The Development of a New Chemically Resistant Sprayed Mixture

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F22%3APU147040" target="_blank" >RIV/00216305:26110/22:PU147040 - isvavai.cz</a>

Result on the web

<a href="https://www.scientific.net/SSP.336.185" target="_blank" >https://www.scientific.net/SSP.336.185</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/p-248gp8" target="_blank" >10.4028/p-248gp8</a>

Result language

angličtina

Original language name

The Development of a New Chemically Resistant Sprayed Mixture

Original language description

This paper deals with research and development of a new chemically resistant sprayed mixture based on portland cement and special admixtures. The new material will be part of a comprehensive remediation system for the remediation of chemically attacked and stressed sewer structures. The aim of this work is to verify the effect of the amount of crystalline waterproofing admixture on selected physical-mechanical characteristics and chemical resistance, specifically resistance to the attack of sulphate solution and the attack of aggressive biogenic sulfuric acid solution. Furthermore, the resulting characteristics of test specimens manufactured in the laboratory and test specimens made by spraying into boxes and subsequent cutting to the required dimensions were compared. Due to the fact that there is currently no official methodology in the Czech Republic for testing the chemical resistance of cementitious materials intended for sewage environments, the methodology was used in accordance with DIN 19573 "Draft on mortars for construction and rehabilitation sewer systems". The sulphate resistance was determined for test specimens measuring 160×40×10mm, which were exposed to a solution of sulphate salts with a concentration of 29.8g / l (44g/l Na2SO4) for 91days. To determinate the resistance to biogenic sulfuric acid, special tanks were assembled in which the test specimens, measuring 80×40×40mm, were exposed for 14 days to a solution of sulfuric acid (H2SO4) with a molar concentration of 1,0mol/l (pH=0). The results of this work show the optimal amount of crystalline waterproofing admixture. The results of this work will be used in the next phase of research, when cement and some fillers will be substituted by selected secondary raw materials, namely to improve or at least maintain the key characteristics of the final sprayed mixture.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/FV20149" target="_blank" >FV20149: Unified system for remediation of chemically attacked and exerted building constructions</a><br>

Continuities

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

Publication year

2022

Confidentiality

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

Article name in the collection

28th Concrete Days

ISBN

978-3-0357-1725-9

ISSN

1012-0394

e-ISSN

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Number of pages

7

Pages from-to

185-191

Publisher name

Neuveden

Place of publication

neuveden

Event location

Praha

Event date

May 19, 2022

Type of event by nationality

CST - Celostátní akce

UT code for WoS article

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