Effect of ultralight filler on the properties of hydrated lime injection grout for the consolidation of detached historic decorative plasters

Padovnik, Andreja (author), Bokan-Bosiljkov, Violeta (author)

Injection-grout density is an important parameter when its additional weight leads to consolidated decorative plasters becoming damaged. This is especially evident in larger detached areas. In this study, thin-walled soda–lime–borosilicate glass microspheres were used as a density-reducing constituent in hydrated lime grout mixtures. The normal density grout composition—one volume part hydrated lime and three volume parts inert limestone filler with 0.5% of the polycarboxylate ether-based superplasticiser—was modified with partial substitution of the limestone filler with lightweight glass microspheres. The following volumetric proportions between limestone filler and glass microspheres were used: 100%:0%, 67%:33%, 50%:50%, 33%:67%, and 0%:100%. With the increase of the glass microspheres’ volume, the density of the grout is gradually reduced. Furthermore, there is a decrease in the stability and injectability of fresh grout. In its hardened state, the grout’s strength again reduces gradually, but there is no significant change in the grout’s water absorption and water-vapour resistance. The resistance of the grout to freezing–thawing and heating–cooling cycles using distilled water or salt solution is highly improved when the microspheres are present.

• Language: English
• Keywords: detached decorative plasters, injection grout, glass microspheres, reduced density, stability, strength, durability
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2020
• Number of pages: 19 str.
• Numbering: Vol. 13, iss. 15, art. 3360
• PID: 20.500.12556/RUL-120993
• UDC: 620.1(045)
• ISSN on article: 1996-1944
• DOI: 10.3390/ma13153360
• COBISS.SI-ID: 24005379
• Publication date in RUL: 28.09.2020

Record is a part of a journal

• Title: Materials
• Shortened title: Materials
• Publisher: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 01.08.2020

Secondary language

• Language: Slovenian
• Keywords: odstopljeni dekorativni ometi, injekcijska mešanica, steklene mikrosfere, zmanjšana gostota, stabilnost, trdnost, obstojnost