Compressive strength, dynamic, and static modulus of cement-lime laying mortars obtained from samples of various geometries

Nalon, Gustavo Henrique; Alves, Marcelo Arruda; Pedroti, Leonardo Gonçalves; Ribeiro, José Carlos Lopes; Fernandes, Wellington; Oliveira, Diego Sales de

doi:10.1016/j.jobe.2021.102626

Cited by 12 publications

(12 citation statements)

References 43 publications

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“…In the case of the modulus of elasticity, its value significantly depends on the strength, as evidenced by the linear regression with a high correlation R = 0.95 ( Figure 11 ). Similar results of relation between compressive strength and dynamic elasticity modulus were obtained by [ 52 ].…”

Section: Resultssupporting

confidence: 88%

Comparative Study of Effects of Air-Entraining Plasticizing Admixture and Lime on Physical and Mechanical Properties of Masonry Mortars and Plasters

Gołaszewska¹,

Gołaszewski²,

Bochen³

et al. 2022

Materials

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This article presents research on selected physical and mechanical properties of cement-based plasters and masonry mortars with consistency-improving additives, namely, traditional hydrated lime and a plasticizing and aerating mixture (APA), which, in practice, is often considered to be a lime substitute. Comparative analysis of the properties of mortars with alternative additives—lime or APA—was carried out, taking into consideration possible effects of cement, as two types of Portland cement were used for the research. For fresh mortar, mixture consistency, air content, resistance to segregation, and water retention were determined. Tests on hardened mortars included tests of porosity and impermeability, depth of penetration of water under pressure, drying shrinkage, as well as compressive and bending strength, modulus of elasticity, and adhesion of mortars to the base. In addition, research has shown that cement–lime mortars and cement mortars with APA admixture of similar consistency in the fresh state are characterized by significantly different properties. The results show, in most of the features analyzed, more favorable properties of mortars with the use of traditional lime. For shrinkage only, the use of admixture turned out to be more advantageous.

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Section: Resultssupporting

confidence: 88%

Comparative Study of Effects of Air-Entraining Plasticizing Admixture and Lime on Physical and Mechanical Properties of Masonry Mortars and Plasters

Gołaszewska¹,

Gołaszewski²,

Bochen³

et al. 2022

Materials

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“…The mean value of CV changed from 3% to 12% for f m , from 11% to 15% for f m.DPT , from 12% to 26% for f m.PT , and from 28% to 58% for f m.TPT . This agrees with the conclusion that more homogenous mortars tend to be stronger [ 58 ]. Those two features suggest that in the case of low-strength mortar diagnostic with PT or TPT, a larger number of tests is needed for the same accuracy of estimation.…”

Section: Discussionsupporting

confidence: 92%

“…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%

“…The minor-destructive test on the mortar in the existing structure is frequently performed in order to use the results obtained for determining the masonry compressive strength [ 55 , 56 , 57 ]. In such a case, it is often necessary to convert the estimated mortar strength obtained in the MDT test to the mortar compressive strength determined on half-beam specimens 4 × 4 × 8 cm 3 [ 58 ]. The values of the conversion coefficients obtained in the tests for the respective MDTs in the time function are presented in Figure 18 .…”

Section: Discussionmentioning

confidence: 99%

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

Łątka

2023

Materials

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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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“…The relationship between compressive strength and modulus of elasticity has been analysed in many studies [43][44][45] and is also presented in several standards. However, the importance of the mathematical use of correlation and regression analysis has been little appreciated because it has not always been possible to obtain the necessary data.…”

Section: Discussionmentioning

confidence: 99%

Relationship of Time-Dependent Parameters from Destructive and Non-Destructive Tests of Structural Concrete

Lehner

Hrabová

2022

Mathematics

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Reinforced concrete structures are typically exposed to a combination of aggressive substances and mechanical stresses, which contribute to fast degradation. The present research was conducted to evaluate five time-dependent parameters from several different tests, namely compressive strength, static modulus, dynamic modulus, surface, and bulk electrical resistance. Some parameters were obtained using destructive testing (DT) and some using non-destructive testing (NDT). Due to the correlation and calculation of regression curves, it was possible to compare the correlation of parameters important for estimating the durability of reinforced concrete structures in relation to degradation and corrosion. Concrete of C40/50 grade was examined in several time periods, and the parameter relationships were analysed. At the same time, a statistical evaluation was carried out, and therefore the study contains the average values and standard deviations of all measured parameters. The results show that the compressive strength and the electrical resistivity of the surface and bulk have a high correlation. In contrast, the dynamic modulus and electrical resistivity have low linear correlation, but it was possible to apply a quadratic curve with a high degree of fit. For the comparison of static elastic modulus and electrical resistance, the quality of the quadratic regression model was low but sufficient. The results show that, for structural concrete, the presented NDT methods can be used to estimate other parameters obtained from the DT methods.

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Compressive strength, dynamic, and static modulus of cement-lime laying mortars obtained from samples of various geometries

Cited by 12 publications

References 43 publications

Comparative Study of Effects of Air-Entraining Plasticizing Admixture and Lime on Physical and Mechanical Properties of Masonry Mortars and Plasters

Comparative Study of Effects of Air-Entraining Plasticizing Admixture and Lime on Physical and Mechanical Properties of Masonry Mortars and Plasters

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

Relationship of Time-Dependent Parameters from Destructive and Non-Destructive Tests of Structural Concrete

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