Estimation of Mortar Compressive Strength Based on Specimens Extracted from Masonry Bed Joints

Łątka, Dawid; Seręga, Szymon; Matysek, Piotr

doi:10.1007/978-3-319-99441-3_62

Cited by 6 publications

(7 citation statements)

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“…Less popular are high-precision measuring techniques used only in case of uneven settling or extreme cases (excessive deflections of slabs). If necessary, core samples are taken from walls or structural parts for precise determination of concrete strength [9][10][11][12][13][14]. Furthermore, 3D FEM models can be applied for the prediction of the causes of the existing state (possible cracking).…”

Section: Introductionmentioning

confidence: 99%

Use of TLS (LiDAR) for Building Diagnostics with the Example of a Historic Building in Karlino

2020

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This article presents the use of TLS (LiDAR) measurement for the evaluation of the technical conditions of a historic building. A FARO M70 laser scanner was used in the study. The measurements was taken as an RCP point cloud. The measurement allowed to partially determine the cause of the building damage. The performed measurement allows to propose a precise solution that could be pre-fabricated. The study shows the usefulness of TLS in building diagnostics. Improper measurement could lead to a wrong solution and a certain degree of uncertainty.

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Section: Introductionmentioning

confidence: 99%

Use of TLS (LiDAR) for Building Diagnostics with the Example of a Historic Building in Karlino

2020

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“…By analyzing statistical parameters of all results presented in this paper and obtained by other authors [ 3 , 5 , 19 , 20 , 22 , 28 , 35 , 41 , 44 , 45 , 46 , 50 , 51 , 58 , 60 , 61 ], a significant difference between minor destructive tests (DPT, PT, TPT) and the destructive test is noticeable. For dispersion assessment, variation coefficients were compared in Figure 22 .…”

Section: Discussionmentioning

confidence: 71%

“…Moreover, the results of the PT tests (dashed line) and the tests performed on reference beam samples (solid line) provided the lowest strengths ( f m for mortars H and F, and f m.PT for mortar G). Significantly higher values of f m.DPT result from a few factors, among which the most important are the following: Specimen confinement (the effect of friction at the specimen—punch contact zone; a specimen area larger than the load area; the presence of a capping) [ 16 , 20 , 47 , 49 , 50 ]. Specimen small dimensions and slenderness (the ratio of specimen thickness to punch diameter) [ 8 , 16 , 17 , 22 , 26 , 51 ].…”

Section: Discussionmentioning

confidence: 99%

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Prediction of Mortar Compressive Strength Based on Modern Minor-Destructive Tests

Łątka

2023

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The crucial task of the diagnosis of an existing masonry structure is to assess the current values of the mechanical parameters of the materials from which the structure was erected—usually bricks and mortar. The article presents the results of minor-destructive tests carried out on bed joints of three-brick-masonry prisms prepared in the laboratory. Three types of mortars used in the masonry were tested, which differ by the type and amount of binder. In order to determine mortar compression strength, three modern diagnostic methods were used: double punch test (DPT), standard penetrometric test (PT) and torque penetrometric test (TPT). Tests were carried out after 4, 12 and 90 weeks. The mortar strength determined in each of these tests was compared with the mortar reference strength determined on the beam specimen according to the methodology given in EN 1015-11. The results of the conducted tests confirmed the high usefulness of all three diagnostic methods. However, limitations in the application of the PT test were noticed—only lime mortars and weak cement–lime mortars can be tested with this method. In the case of mortars with an increased amount of cement binder, the impact energy is too low to estimate the compressive strength of the mortar in the brick wall joint. Technical limitations in the use of TPT and DPT tests were also indicated—weak lime mortars with low cohesion do not allow for obtaining reliable results. It was shown that DPT results strongly depend on two factors, specimen slenderness and mortar strength. Due to this fact, simple non-parameter conversion from mortar compressive strength according to the DPT test into mortar reference strength may lead to significant overestimation. As the results show, in newly built masonry, proper selection of diagnostic method is crucial due to the strong dependence of mortar curing dynamics on its location in the joint. This paper helps to match diagnostic techniques with the condition and type of mortar in the existing structure.

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“…Therefore, in many diagnostic operations, core samples are taken, also containing a fragment of mortar and masonry elements adjacent on both sides. The core samples, after certain correlations, are used to determine the load-bearing capacity of the whole masonry structure [12][13][14][15][16][17]. Even more accurate results may be obtained by test-loading a masonry section with actuators [18].…”

Section: Introductionmentioning

confidence: 99%

Research and TLS (LiDAR) Construction Diagnostics of Clay Brick Masonry Arched Stairs

et al. 2022

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The study presents the terrestrial laser scanning (TLS) diagnostic of the clay brick masonry arched staircase in a historic building. Based on the measurements of the existing arched stair flights, 1:1 scale experimental models with and without stair treads were made. Strength tests of the models were carried out for different concentrated force locations in relation to the supporting structure. Force, deflections and reaction in the upper support of the run were measured during the tests. The influence of the masonry steps on the curved vault on the load capacity and stiffness of the run structure was analyzed. The conducted experimental investigations showed that the key element responsible for the actual load-bearing capacity and stiffness of this type of stair flights were the treads above the masonry arch.

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Estimation of Mortar Compressive Strength Based on Specimens Extracted from Masonry Bed Joints

Cited by 6 publications

References 6 publications

Use of TLS (LiDAR) for Building Diagnostics with the Example of a Historic Building in Karlino

Use of TLS (LiDAR) for Building Diagnostics with the Example of a Historic Building in Karlino

Prediction of Mortar Compressive Strength Based on Modern Minor-Destructive Tests

Research and TLS (LiDAR) Construction Diagnostics of Clay Brick Masonry Arched Stairs

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