NMR spectroscopy-supported design and properties of air lime-white cement injection grouts for strengthening of historical masonry buildings

摘要

We present design and properties of combined air lime-white cement structural injection grouts containing 17.5% of air lime, 7.5% of cement and 75% of limestone filler, using white Portland cement. Time evolution of the grout setting process during hydration from early to late stages was monitored by NMR spectroscopy and compared to pure cement-paste control samples. The grout setting is significantly slowed down (by more than 10 days). The compressive strengths of the grouts were found in the range 1.5-2.5 MPa, making them efficient materials for the strengthening of historical masonry buildings in Slovenia. (C) 2020 Elsevier Ltd. All rights reserved.