Drying Shrinkage of Historic Portland Cements: Factors to be Considered for Successful Repair

Author(s): Simeon Wilkie, Thomas Dyer
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: 862-876
Total Pages: 15
Language : English

Abstract: Drying shrinkage of building materials containing Portland cement is a key concern in their conservation. While drying shrinkage can lead to cracking of hardened cementitious materials, it is also an important consideration for repair materials, as failure to match the shrinkage of the original and new materials can result in a repair that is poor. However, this is a complicated issue, as changes in manufacturing technology and processes, available raw materials, and the introduction and development of material standards, have all had an
effect on the physical and chemical properties of cementitious building materials. As such, historic materials vary considerably from those that are manufactured today, and there is limited understanding of how to address drying shrinkage. In order to better understand this issue, a study of the reversible drying shrinkage of materials containing historic Portland cements, taken from structures in-situ, was undertaken. Statistical analyses of the results were then performed in order to determine which physical and chemical properties have the most influence on drying shrinkage, and the implications posed for the conservation of historically-significant structures.

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