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首页> 美国卫生研究院文献>Materials >Determination of Mortar Strength in Historical Brick Masonry Using the Penetrometer Test and Double Punch Test
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Determination of Mortar Strength in Historical Brick Masonry Using the Penetrometer Test and Double Punch Test

机译：用渗透仪试验和双冲孔试验确定历史砖砌体的砂浆强度。

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This paper presents the results of the minor destructive testing of mortars in masonry structures of four buildings erected at the turn of the 19th and 20th centuries. The buildings were erected in the historical centre of Cracow. The objective of testing was to determine mortar compressive strength in masonry joints. The in situ tests were carried out with the use of a penetrometer RSM-15 with the standardised impact energy equalling 4.55 nm. Laboratory tests on mortar specimens taken from the structures were also performed. The double punch test method was used in the laboratory tests. On account of the specificity of the tested historical mortars, the typical procedures used in penetrometer and double punch tests were modified. For penetrometer tests, a new feature called “a surface disturbance zone” was introduced. Additionally, a procedure for determining a surface disturbance zone range was included. As confirmed in the paper, the consideration of the surface disturbance zone in the analysis of test results is crucial for the correct evaluation of mortar compressive strength. The thicknesses of bed joints in the tested historical masonry considerably exceeded the requirements included in the standard EN 1996-1-1. Thus, the thickness of the mortar specimens taken from historical masonry for the double punch tests clearly exceeded the thickness of specimens extracted from the typical structures erected nowadays. This article provides a method of considering a specimen thickness parameter in the analysis of double punch test results. The in situ test results with the use of penetrometer and double punch methods confirmed that the mortar strength in tested historical buildings ranged from 1.4 to 2.9 MPa. Mortar compressive strength values determined by both applied methods were similar.
机译：本文介绍了在19世纪和20世纪之交竖起的4座建筑物的砖石结构中的灰浆进行的较小破坏性测试的结果。这些建筑物竖立在克拉科夫的历史中心。测试的目的是确定砌筑缝中的砂浆抗压强度。使用渗透仪RSM-15进行原位测试，其标准冲击能量等于4.55 nm。还对从结构中取出的砂浆标本进行了实验室测试。在实验室测试中使用了双打孔测试方法。考虑到所测试的历史迫击炮的特殊性，对渗透计和双冲头测试中使用的典型程序进行了修改。对于渗透计测试，引入了一个称为“表面扰动区”的新功能。另外，包括确定表面扰动区范围的程序。正如本文所证实的那样，在测试结果分析中考虑表面扰动区对于正确评估砂浆抗压强度至关重要。经过测试的历史砌体中的床缝厚度大大超过了标准EN 1996-1-1中的要求。因此，从历史砌体中进行的双冲孔试验得到的灰浆样本的厚度明显超过了从当今竖立的典型结构中提取的样本的厚度。本文提供了一种在双冲头测试结果分析中考虑样品厚度参数的方法。使用针入度计和双冲头方法进行的现场测试结果证实，在测试过的历史建筑中，砂浆强度为1.4至2.9 MPa。通过两种应用方法确定的砂浆抗压强度值相似。

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