental impact of the industrial by-product. In situ infrared spectroscopy, isothermal conduction calorimetry, and X-ray diffraction revealed that the setting reaction involves the formation of amorphous products in the form of metallic phosphate hydrates and a fraction of calcium silicate hydrates similar to those found in portland cement. This phosphate matrix allows the effective immobilization of heavy metals in the slag, such as Cr and As. According to the results of mechanical tests, which showed compression resistance of 15-25 MPa, and leaching tests, slag-based phosphate cement can be used without restrictions as a construction material for applications such as mortars or bricks.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

GA20-01280S: Kontrola reakční rychlosti a morfosyntézy v hořečnatofosfátových cementech: vliv aditiv

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of Materials in Civil Engineering

ISSN

0899-1561

e-ISSN

1943-5533

Svazek periodika

33

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

04021330

Kód UT WoS článku

000696610300015

EID výsledku v databázi Scopus

2-s2.0-85115075353