Insights into the hydration of Portland cement under hydrothermal curing.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F19%3APU135581" target="_blank" >RIV/00216305:26310/19:PU135581 - isvavai.cz</a>

Result on the web

<a href="http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=D2jvi7u9Rg4IsDq5hzA&page=1&doc=1" target="_blank" >http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=D2jvi7u9Rg4IsDq5hzA&page=1&doc=1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-019-08542-9" target="_blank" >10.1007/s10973-019-08542-9</a>

Result language

angličtina

Original language name

Insights into the hydration of Portland cement under hydrothermal curing.

Original language description

The combined effect of temperature and vapor pressure on hydration reactions of three different types of Portland cements was studied using a laboratory autoclave. Oil well Portland cement Class G high sulfate resistant (HSR), Dyckerhoff Portland cement and Portland cement CEM I 42.5 R Extra were cured under hydrothermal conditions (165 degrees C-0.5 MPa and 220 degrees C-2.0 MPa) up to 7 days. In parallel, hydration reactions at laboratory conditions (25 degrees C-0.1 MPa) of these samples were also studied. Simultaneous thermogravimetric and differential thermal analysis measurements (TG/DTA) were mostly used to characterize the course of hydration under different curing conditions. X-ray diffraction, scanning electron microscopy and mercury intrusion porosimetry were used to identify the hydration products and to characterize the coupled effect of temperature and vapor pressure on microstructure and pore structure development. Also, mechanical properties were correlated with pore structure and scanning electron microscopy analysis. Different hydrothermal curing regimes resulted in sequential and overlapped hydration reactions with products including portlandite, ettringite, poorly crystalline C-S-H, hydrogarnet (C-A-S-H), alpha-C2SH, jaffeite (C6S2H3), scawtite (C7S6C over bar H-2) and reinhardbraunsite (C5S2H). Calcium silicate hydrate underwent systematic changes starting with the transformation of C-S-H gel formed during the non-equilibrium phases or under low-pressure hydrothermal conditions to alpha-C2SH, jaffeite and reinhardbraunsite with increasing hydrothermal temperatures. The gradual transition of amorphous C-S-H phases to alpha-C2SH, C6S2H3, C7S6C over bar H-2 and C5S2H has caused the deterioration of pore structure with corollaries of the increase in permeability and the decrease in mechanical properties. Moreover, different temperature peaks from 600 to 1000 degrees C denoting thermal decomposition of different calcium carbonate species were depic

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GA19-16646S" target="_blank" >GA19-16646S: The elimination of the negative impact of zinc in Portland cement by accelerating concrete admixtures</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

1588-2926

Volume of the periodical

138

Issue of the periodical within the volume

6

Country of publishing house

HU - HUNGARY

Number of pages

11

Pages from-to

4155-4165

UT code for WoS article

000501308800026

EID of the result in the Scopus database

2-s2.0-85069473140