TY  - JOUR
A1  - Müller, Constanze
A1  - Seher, Julia
A1  - Pniok, Nicole
A1  - Dreisow, Bianca
A1  - Rübner, Katrin
T1  - Formulation and characterization of repair mortars for sandstone with lightweight aggregates made from masonry rubble
JF  - Construction and Building Materials
N2  - This paper deals with the study of different lime-based repair mortars for the conservation of sandstone objects in the context of monument preservation. New types of lightweight aggregates, which were manufactured from masonry rubble, were used to develop these repair mortars. This allows for recycling of construction and demolition waste while helping to conserve natural resources. As part of this work, the mortars were comprehensively characterised in terms of their chemical, physical, mechanical and hygric properties, such as bulk density, pore structure, strength, water absorption, shrinkage and carbonation. All mortars are lightweight mortars with bulk densities of about 1300 kg/m³. They achieve high porosities of around 50 %. At the same time, the mortars exhibit sufficient compressive strengths ranging from 1.8 to 11.3 MPa. The compressive strength depends on the degree of carbonation of the mortars and increases with sample age. The analysis of the pore structure shows that the mortars mainly contain macropores. The large number of capillary pores, with sizes ranging from 0.1 to 1000 μm, results in a good water absorption behaviour. The evaluation of the results proves that the repair mortars are compatible with Cotta sandstone.
KW  - Repair mortar
KW  - Lime mortar
KW  - Lightweight aggregates
KW  - Sandstone
KW  - Stone conservation
KW  - Recycling
PY  - 2025
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:b43-647431
DO  - https://doi.org/10.1016/j.conbuildmat.2025.143378
SN  - 0950-0618
VL  - 494
SP  - 1
EP  - 9
PB  - Elsevier Ltd.
AN  - OPUS4-64743
LA  - eng
AD  - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER  -