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Assessing the Impact of Aggregate Type on Air Lime Mortar Properties Using Scanning Electron Microscopy

Journal of Civil Engineering and Architecture 2016年第2期10卷 139-147页

作者： Sarah Scannell Mike Lawrence and Pete Walker Building Research Establishment Centre for Innovative Construction Materials Department of Architecture and Civil EngineeringUniversity of Bath Bath BA2 7AY UK

In recent years, the need for low energy materials has become increasingly important. With government targets aiming to reduce carbon emissions by 80% by 2050, and the construction industry being responsible for 50% of the UK＇s carbon emissions, it is of vital importance that positive changes are made. One of these changes is to reduce the carbon footprint of the materials used in construction. Lime mortar has been used for centuries, but since the arrival of cement, its use in modern construction has diminished, in part due to having lower compressive strengths than cement mortar. Air lime mortar, in particular, can be categorised as low energy due to the reabsorption of a significant amount of COE during the setting process： carbonation. The current study focuses on the impact of different types of aggregate （limestone and silicate） on air lime mortar strength. Previous research has found that higher strengths can be achieved with the use of limestone aggregate, but little is known about the reasons why. The research presented here looks at a microstructural analysis through use of SEM （scanning electron microscopy） in order to determine reasons behind the strength differences. At early stages of curing, there are clear differences at the interface of binder and aggregate.

关键词： Air lime limestone silicate aggregate scanning electron microscopy carbonation.

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