A discussion of the paper “Cement-saturation and its effects on the compressive strength and stiffness of concrete” by B.J. Addis and M.G. Alexander

1995 ◽  
Vol 25 (5) ◽  
pp. 1124-1126
Author(s):  
F. de Larrard ◽  
J. Marchand
Keyword(s):  
Compressive Strength ◽  
Strength And Stiffness

Numerical Analysis and Mechanical Properties of Nomex™ Honeycomb Core

2017 ◽  
Author(s):  
Yue Liu ◽  
Weicheng Gao ◽  
Wei Liu ◽  
Zhou Hua
Keyword(s):  
Compressive Strength ◽  
Cell Walls ◽  
Mechanical Response ◽  
Compressive Loading ◽  
Fe Model ◽  
Honeycomb Core ◽  
Practical Applications ◽  
Honeycomb Sandwich ◽  
Nomex Honeycomb ◽  
Strength And Stiffness

This paper presents an investigation on the mechanical response of the Nomex honeycomb core subjected to flatwise compressive loading. Thin plate elastic in-plane compressive buckling theory is used to analyze the Nomex honeycomb core cell wall. A mesoscopic finite element (FE) model of honeycomb sandwich structure with the Nomex honeycomb cell walls is established by employing ABAQUS/Explicit shell elements. The compressive strength and compressive stiffness of Nomex honeycomb core with different heights and thickness of cell walls, i.e. double cell walls and single cell walls, are analyzed numerically using the FE model. Flatwise compressive tests are also carried out on bare honeycomb cores to validate the numerical method. The results suggest that the compressive strength and compression stiffness are related to the geometric dimensions of the honeycomb core. The Nomex honeycomb core with a height of 6 mm has a higher strength than that of 8 mm. In addition, the honeycomb core with lower height possesses stronger anti-instability ability, including the compressive strength and stiffness. The proposed mesoscopic model can effectively simulate the crushing process of Nomex honeycomb core and accurately predict the strength and stiffness of honeycomb sandwich panels. Our work is instructive to the practical applications in engineering.

scholarly journals Effects of Crumb Rubber on Compressive Strength of Cement-Treated Soil

2015 ◽  
Vol 61 (4) ◽  
pp. 59-78 ◽  
Author(s):  
F. C. Wang ◽  
W. Song
Keyword(s):  
Compressive Strength ◽  
Cement Content ◽  
Rubber Particle ◽  
Crumb Rubber ◽  
Test Results ◽  
Rubber Content ◽  
Strength Tests ◽  
Strength And Stiffness ◽  
Cement Soil ◽  
Curing Age

A study was undertaken to investigate the effects of crumb rubber on the strength and mechanical behaviour of Rubberized cement soil (RCS). In the present investigation, 26 groups of soil samples were prepared at five different percentages of crumb rubber content, four different percentages of cement content and two different finenesses of crumb rubber particle. Compressive strength tests were carried out at the curing age of 7 days, 14 days, 28 days and 90 days. The test results indicated that the inclusion of crumb rubber within cement soil leads to a decrease in the compressive strength and stiffness and improves the cement soil’s brittle behaviour to a more ductile one. A reduction of up to 31% in the compressive strength happened in the 20% crumb content group. The compressive strength increases with the increase in the cement content. And the enlargement of cement content is more efficient at low cement content.

Influence of blocks and grout on compressive strength and stiffness of concrete masonry prisms

2018 ◽  
Vol 182 ◽  
pp. 233-241 ◽  
Author(s):  
Roseli Oliveira Guedes Martins ◽  
Gustavo Henrique Nalon ◽  
Rita de Cássia Silva Sant'Ana Alvarenga ◽  
Leonardo Gonçalves Pedroti ◽  
José Carlos Lopes Ribeiro
Keyword(s):  
Compressive Strength ◽  
Concrete Masonry ◽  
Strength And Stiffness

Compressive strength and stiffness of Radiata Pine laminated veneer lumber

2013 ◽  
Vol 71 (6) ◽  
pp. 795-804 ◽  
Author(s):  
Wouter A. van Beerschoten ◽  
David M. Carradine ◽  
Alessandro Palermo
Keyword(s):  
Compressive Strength ◽  
Radiata Pine ◽  
Laminated Veneer Lumber ◽  
Strength And Stiffness

Experimental investigation of Tied Foam Core sandwich compression performance

2017 ◽  
Vol 22 (2) ◽  
pp. 349-369 ◽  
Author(s):  
Mohamed Adli Dimassi ◽  
Christian Brauner ◽  
Oliver Focke ◽  
Axel Siegfried Herrmann
Keyword(s):  
Compressive Strength ◽  
Failure Modes ◽  
Volume Fraction ◽  
Core Material ◽  
Foam Core ◽  
Compression Tests ◽  
Compression Performance ◽  
Compressive Loads ◽  
X Ray Computed ◽  
Strength And Stiffness

Carbon and glass dry fibre bundles were inserted into a ROHACELL® 71HERO polymethacrylimide foam core under a specific inclination angle and pin pattern in order to enhance the compressive strength and stiffness of the core material. Flatwise compression tests were conducted on pin-reinforced sandwich specimens and unreinforced sandwich to investigate the effect of pin volume fraction and pin material on the compressive mechanical properties and energy absorption characteristics. X-ray computed tomography was performed on tested specimens to investigate the failure modes under compressive loads. It was concluded that the compressive strength is mainly controlled by pin failure due to bending and compression loads at pin base. Moreover, increasing the pin volume fraction improved the compressive properties of the sandwich but using glass fibre pins instead of carbon fibre pins led to a higher increase of the absorbed crushing energy. Finally, an existing analytical model to predict the compressive strength and stiffness has been tested and evaluated.

scholarly journals Degradation of Strength and Stiffness of Sandstones Caused by Wetting-Drying Cycles: The Role of Mineral Composition

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Lu Chen ◽  
Yichao Rui ◽  
Yihan Zhao
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Moisture Content ◽  
Mechanical Parameters ◽  
Test Results ◽  
Strength And Stiffness ◽  
Rock Mechanical Properties ◽  
Mineral Constituents ◽  
Compressive Tests

Rock mechanical parameters are of great importance for the construction and design of rock engineering. Rocks are usually subjected to the deteriorating effect of cyclic wetting-drying because of the change in moisture content. The main objective of this study is to reveal the degradation effects of wetting-drying cycles on strength and modulus on varying rocks. Three kinds of sandstones with different mineral constituents are selected for testing. Artificial treatments of cyclic wetting-drying are conducted on respective specimens of the three sandstones (0, 10, 20, 30, and 40 cycles) to simulate the damage of rocks exposed to natural weathering. Uniaxial compressive tests are carried out on sandstone specimens to obtain their strength and modulus. Test results show that, for the tested sandstones, both of the uniaxial compressive strength (UCS) and modulus are reduced as the cyclic number rises. In the first ten cycles, the losses of UCS and modulus are very significant. Subsequently the changes of UCS and modulus become much more placid against cyclic number. When the cyclic number is the same, the loss percentages of rock mechanical properties of the three sandstones are very different which mainly depends on the contents of expandable and soluble minerals.

scholarly journals Push-out Tests for Determining Shear Strength and Stiffness of Perfobond Connector-Experimental Study

2019 ◽  
Vol 12 (4) ◽  
pp. 225-231
Author(s):  
Khawla A. Farhan ◽  
Muhaned A. Shallal
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Lightweight Concrete ◽  
Steel Tube ◽  
Ultimate Shear Strength ◽  
Concrete Blocks ◽  
Strength And Stiffness ◽  
Square Steel Tube ◽  
Concrete Filled Steel Tubes ◽  
Push Out

This study presents an experimental investigation for push-out tests in order to evaluate the performance of continuous perfobond connectors. A total of five specimens composed of light-weight concrete-filled steel tubes (square and circle sections) with two reinforced blocks were tested. The measured parameters are the compressive strength of the concrete blocks and the type of the section. The specimens were tested under a concentric load applied on the steel tube filled with lightweight concrete; the corresponding slip value was measured   using two LVDTs. The experimental results showed that the ultimate shear strength and stiffness of the square steel tube filled with concrete were higher than that of circular samples. The ultimate shear strength and stiffness increased with an increase of concrete compressive strength, while the corresponding slips    showed decreasing in their values with increase of the compressive strength of the concrete.

An In Vitro Biomechanical Investigation of Compression Plating with Cable Cerclage for Repair of Oblique Osteotomies in Foal Femurs

1998 ◽  
Vol 11 (01) ◽  
pp. 23-28
Author(s):  
D. A. Wilson ◽  
W. L. Carson ◽  
K. G. Keegan ◽  
Rebecca L. Frankeny
Keyword(s):  
Compressive Strength ◽  
Bending Strength ◽  
Breaking Strength ◽  
Dynamic Compression ◽  
Three Point Bending ◽  
Compression Plate ◽  
Strength And Stiffness ◽  
Double Plating ◽  
Compression Plating

SummaryLong oblique diaphyseal osteotomies were created in 14 pairs of femurs from cadaver foals less than six months of age. One bone from each pair was repaired using two dynamic compression plates (DP), and the other was repaired using a dynamic compression plate with cable cerclage (CC). Seven pairs were tested in compression and seven pairs in craniolateral-caudomedial (CrL-CdM) three-point bending.A difference was not found in mean (± SD) breaking strength in compression between the DP (7257.19 ± 2004.08 N) and CC (7761.41 ± 2552.91 N) techniques. Nor was there a difference in mean stiffness in compression between the DP (2533.83 ± 1777.38 N/mm) and CC (3177.98 ± 1694.70 N/mm) techniques. There was no difference in mean stiffness in three-point bending between the DP (244.60 ± 60.80 N/mm) and CC (195.50 ± 80.90 N/mm) techniques. The mean bending breaking strength and bending moment for the DP technique (2839.36 ± 199.46 N and 124,932.00 ± 8776.38 N mm) was significantly (P = 0.02) greater than the CC technique (1940.39 ± 732.80 N and 85,377.72 ± 32243.34 N mm).The CC system was inferior to the DP technique in CrL-CdM three-point bending strength and moment, but provided equal bending stiffness and equal compressive strength and stiffness.The use of compression plating with cable cerclage was compared to double plating for repair of long oblique osteotomies in foal femurs. The repairs were tested in compression and 3-point bending. The compression plate with cable cerclage was inferior to double plating in bending strength and moment, but provided equal compressive strength and stiffness.

Sign in / Sign up

Export Citation Format

Share Document