Effects of coarse aggregates on the mechanical properties, durability and microscopic behaviour of mortar rubble

Dong, Jie; Li, Zhaoqi; Yan, Xin; Liu, Yang; Zhao, Shi-rong; Ren, Qiushi; Zheng, Ying-hao; Jiang, Tao

doi:10.1016/j.conbuildmat.2022.129187

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…Fracture toughness plays a key role in the study of the dynamic fracture resistance of the mortar-rock interface and can control the stress intensity factor. According to the dynamic fracture mechanics of an interface, the origin of the polar coordinates is set at the interface joint of the mortar-rock bimaterial, as shown in Figure 1, and the crack tip equation of the mortar-rock bimaterial is solved by elastic mechanics, as shown in Equation (1).…”

Section: Dynamic Fracture Theory Of Interfacesmentioning

confidence: 99%

“…With the development of bridge construction in China, the number of large-span bridges built in mountainous areas is increasing. Mortar-rubble retaining slopes are often used in tapered slope support projects at the ends of bridges in mountainous areas [1]. As a mortar-aggregate masonry retaining wall, the mortar-rubble protection structure is vulnerable to the effects of impact caused by falling rocks, rock bursts or blasting.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Dynamic Fracture Characteristics of Mortar–Rock Interface Zones with Different Interface Inclinations and Shapes

Dong

Jiang

et al. 2023

Materials

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There has been little research on the impact resistance of mortar–rock slope protection structures. To ensure that the mortar–rock interface has good adhesion properties under the action of impact loading, in this paper, based on fracture mechanics theory, a theoretical impact model was established for mortar–rock binary material. Dynamic fracture tests were carried out on mortar–rock interfaces using the split-Hopkinson pressure bar (SHPB) system. The Brazilian disc (CSTBD) specimen was prepared with one half in granite and the other half in mortar. The specimen used for the dynamic impact test was 48 mm in diameter and 25 mm thick. The effects caused by the change in interface inclination and interface shape on the dynamic fracture mode were discussed. The dynamic model parameters were obtained for different inclination angles and interfaces. The results show that both the interface inclination and interface shape have significant effects on the dynamic mechanical properties of the mortar–rock binary material. The fracture modes of the mortar–rock specimens can be classified into three types. When the interface inclination is 0°, the specimen shows shear damage with an interface fracture; when the interface inclination is in the range of 0–90°, the dynamic splitting strength of the mortar–rock material increases with increasing interface inclination, and the interface undergoes composite fracture; and when the interface inclination is 90°, the dynamic splitting strength of the specimen reaches its peak, and the interface undergoes tensile fracture. The mortar–rock interface damage follows the M-C criterion. The roughness of the interface shape has a large influence on the dynamic splitting strength of the specimens. The rougher the interface shape, the higher the interface cleavage strength and the higher the peak load that causes the material to damage. The results of this study can provide a reference for the design of mortar–rubble structures to meet the demand for impact resistance and have strong engineering application value.

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Section: Dynamic Fracture Theory Of Interfacesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Dynamic Fracture Characteristics of Mortar–Rock Interface Zones with Different Interface Inclinations and Shapes

Dong

Jiang

et al. 2023

Materials

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“…Slurry masonry schist, a combination of schist and mortar, is different from ordinary concrete. The aggregate size of slurry masonry schist is usually greater than 150 mm [11], and the proportion of aggregate is greater than 70%. Consequently, the fracture properties of slurry masonry schist diverge from those of ordinary concrete.…”

Section: Introductionmentioning

confidence: 99%

Examination of Damage Evolution in Slurry Masonry Schist Subjected to Biaxial Compressive Stresses

Dong,

Cheng,

Chen

et al. 2024

Buildings

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This study used a static bidirectional multifunctional loading system. The system conducted bidirectional compression tests on scaled specimens of slurry masonry schist under freeze–thaw cycling conditions. This study aimed to investigate the influence of bidirectional stress coupling with freeze–thaw cycles on the mechanical properties of slurry masonry schist. The results indicate that lateral pressure can increase the peak stress of slurry masonry schist, while freeze–thaw cycles have an adverse effect on the material’s internal pore structure, counteracting the gain effect of lateral pressure. This study also employed acoustic emission (AE) technology to analyze the evolution of slurry masonry schist failure characteristics. The findings reveal that freeze–thaw cycles accelerate the failure of slurry masonry schist during loading, and lateral pressure to some extent mitigates the damage development of slurry masonry schist. The synergistic effect of lateral pressure and freeze–thaw cycles alters the fracture mode of slurry masonry schist. Acoustic emission signal localization demonstrates numerous AE localization points in the interface transition zone, forming a coherent signal band where cracks propagate toward complete interface penetration. The crack extension process of the slurry masonry schist was investigated using the digital image correlation (DIC) method. The results indicated that macroscopic cracks formed in the strain localization zone, resulting in fracture damage to the specimens, with interfacial debonding identified as the primary failure mode for slurry masonry schist structures.

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“…The important parameters that most affect the strength of hardened concrete are types of coarse aggregate, the amount and types of cement, w/c, additives, and curing conditions (Aitcin & Mehda, 1990;Ezeldin & Aitcin, 1991;Zhou, Lydon, & Barr, 1995;de Larrard & Belloc, 1997;Özturan & Çeçen, 1997;Wu et al, 2001;Mannan et al, 2002;Beshr, Almusallam & Maslehuddin, 2003;Chi et al, 2003;Kılıç et al, 2008;Aminur et al, 2010;Meddah, Zitouni & Belâabes, 2010;Ahmad & Alghamdi, 2012;Uysal, 2012;Abdullahi, 2012;Kılıç & Sertabipoğlu, 2015;Vishalakshi, Revathi & Reddy, 2018;Kılıç et al, 2019;Góra & Piasta, 2020;Tunc & Alyamac, 2020;Karaman & Bakhytzhan, 2020;Góra & Szafraniec, 2020;Wu et al, 2020;Dong et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Statistical investigation of the effects of different origin aggre-gate properties on the mechanical properties of concrete

Teymen

2023

rdlc

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Aggregates are one of the most important components of the concrete mix and the aggregate properties have a great influence on the properties of the hardened concrete. From this point of view, the contribution of the nature of the aggregate to the general mechanical behavior of concrete should be better understood and investigated. The main purpose of this study is to present practical and useful equations for the rapid evaluation of the basic properties of concrete, especially during the preliminary design phase. A series of laboratory studies were conducted to determine the effects of twenty aggregates with very different origins and properties on various properties of concretes. Laboratory tests with the same or similar principles as aggregate rocks have been repeated for concrete samples produced using these aggregates. Nine SRA equations were generated to directly predict similar concrete properties with the help of aggregate properties. Equations with very high coefficients of determination were produced between various aggregate properties and concrete properties except for the SHH property. In addition, nonlinear multiple regression analysis (NMRA) was used for twenty-four equations to predict some basic properties of concrete (strength, abrasion, tensile, and impact). The performances of the derived equations were evaluated with a statistical tool developed by the author. Accordingly, the models with the strongest prediction capacity were obtained for STSC, LAC, CSC, and, IEC respectively. Results from NMRA showed that equations with the highest coefficient of determination were obtained with Model-3 for CSC (Equation 15), and STSC (Equation 18), and Model-1 for LAC (Equation 22), and IEC (Equation 31). Concrete has a complex structure that is affected by many parameters. In accordance with this complex nature, the approach to predict the main concrete properties with nonlinear multiple methods by including similar aggregate properties as well as non-destructive methods representing concrete/aggregate (hardness, ultrasonic pulse velocity and physical properties) has been successful. The extremely high coefficients of determination, ranging from 0.81 to 0.96, obtained with NMRA, indicate that basic concrete properties can be strongly predicted by aggregate properties and some concrete properties that can be tested non-destructively.

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Effects of coarse aggregates on the mechanical properties, durability and microscopic behaviour of mortar rubble

Cited by 4 publications

References 33 publications

Experimental Study on the Dynamic Fracture Characteristics of Mortar–Rock Interface Zones with Different Interface Inclinations and Shapes

Experimental Study on the Dynamic Fracture Characteristics of Mortar–Rock Interface Zones with Different Interface Inclinations and Shapes

Examination of Damage Evolution in Slurry Masonry Schist Subjected to Biaxial Compressive Stresses

Statistical investigation of the effects of different origin aggre-gate properties on the mechanical properties of concrete

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