Lime-based grouts for architectural surface repair. Comparison of their performance by using laboratory and field test methods

Author(s): Vasiliki Pachta, Ioanna Papayianni, Thomas Spyriliotis
Paper category: Proceedings
Book title: Proceedings of the 5th Historic Mortars Conference
Editor(s): José Ignacio Álvarez, José María Fernández, Íñigo Navarro, Adrián Durán, Rafael Sirera
ISBN: 978-2-35158-221-3
e-ISBN: 978-2-35158-222-0
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 1215-1224
Total Pages: 10
Language : English

Abstract: Lime-based grouts are usually applied for the consolidation and strengthening of historic masonries and architectural surfaces (renders, plasters, murals’ substrates). Regarding architectural surfaces’ repair, the selection and application of grouts, implies the implementation of a series of test methods. In the present study, three often used compositions of lime-based grouts, containing lime-pozzolan (L:P - 1:1 by mass), lime- pozzolan-white cement (L:P:WC - 1:0.8:0.2 by mass) and hydraulic lime NHL 3.5 were tested, by using laboratory and field test methods. The properties tested were fluidity, penetrability, volume stability and shrinkage tendency, as well as compressive and flexural strength of the grout mixtures at the age of 28, 90 and 180 days. The results from the laboratory and field tests were compared and found to be in agreement with the good performance of grouts. From the evaluation of the three types of grouts, it was concluded that all of them were acceptable, in relation to the LP performance at fresh and hardened state. The early strength (28d) was slightly higher in the composition with 10% WC and NHL3.5, but the long-term one (180d) was highest in the LP composition. Field tests seemed to be indicative of the good performance of grouts.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00