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Assessment of Laboratory and Field Testing Methods in Lime-based Grouts for the Consolidation of Architectural Surfaces
International Journal of Architectural Heritage ( IF 2.3 ) Pub Date : 2020-02-22 , DOI: 10.1080/15583058.2020.1731629
Vasiliki Pachta 1 , Ioanna Papayianni 1 , Thomas Spyriliotis 1
Affiliation  

Lime-based grouts are usually applied for the consolidation and strengthening of historic structures. In the case of architectural surfaces (renders, plasters, murals, wall mosaics), the testing procedure of grouts may concern laboratory (according to relevant standards) and field test methods (simple tests without specialized instrumentation that can be easily applied on-site). In the present study, three often used compositions of lime-based grouts were manufactured and tested, regarding lime-pozzolan (L:P – 1:1 by mass), lime-pozzolan-white cement (L:P:C – 1:0.8:0.2 by mass) and natural hydraulic lime (NHL 3.5). The methodology applied concerned the assessment of laboratory and field test methods as defined by literature and relevant standards. At fresh state, the properties measured were fluidity, penetrability and volume stability, recorded both with the laboratory and field testing tools. At hardened state, shrinkage tendency was determined, as well as the mechanical characteristics of the specimens at the age of 28, 90 and 180 days (Dynamic Modulus of Elasticity, Flexural, Compressive strength). From the evaluation of the results, it was concluded that the laboratory and field test values were in agreement, providing valuable information for the grouts’ performance. All compositions presented acceptable results, while their mechanical characteristics were significantly enhanced up to the age of 180 days. The early strength development (28d) of the mixtures seemed to be favoured by the addition of 10% w/w of white cement in the lime:pozzolan matrix.



中文翻译:

石灰基水泥浆用于建筑表面加固的实验室和现场测试方法的评估

石灰基灌浆通常用于巩固和加强历史建筑。对于建筑表面(浇筑物,灰泥,壁画,墙壁马赛克),灌浆的测试程序可能涉及实验室(根据相关标准)和现场测试方法(简单的测试而无需专门的仪器,可以很容易地在现场应用) 。在本研究中,制造和测试了三种常用的石灰基灌浆成分,分别是石灰-火山灰(L:P – 1:1质量比),石灰-火山灰-白水泥(L:P:C – 1: 0.8:0.2质量)和天然水硬石灰(NHL 3.5)。所采用的方法涉及文献和相关标准所定义的实验室和现场测试方法的评估。在新鲜状态下,测得的性能为流动性,渗透性和体积稳定性,使用实验室和现场测试工具进行记录。在硬化状态下,测定了收缩趋势,以及在28、90和180天龄时的样品力学特性(弹性,弯曲,抗压强度的动态模量)。通过对结果的评估,可以得出结论,实验室和现场测试值是一致的,为灌浆性能提供了有价值的信息。所有组合物均表现出可接受的结果,而其机械特性直至180天的年龄都得到了显着提高。在石灰:火山灰基质中添加10%w / w的白水泥似乎有利于混合物的早期强度发展(28d)。以及28、90和180天龄时的样品力学特性(弹性,弯曲,抗压强度的动态模量)。通过对结果的评估,可以得出结论,实验室和现场测试值是一致的,为灌浆的性能提供了有价值的信息。所有组合物均表现出可接受的结果,而其机械特性直至180天的年龄都得到了显着提高。在石灰:火山灰基质中添加10%w / w的白水泥似乎有利于混合物的早期强度发展(28d)。以及28、90和180天龄时的样品力学特性(弹性,弯曲,抗压强度的动态模量)。通过对结果的评估,可以得出结论,实验室和现场测试值是一致的,为灌浆性能提供了有价值的信息。所有组合物均表现出可接受的结果,而其机械特性直至180天的年龄都得到了显着提高。在石灰:火山灰基质中添加10%w / w的白水泥似乎有利于混合物的早期强度发展(28d)。结论是实验室和现场测试值一致,为灌浆性能提供了有价值的信息。所有组合物均表现出可接受的结果,而其机械特性直至180天的年龄都得到了显着提高。在石灰:火山灰基质中添加10%w / w的白水泥似乎有利于混合物的早期强度发展(28d)。结论是实验室和现场测试值一致,为灌浆性能提供了有价值的信息。所有组合物均表现出可接受的结果,而其机械特性直至180天的年龄都得到了显着提高。在石灰:火山灰基质中添加10%w / w的白水泥似乎有利于混合物的早期强度发展(28d)。

更新日期:2020-02-22
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