The role of alkalis in hydraulic mixtures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27120%2F19%3A10242599" target="_blank" >RIV/61989100:27120/19:10242599 - isvavai.cz</a>

Result on the web

<a href="https://www.scientific.net/MSF.955.62" target="_blank" >https://www.scientific.net/MSF.955.62</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/MSF.955.62" target="_blank" >10.4028/www.scientific.net/MSF.955.62</a>

Result language

angličtina

Original language name

The role of alkalis in hydraulic mixtures

Original language description

Alkali substances are present in cements used as a binder in concrete only in a minimum content. The most known process that alkali causes is the alkali-silica reaction. In this reaction, the alkali contained in the cement or supplied from the outside with an inappropriately selected aggregate containing amorphous SiO2. The most known process that alkali causes is the alkali-silica reaction. In this reaction, the alkali contained in the cement or supplied from the outside with an inappropriately selected aggregate containing amorphous SiO2 results in the development of hydration products of an increase in the volume of the original components, which can cause a breakage of the concrete structure and subsequent disintegration. The range of alkali-silica reaction can be reduced by the use of a suitable aggregate or the use of Type II admixtures which are characterized by pozzolanic or latently hydraulic activity. These admixtures react with alkali and then no longer react with the amorphous SiO2 contained in the aggregate. Alkalis also affect other properties of concrete such as basic physical-mechanical properties, frost resistance and pH. In the experimental part the pH values were compared between mixtures of Portland cement and alkaline activated blast furnace slag using slag aggregate from the heap Koněv. (C) 2019 Trans Tech Publications Ltd, Switzerland.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20500 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

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

Article name in the collection

Materials Science Forum. Volume 955

ISBN

978-3-0357-1444-9

ISSN

0255-5476

e-ISSN

—

Number of pages

6

Pages from-to

62-67

Publisher name

Trans Tech Publications

Place of publication

Curych

Event location

Brno

Event date

Sep 12, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—