scholarly journals Diagonal Tensile Test on Masonry Panels Strengthened with Textile-Reinforced Mortar

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7021
Author(s):  
Dragoș Ungureanu ◽  
Nicolae Țăranu ◽  
Dan Alexandru Ghiga ◽  
Dorina Nicolina Isopescu ◽  
Petru Mihai ◽  
...  
Keyword(s):  
Tensile Test ◽  
Cement Mortar ◽  
Unreinforced Masonry ◽  
Experimental Results ◽  
Reference Panel ◽  
Shear Mode ◽  
Numerical Program ◽  
Textile Reinforced Mortar ◽  
Mortar Matrix

This study presents the results of an experimental and numerical program carried out on unreinforced masonry panels strengthened by textile-reinforced mortar (TRM) plastering. For this purpose, five panels were constructed, instrumented and tested in diagonal shear mode. Two panels were tested as reference. The first reference panel was left unstrengthened, while the second one was strengthened by a traditional self-supporting cement mortar matrix reinforced with steel meshes. The remaining three panels were strengthened by TRM plastering applied on one or both faces and connected with transversal composite anchors. The numerical and the experimental results evidenced a good effectiveness of the TRM systems, especially when applied on both panel facings.

Experimental Study on the Effectiveness of Masonry-Basalt TRM Reinforced Systems Characterized by Different Fiber Grid Densities

2017 ◽  
Vol 747 ◽  
pp. 266-273 ◽  
Author(s):  
Carmelo Caggegi ◽  
Giuseppe Ferrara ◽  
Emma Lanoye ◽  
Đức Bình Nguyễn ◽  
Aron Gabor ◽  
...  
Keyword(s):  
Experimental Study ◽  
Experimental Results ◽  
Masonry Buildings ◽  
Suitable Solution ◽  
Historical Masonry ◽  
Promising Solution ◽  
Textile Reinforced Mortar ◽  
Single Shear ◽  
Mortar Matrix

The use of Textile Reinforced Mortar (TRM) systems is emerging as a suitable solution for strengthening historical masonry buildings, as they are made of compatible materials often resulting in limited and reversible interventions. Moreover, TRM systems reinforced by basalt textile are a very promising solution. This study presents the results of single shear-lap tests intended at defining and comparing the effectiveness of three reinforced basalt TRM-masonry systems characterized by different strengthening ratios. These systems have been obtained by inserting one, two or three basalt grids in the TRM composite. The experimental results show that a slippage of the fiber roving within the mortar matrix frequently occurs in the reinforced system characterized by a low strengthening ratio; the increase in fiber grid density often results in a brittle debonding between the lower and the upper layer of mortar matrix. The results show that a high strengthening ratio may result in decreasing the strengthening performances.

scholarly journals Damping Property of Cement Mortar Incorporating Damping Aggregate

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 792 ◽  
Author(s):  
Yaogang Tian ◽  
Dong Lu ◽  
Jianwei Zhou ◽  
Yuxuan Yang ◽  
Zhenjun Wang
Keyword(s):  
Mechanical Properties ◽  
Cement Mortar ◽  
Damping Ratio ◽  
Polypropylene Fiber ◽  
Lightweight Aggregate ◽  
Experimental Results ◽  
Optimal Dosage ◽  
Polymer Emulsion ◽  
Rubber Powder ◽  
Damping Property

This study proposes a new cement mortar incorporating damping aggregate (DA) and investigates the mechanical properties and damping property of the cement mortar. Four types of DA were prepared, lightweight aggregate presaturated water and three types of polymer emulsion. Further, the effects of polypropylene fiber and rubber powder on the performance of the cement mortar were studied. The experimental results showed that the damping ratio of specimens containing 70% DA was approximately three times higher than that of the reference mortar, with a slight decrease in the mechanical properties. Adding fiber was more effective than rubber powder in improving the damping ratio of the cement mortar, and the optimal dosage of fiber was 0.5%.

Strength and Porosity of Cement Mortar Blended with Metakaolin

2013 ◽  
Vol 838-841 ◽  
pp. 142-147 ◽  
Author(s):  
Jamilu Usman ◽  
Abdul Rahman Mohd Sam ◽  
Salihuddin Radin Sumadi
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Cement Mortar ◽  
Quantitative Relationship ◽  
Experimental Results

An experimental investigation was carried out to assess the effect of metakaolin (MK) on the compressive strength, flexural strength and porosity of cement mortar. The cement was partially substituted with MK at 0-30% replacement levels. The results show that the strengths and porosity of mortar containing up to 20% were superior to that of control (0% MK). The Balshin equation fits the experimental results of compressive strength and porosity of the specimens containing MK and there is a strong quantitative relationship between compressive strength and porosity of the specimens.

Realizing pure shear mode of dielectric elastomers by tuning biaxial prestress of a deformation controller

2021 ◽  
Author(s):  
Liling Tang ◽  
Yuxi Ding ◽  
Lei Liu ◽  
Junshi Zhang
Keyword(s):  
Large Deformation ◽  
Shear Deformation ◽  
Pure Shear ◽  
Deformation Mode ◽  
Experimental Results ◽  
Free State ◽  
Dielectric Elastomers ◽  
Shear Mode ◽  
Mechanical Loads ◽  
Soft Actuators

Abstract In this article, we propose a method to realize the pure shear deformation mode of dielectric elastomer (DE) membranes by tuning two in-plane prestresses. With utilization of carbon grease electrodes, VHB 4905 membranes are prestretched and attached into a retractable device, forming a pure-shear deformation controller. Experimental results demonstrate that, accurate pure shear deformation mode of DEs can be realized by tuning the mechanical loads in the two directions of the deformation controller. Furthermore, large deformation in the direction of free state can be achieved without electromechanical instabilities. The designed deformation controller accurately realizes the specific pure shear deformation mode of DEs and can be utilized to help design the practical soft actuators.

scholarly journals Feasibility of Using Phase Change Materials to Control the Heat of Hydration in Massive Concrete Structures

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Won-Chang Choi ◽  
Bae-Soo Khil ◽  
Young-Seok Chae ◽  
Qi-Bo Liang ◽  
Hyun-Do Yun
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Cement Mortar ◽  
Concrete Structures ◽  
Experimental Tests ◽  
Heat Of Hydration ◽  
Hydration Heat ◽  
Experimental Results ◽  
Mass Concrete

This paper presents experimental results that can be applied to select a possible phase change material (PCM), such as a latent heat material (LHM), to control the hydration heat in mass concrete structures. Five experimental tests (microconduction, simplified adiabatic temperature rise, heat, and compressive strength tests) were conducted to select the most desirable LHM out of seven types of inorganic PCM used in cement mortar and to determine the most suitable mix design. The results of these experimental tests were used to assess the feasibility of using PCM to reduce hydration heat in mass concrete that was examined. The experimental results show that cement mortar containing barium- [Ba(OH)2·8H2O] based PCM has the lowest amount of total hydration heat of the cement pastes. The barium-based PCM provides good latent heat properties that help to prevent volume change and microcracks caused by thermal stress in mass concrete.

Low Temperature Wafer Direct Bonding Using Wet Chemical Treatment

2012 ◽  
Vol 482-484 ◽  
pp. 2381-2384
Author(s):  
Yan Li Zhao ◽  
Zi Jun Song ◽  
Yan Li ◽  
Hai Sheng San ◽  
Yu Xi Yu
Keyword(s):  
Low Temperature ◽  
Tensile Test ◽  
Silicon Oxide ◽  
Process Condition ◽  
Experimental Results ◽  
Optimum Process ◽  
Infrared Transmission ◽  
Chemical Surface ◽  
Wet Chemical ◽  
Wafer Direct Bonding

In this paper, the low-temperature (less than or equal to 400 °C) silicon wafer direct bonding technology using wet chemical surface treatment is proposed. For bonded pairs of silicon-oxide-covered wafers, the optimum process condition is established with respect to the experimental results of two different wet chemical processing methods. The bonding quality is evaluated through infrared transmission test and tensile test. Experimental results indicate that the bonding strength of the additional 29% NH3•H2O treated samples is about 7.2 MPa, while it is no more than 3.1 MPa for the only piranha (H2SO4/H2O2) solution and RCA1 (NH3•H2O/H2O2/H2O) solution cleaned samples. Effect of the pulling speed on tensile test is also investigated. The results show that the pulling speed effect should be considered during the tensile test.

Study on Mechanical Properties of Iron Wire Cement Mortar

2012 ◽  
Vol 594-597 ◽  
pp. 816-819
Author(s):  
Zhi Hao Liu ◽  
Chuan Xiao Liu ◽  
Dong Chen Huang ◽  
Long Wang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Uniaxial Compression ◽  
Compression Test ◽  
Cement Mortar ◽  
Experimental Results ◽  
Uniaxial Compression Test ◽  
Mass Ratio ◽  
Iron Wire

Through the uniaxial compression test, the mechanical properties of different placements of iron wire cement mortar, e.g. compressive strength and elastic modulus, were studied, and the mass ratios of cement, sands and water influencing the mechanical properties were put forward, which provided the experimental results for reference for the wide use of the iron wire cement mortar material. From the study it is gained that: (1) The best placement of the iron wires in cement mortar is horizontal. (2) The best mass ratio of the cement, sands and water is 1:4.70:0.81.

scholarly journals Mechanical Properties of Polypropylene Fiber Cement Mortar under Different Loading Speeds

2021 ◽  
Vol 13 (7) ◽  
pp. 3697
Author(s):  
Hui Chen ◽  
Xin Huang ◽  
Rui He ◽  
Zhenheng Zhou ◽  
Chuanqing Fu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Relative Error ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Experimental Results ◽  
Strength Tests ◽  
Sample Age

In this work, the relationships between the mechanical properties (i.e., compressive strength and flexural strength) and loading speed of polypropylene fiber (PPF)-incorporated cement mortar at different ages (before 28 days) were studied. A total of 162 cubic samples for compressive strength tests and 162 cuboid samples for flexural strength tests were casted and tested. Analytical relationships between the sample properties (i.e., sample age, PPF content, and loading speed) and compressive and flexural strength were proposed based on the experimental data, respectively. Of the predicted compressive and flexural strength results, 70.4% and 75.9% showed less than 15% relative error compared with the experimental results, respectively.

Failure Mechanism of Cementitious Nanocomposites Reinforced by Multi-Walled and Single-Walled Carbon Nanotubes Under Splitting Tensile Test

2018 ◽  
Author(s):  
Robabeh Jazaei ◽  
Moses Karakouzian ◽  
Brendan O’Toole ◽  
Jaeyun Moon ◽  
Samad Gharehdaghi
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Test ◽  
Failure Mechanism ◽  
Cement Mortar ◽  
Single Walled Carbon Nanotubes ◽  
Cement Matrix ◽  
Cooh Group ◽  
Single Walled Carbon ◽  
Splitting Tensile Test ◽  
Walled Carbon Nanotubes

Sudden concrete failure is due to inelastic deformations of concrete subjected to tension. However, synthesizing nanomaterials reinforcements has significant impact on cement-based composites failure mechanism. Nanomaterials morphology bridges cement crystals as homogeneous and ductile matrix. In this experiment, cement matrix with water to cement ratio of 0.5 reinforced by 0.2–0.6 wt% of functionalized (COOH group) multi-walled and single-walled carbon nanotubes were used. After sonication of carbon nanotubes in water solution for an hour, the cementitious nanocomposites were casted in cylindrical molds (25 mm diameter and 50 mm height). Failure mechanism of cementitious nanocomposite showed considerable ductility throughout splitting tensile test compared to cement mortar. Additionally, the failure pattern after developing the initial crack provided additional time before ultimate failure occurred in cement-based nanocomposites. The evolution of crack propagation was assessed until ultimate specimen failure during splitting-tensile test on cementitious nanocomposite surface. The deformation of cross section from circle to oval shape augmented tensile strength by 50% in cementitious nanocomposite compared to conventional cement mortar.

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