Rheological behaviour of hydraulic lime-based grouts. Shear-time and temperature dependence

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• 作者：Ana Bras (1)
  Fernando M. A. Henriques (2)
  M. T. Cidade (2)
  
• 关键词：Hydraulic lime grout ; Structuration rate ; Temperature ; Fly ash ; Thixotropy
• 刊名：Mechanics of Time-Dependent Materials
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：17
• 期：2
• 页码：223-242
• 全文大小：1249KB
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• 作者单位：Ana Bras (1)
  Fernando M. A. Henriques (2)
  M. T. Cidade (2)
  
  1. ESTBarreiro/IPS, Polytechnic Institute of Setúbal, 2839-001, Lavradio, Portugal
  2. Department of Civil Engineering, NOVA University of Lisbon, 2829-516, Caparica, Portugal
  
• ISSN：1573-2738

文摘

This paper deals with the coupled effect of temperature and fly ash (FA) addition on rheological behaviour of natural hydraulic lime (NHL5) based grouts, currently used in masonry consolidation. The use of a grout injection technique for masonry consolidation may lead to an increase of hydrostatic pressure and lead to structural damage. This means that the thixotropic effects become self-evident in grout design. It was shown that there is a relation between the structuration rate of each grout and the pressure that occurs inside masonry during its consolidation. According to the results, it seems also that there is a grout threshold temperature (T limit) that separates a domain where the grout build-up structure area is almost constant, from another where flocculation area starts to increase significantly. We believe that in the first region the thixotropic effects are almost isolated from the irreversible effects (due to hydration). For the NHL5 based grout T limit=20 °C and for the grout with NHL5+15 % of FA T limit=15 °C. Grouts-characterization based on maximum resisting time, structuration rate and on the analysis of the hydraulic lime grout behaviour tested at different shear rates was performed using a shear thinning model and assuming that the structure is shear- and time-dependent. The goal is to use this methodology during mix proportioning and design for masonry injection purpose. The tested grout compositions were optimized compositions obtained in previous research using the design of experiments method.