Flexural and Shear Strength of Granite Reinforced by Metal Rods

2010 ◽  
Vol 133-134 ◽  
pp. 417-422 ◽  
Author(s):  
Sung Gul Hong ◽  
Woo Young Lim
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Stone Masonry ◽  
Experimental Program ◽  
Notched Specimens ◽  
Dowel Action ◽  
Final Failure ◽  
Ductile Behavior

This paper investigates feasibility of reinforcement method for fractured granite of slab type and beam members used as components of old stone masonry pagodas. Investigation of the effect of reinforcement to flexural and shear strength is performed using the concept for the high strength concrete since the mechanical properties of granite are similar to properties of high strength of concrete. In this experimental program two types of notched specimens are intended for failures with shear and flexural cracks. Intended fractured specimens are reinforced by metal rods, so called pinning method. The rods are inserted in holes and bonded with inorganic cement. The metal rods are supposed to transfer forces by tensile resistance in flexure and dowel action in shear. Increase in shear and flexural capacities and ductile behavior after sudden yielding of the metal rods are observed. The final failure cracks in reinforced specimens occurred different from interfaces along the original cracks. Locations of metal rods, their numbers, and construction of anchored rod are main variables to be examined for guidelines for reinforcement methods.

Test Study of Shear Strength of High Strength Stone Masonry

2010 ◽  
Vol 452-453 ◽  
pp. 365-368 ◽  
Author(s):  
Da Lin Hu ◽  
Feng Cheng ◽  
Long Gang Chen
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
High Strength ◽  
Stone Masonry ◽  
Aggregate Concrete ◽  
Long Span ◽  
Test Study ◽  
Design Value ◽  
Concrete Joints ◽  
Arch Bridges

In China many long span stone arch bridges were built in the last 5 decades, most of these bridges were built with micro-aggregate concrete joint masonry. However, the mechanical properties of this kind masonry have been seldom studied. Based on 5 groups of specimens with C30 or C40 micro-aggregate concrete joints and dressed blocks, shear strength of the masonry is tested and analyzed, friction coefficients and empiric formulas of shear strength of the masonry are presented in this paper, design value of shear strength of the masonry is assessed and discussed.

Investigation on Performance of Concrete Incorporating Silica Fume and Local UAE Materials

2019 ◽  
Vol 803 ◽  
pp. 222-227 ◽  
Author(s):  
Reem Sabouni ◽  
Hassan Raad Abdulhameed
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
United Arab Emirates ◽  
High Strength Concrete ◽  
High Strength ◽  
Partial Replacement ◽  
Favorable Effect ◽  
Experimental Program ◽  
Strength Concrete ◽  
Local Materials

In an effort to reduce the amount of cement in the concrete industry and produce greener concrete, emphasis was put on using several industrial by-products such as silica fume, fly ash and slag as partial replacements for cement in concrete. Due to the enormous number of mega reinforced concrete projects constructed in the United Arab Emirates, it is considered to be one of the largest consumers of high strength concrete in the region. On the other hand, only limited research has been done on high strength concrete incorporating local materials in the UAE. The main objective of this research is to conduct an investigation on the performance of high strength concrete containing silica fume as partial replacement of ordinary Portland cement incorporating superplasticizers and local UAE materials by studying its mechanical properties and durability. The experimental program involved two groups: The first group had a water-to-binder material ratio (w/b) of 0.4, whereas, the second group had w/b = 0.3. For both groups the silica fume replacement percentages were 0 (control mix) 5, 7.5, 10, 12.5, and 15 percent. The mechanical properties were tested at 7, 28, and 91 days and the durability tests were performed at 28 days. The results were compared to the control mix and they showed that for all the curing ages studied the use of silica fume as partial replacement of OPC has favorable effect on the compressive strength values and the optimum replacement ratios of silica fume for the tested specimens are found to be at 12.5% and 10% replacement for the w/b ratios of 0.3 and 0.4, respectively. For all the four performed durability tests the replacement of the OPC with silica fume is found to have favorable results and the higher the silica fume percentage replacement of OPC the more favorable the results are. The detailed description of the used mixes and the main conclusions drawn from this research are presented in this paper

scholarly journals Effect of Moisture Content on the Behavior of High Strength Concrete at High Temperatures

2020 ◽  
Vol 25 (1) ◽  
Author(s):  
Larissa Degliuomini Kirchhof ◽  
Rogério Cattelan Antocheves de Lima ◽  
Almir Barros da Santos Neto ◽  
Alana Costa Quispe ◽  
Luiz Carlos Pinto da Silva Filho
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
High Strength Concrete ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
High Strength ◽  
Experimental Program ◽  
High Moisture ◽  
Strength Concrete ◽  
Normal Strength

ABSTRACT In this paper, an experimental program was carried out to investigate the residual mechanical properties of high strength concrete and normal strength concrete, and how moisture content and temperature affect the spalling process. Three mixtures with water-cementitious material ratios, from 0.25 to 0.50, and with different saturation levels were heated in an electric furnace to elevated temperatures, from 200°C to 600°C. After heating, the specimens were cooled down to room temperature and then tested for compression and tensile strength. The results showed that high moisture content induces the spalling process and reduces considerably the mechanical properties of high strength concrete, mainly at temperatures above 400°C.

scholarly journals Effect on Compressive Strength of Concrete by Addition of Polypropylene Fiber in M20 Grade of Concrete

2019 ◽  
pp. 156-159 ◽  
Author(s):  
Gursharan Singh ◽  
Haresh Kumar
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Strength Concrete ◽  
Polypropylene Fiber ◽  
High Strength ◽  
Concrete Specimen ◽  
Experimental Program ◽  
Curing Conditions ◽  
Compressive Strength Of Concrete ◽  
Curing Condition

The paper deals with the effects of addition of various proportions of polypropylene fiber on the properties of high strength concrete m20 mixes. An experimental program was carried out to explore its effects on compressive strength under different curing condition. the main aim of the investigation program is to study the effect of polypropylene fiber mix by varying content such as 0%, 0. 5%, 1%, 1. 5%, 2% and find the optimum polypropylene fiber content. the concrete specimen were tested at different age level for mechanical properties of concrete name compressive strength of the concrete. a detailed study was carried out of curing conditions. the increase were compressive strength

scholarly journals MECHANICAL PROPERTIES OF HIGH STRENGTH CONCRETE AT HIGH TEMPERATURES

2008 ◽  
Vol 73 (624) ◽  
pp. 341-347 ◽  
Author(s):  
Masashi MATSUDO ◽  
Hirokazu NISHIDA ◽  
Takahiro OHTSUKA ◽  
Takeo HIRASHIMA ◽  
Takeo ABE
Keyword(s):  
Mechanical Properties ◽  
High Temperatures ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete

scholarly journals Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams

2020 ◽  
Vol 10 (2) ◽  
pp. 642 ◽  
Author(s):  
Luís Bernardo ◽  
Sérgio Lopes ◽  
Mafalda Teixeira
Keyword(s):  
Experimental Study ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
Concrete Strength ◽  
High Strength ◽  
Experimental Program ◽  
Pure Torsion ◽  
Strength Concrete ◽  
Hollow Beams

This article describes an experimental program developed to study the influence of longitudinal prestress on the behaviour of high-strength concrete hollow beams under pure torsion. The pre-cracking, the post-cracking and the ultimate behaviour are analysed. Three tests were carried out on large hollow high-strength concrete beams with similar concrete strength. The variable studied was the level of longitudinal uniform prestress. Some important conclusions on different aspects of the beams’ behaviour are presented. These conclusions, considered important for the design of box bridges, include the influence of the level of prestress in the cracking and ultimate behaviour.

Comparison Analysis on the Mechanical Properties of HSC and NSC after the Action of High Temperatures

2014 ◽  
Vol 1014 ◽  
pp. 49-52
Author(s):  
Xiao Ping Su
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperatures ◽  
High Strength Concrete ◽  
Elasticity Modulus ◽  
Strain Curve ◽  
Peak Stress ◽  
High Strength ◽  
Peak Strain ◽  
Strength Concrete

With the wide application of high strength concrete in the building construction,the risk making concrete subject to high temperatures during a fire is increasing. Comparison tests on the mechanical properties of high strength concrete (HSC) and normal strength concrete (NSC) after the action of high temperature were made in this article, which were compared from the following aspects: the peak stress, the peak strain, elasticity modulus, and stress-strain curve after high temperature. Results show that the laws of the mechanical properties of HSC and NSC changing with the temperature are the same. With the increase of heating temperature, the peak stress and elasticity modulus decreases, while the peak strain grows rapidly. HSC shows greater brittleness and worse fire-resistant performance than NSC, and destroys suddenly. The research and evaluation on the fire-resistant performance of HSC should be strengthened during the structural design and construction on the HSC buildings.

scholarly journals Numerical and experimental evaluation of masonry prisms by finite element method

2017 ◽  
Vol 10 (2) ◽  
pp. 477-508 ◽  
Author(s):  
C. F.R. SANTOS ◽  
R. C. S. S. ALVARENGA ◽  
J. C. L. RIBEIRO ◽  
L. O CASTRO ◽  
R. M. SILVA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
High Strength Concrete ◽  
Numerical Models ◽  
High Strength ◽  
Experimental Tests ◽  
Experimental Results ◽  
Concrete Blocks ◽  
Micro Modeling ◽  
Modeling Strategy

Abstract This work developed experimental tests and numerical models able to represent the mechanical behavior of prisms made of ordinary and high strength concrete blocks. Experimental tests of prisms were performed and a detailed micro-modeling strategy was adopted for numerical analysis. In this modeling technique, each material (block and mortar) was represented by its own mechanical properties. The validation of numerical models was based on experimental results. It was found that the obtained numerical values of compressive strength and modulus of elasticity differ by 5% from the experimentally observed values. Moreover, mechanisms responsible for the rupture of the prisms were evaluated and compared to the behaviors observed in the tests and those described in the literature. Through experimental results it is possible to conclude that the numerical models have been able to represent both the mechanical properties and the mechanisms responsible for failure.

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