Novel low energy high performance mortars for the construction industry

用于建筑行业的新型低能耗高性能砂浆

• 批准号: EP/D024242/1
• 负责人: Pete Walker
• 金额: $ 13.25万
• 依托单位: University of Bath
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD024242%2F1
• 关键词: Novel; low; energy; performance; mortars

Masonry construction, including both clay bricks and concrete blockwork, relies on 10 mm mortar joints to bond the units together. In the UK around 50 million m2 (wall area) of fired clay bricks and 60 million m2 of concrete blocks are produced every year, requiring around 1.5 billion litres of mortar. The functions of mortar in masonry construction are to provide an even bed between units, bond units together to provide flexural strength and seal joints against rain penetration. Increasingly the construction industry is realising that hydraulic lime mortars fulfil these requirements extremely well. One significant benefit of lime mortars, in comparison with more widely used cement mortars, is a 40% reduction in carbon dioxide emissions, a significant greenhouse gas.The proposed work is to develop low-energy high-performance mortars using a novel quicklime drying technique for the aggregates, the inclusion of admixtures with the mix and the extension of the binder phase to include pozzolanas and alternative low energy cements. This proposal aims to investigate and develop the use of quicklime addition to the fine aggregate as the means to dry the sand. The approach relies upon both the chemical combination of water to yield calcium hydroxide and the associated heat production. However, the amount of quicklime required will vary with sand moisture content and desired mortar mix. As the mortar mix designs become leaner (lower strength), increased quantities of quicklime will be required to dry the sand. The leanest mixes will require significant quantities of quicklime with an associated reduction in the hydraulic lime component. This will limit the potential engineering properties of the mortar unless modifications are made to its composition. The study will therefore investigate possible modifications, including the use of admixtures such as water reducers, pozzolanas, as well as more energetic hydraulic binders such as Roman cement. Current editions of the structural design codes for masonry do not include design data for lime mortared masonry. In combination with the development of low-energy mortars, the proposed work will seek to address this lack of data.The proposed research methodology comprises experimental investigation of dry mix low-energy mortars, including the study of efficiency of lime slaking to dry wet sand during the mixing process, micro-structural analysis of mortars, and investigation of low energy mortared masonry properties. Experimental studies will be supported by numerical analysis of masonry properties and comparative life cycle analysis of masonry. Research of sand drying and mortar properties will primarily be undertaken at the Universities of Bradford and Bristol, whilst experimental and numerical investigation of masonry properties and life cycle analysis will primarily be completed at the University of Bath. The current proposal extends previous work in two important areas: firstly it will extend the range of available low energy mortars; and, secondly, the proposed work will examine the performance of these limes in structural masonry so that engineers, architects and builders can use the material with confidence.

砌体结构，包括粘土砖和混凝土砌块，依靠10毫米砂浆接缝将单元粘合在一起。在英国，每年生产约5000万平方米（墙体面积）的烧结粘土砖和6000万平方米的混凝土砌块，需要约15亿升砂浆。砂浆在砌体结构中的作用是在单元之间提供均匀的垫层，将单元粘合在一起以提供抗弯强度并密封接缝以防止雨水渗透。建筑行业越来越意识到水硬性石灰砂浆能够非常好地满足这些要求。与更广泛使用的水泥砂浆相比，石灰砂浆的一个显著优点是减少了40%的二氧化碳排放量，这是一种重要的温室气体。拟议的工作是开发低能量高性能砂浆，使用新的生石灰干燥技术的骨料，包括混合物和粘合剂相的扩展，包括火山灰和替代的低能量水泥。本提案旨在研究和开发在细骨料中添加生石灰作为干砂的方法。该方法依赖于水的化学结合以产生氢氧化钙和相关的热产生。然而，所需生石灰的量将随砂的含水量和所需的砂浆混合物而变化。随着砂浆混合设计变得更稀（强度更低），需要增加生石灰的数量来干燥沙子。最贫的混合料将需要大量的生石灰，同时减少水硬性石灰成分。除非对其成分进行修改，否则这将限制砂浆的潜在工程性能。因此，该研究将调查可能的修改，包括使用减水剂，火山灰等外加剂，以及更有活力的水硬性粘合剂，如罗马水泥。当前版本的砌体结构设计规范不包括石灰砂浆砌体的设计数据。结合低能量砂浆的发展，拟议的工作将寻求解决这一数据的缺乏，拟议的研究方法包括干混低能量砂浆的实验研究，包括石灰消化的效率，在搅拌过程中的干湿砂的研究，砂浆的微观结构分析，并调查低能量砂浆砌体性能。实验研究将得到砌体性能的数值分析和砌体的比较生命周期分析的支持。沙子干燥和砂浆性能的研究将主要在布拉德福德大学和布里斯托大学进行，而砌体性能和生命周期分析的实验和数值研究将主要在巴斯大学完成。目前的提案在两个重要领域扩展了以前的工作：首先，它将扩大可用的低能量砂浆的范围;其次，拟议的工作将检查这些石灰在结构砌体中的性能，以便工程师，建筑师和建筑商可以放心地使用这种材料。

项目成果

Historic Mortars

历史迫击炮

• DOI: 10.1007/978-94-007-4635-0_29
• 发表时间: 2012
• 作者: Lawrence M

Flexural bond strength development of brickwork using natural hydraulic lime (NHL) mortar

使用天然水硬石灰 (NHL) 砂浆开发砖砌体的弯曲粘结强度

• 发表时间: 2008
• 作者: N/a Zhou

Influence of materials on mortar and bond strength of hydraulic lime mortared brickwork

材料对水硬石灰浆砖砌体砂浆及粘结强度的影响

• 发表时间: 2008
• 作者: N/a Zhou

Strength characteristics of hydraulic lime mortared brickwork

水硬性石灰砂浆砖砌体的强度特性

• DOI: 10.1680/coma.2008.161.4.139
• 发表时间: 2008
• 期刊: Proceedings of the Institution of Civil Engineers - Construction Materials
• 作者: Zhou Z