Air permeability and thermal performance of concrete block wall specimens

2010 ◽  
Vol 34 (2) ◽  
pp. 163-177 ◽  
Author(s):  
R. Becker
Keyword(s):  
Thermal Performance ◽  
Concrete Block ◽  
Air Permeability ◽  
Block Wall

scholarly journals Development and Performance Test including Mechanical and Thermal of New Tenon Composite Block Masonry Walls

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Hui Su ◽  
Dongyue Wu ◽  
Mengying Shen ◽  
Wei Chen ◽  
Shilin Wang
Keyword(s):  
Thermal Performance ◽  
Performance Test ◽  
Concrete Block ◽  
Masonry Walls ◽  
Design Code ◽  
Concrete Material ◽  
Mixing Ratios ◽  
Block Wall ◽  
Common Block ◽  
And Performance

To improve the thermal performance of external masonry walls, a new tenon composite block is proposed as the external maintenance component which contains the internal hollow concrete block part, the external block part, and the extruded polystyrene layer fixed by tenons. The production process and concrete material mixing ratio were optimized for the new tenon composite block to promote its application. The mechanical strength and thermal properties of the optimized tenon composite blocks were tested with experiments and numerical simulation in this study. The testing and simulation results indicated that after utilizing the two optimized concrete mixing ratios, the tenon composite block strength matched the strength requirements according to the related design code. The thermal performance of the tenon composite block wall was also good compared with that of a common block wall.

Experimental Study on Compressive Property of New Concrete Block Masonry with Multi-Row Cores

2014 ◽  
Vol 501-504 ◽  
pp. 461-465
Author(s):  
Zhao Yan Cui ◽  
Fu Sheng Liu ◽  
Shun Ke Zhang
Keyword(s):  
Energy Saving ◽  
Diffusion Mechanism ◽  
Concrete Block ◽  
Compressive Property ◽  
Insulation Material ◽  
Test Results ◽  
Failure Characteristics ◽  
New Energy ◽  
Heat Insulation Material ◽  
Block Wall

With the development of energy-saving in buildings, new energy-saving block masonry with multi-row cores is commonly used. In this paper, from the study of typical bearing capacity of multi hole concrete block masonry of combining multiple rows of holes, holes in the multi block wall masonry capacity test of heat insulation material characteristics. Test results show that, in the process of multi hole masonry brittle failure characteristics, built-in straw block in the insulation at the same time, can improve the compressive strength of masonry; masonry local diffusion mechanism under the action of stress is significant; and offer the engineering measures.

Seismic Retrofit of Concrete Block Wall Intersections Using Composite Laminates

2009 ◽  
Vol 29 (11) ◽  
pp. 1609-1625
Author(s):  
Wael W. El-Dakhakhni ◽  
Steve George ◽  
Marwan T. Shedid
Keyword(s):  
Composite Laminates ◽  
Concrete Block ◽  
Seismic Retrofit ◽  
Block Wall

Mechanical Modal and Numerical Simulation of Fracture Process of Block Wall

2011 ◽  
Vol 217-218 ◽  
pp. 1438-1443
Author(s):  
Yan Li ◽  
Xin Sheng Yin ◽  
Bo Wang
Keyword(s):  
Numerical Simulation ◽  
Fracture Toughness ◽  
Fracture Process ◽  
Concrete Block ◽  
Critical Value ◽  
Specimen Size ◽  
Linear Elastic ◽  
Block Wall ◽  
Elastic Fracture ◽  
Aerated Concrete

Aerated concrete is a typical non-uniform quasi-brittle materials, the fracture process is very complicated. To slove the problem of cracks in this block walls, a practical analytical method was proposed based on the vertical mortar joint model to solve the equivalent fracture toughness (the critical value which the crack occurred to spread unstable) With the use of the basic principle of composite material mechanics and linear elastic fracture mechanics. Against the results of the related experiments, the standard deviation and the coefficient of variation of Analytical Solution are smaller, , and the equivalent fracture toughness is the effective fracture parameters of independent of specimen size. So the suggested method is more feasible and applicable, which can forecast autoclaved aerated concrete block wall’s cracking and destroying.

Impact factors analysis on the thermal performance of hollow block wall

2014 ◽  
Vol 75 ◽  
pp. 330-341 ◽  
Author(s):  
Yuan Zhang ◽  
Kai Du ◽  
Jiapeng He ◽  
Liu Yang ◽  
Yanjun Li ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Impact Factors ◽  
Factors Analysis ◽  
Hollow Block ◽  
Block Wall

The Location of Building Defects Using Structural Intensity

1996 ◽  
Vol 3 (4) ◽  
pp. 217-231
Author(s):  
Robert J.M. Craik ◽  
R. Wilson ◽  
R. Ming
Keyword(s):  
Point Source ◽  
Line Source ◽  
Power Flow ◽  
Concrete Block ◽  
Background Intensity ◽  
Concrete Floor ◽  
Structural Intensity ◽  
Residual Intensity ◽  
Block Wall

Many defects in the construction of buildings act as transmission paths across which unwanted sound can travel. The resulting increase in power flow can be measured using structural intensity techniques and the location of the source found from the intersection of two or more intensity vectors. This technique can be used to locate a source (or sometimes a sink) when the intensity being measured is above the residual or background intensity. Some applications of this technique are discussed and it is used to locate a point source on a concrete floor and a line source exciting a concrete block wall. The technique was found to work well for a point source but was less reliable for a line source. This was partly because a line source is less well spatially defined and partly because the damping of the wall was low, resulting in a high residual intensity.

The Effects of Friction on the Performance of A Concrete Block Mine Seal with Pressurized Grout Bags

2014 ◽  
Vol 59 (3) ◽  
pp. 793-805
Author(s):  
Kyle A. Perry
Keyword(s):  
Finite Element ◽  
Coal Mine ◽  
Concrete Block ◽  
Ventilation Network ◽  
Underground Coal Mine ◽  
Seal Failure ◽  
Design Loads ◽  
Block Wall ◽  
Coal Reserves ◽  
Solid Block

Abstract Mine seals are necessary in nearly every underground coal mine to isolate mined-out areas from the ventilation network. Many seals are already in place in active mines and more need to be constructed to keep up with the development of underground coal reserves. The accidents involving seal failures at Sago and Darby prompted MSHA to create and implement new regulations regarding the strength of the seals. These regulations require the design and construction of seals that are larger and stronger than ever before. Structural seals capable of withstanding the new required design loads are now designed by an engineer and no longer approved through explosion testing. Prior to the seal failure accidents, a solid-block wall with pressurized grout bags at the wall/ribs and wall/roof interfaces was a popular design which met the 137.9 kPa (20 psi) requirement. After implementation of the new 344.7 kPa (50 psi) or 827.4 kPa (120 psi) design regulations depending on whether the atmosphere is kept inert inby the seal, a re-design of the seal was necessary. This paper discusses the quantification of the coefficients of friction which are then implemented into finite element modeling.

Sign in / Sign up

Export Citation Format

Share Document