Experimental Study on the Material and Environmental Property of Ancient Adobe Brick

2015 ◽  
Vol 1120-1121 ◽  
pp. 1485-1490
Author(s):  
Jian Li Yuan ◽  
Yun Yang ◽  
Sheng Nan Peng
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Mass Loss ◽  
Power Function ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Damage Mechanism ◽  
Rammed Earth ◽  
Environmental Property ◽  
Rammed Earth Wall

Aiming at the environmental property and damage mechanism of ancient adobe buildings, the material components, compressive strength and freezing-thawing resisting performance of ancient adobe bricks were tested and analyzed. Based on test data, the power function relation between nondestructive rebound value and compressive strength of adobe bricks was established, and the nonlinear correlation curve between mass loss rate and freezing–thawing cycles of adobe bricks was also determined. The study shows that the compressive strength of ancient adobe brick is greater than that of adobe in traditional rammed earth wall, and ancient adobe brick is inferior to fired brick at the waterproofing quality and freezing resisting performance, it needs to adopt surface waterproofing measures for ancient adobe buildings to improve the resisting capacity to environmental erosion.

Experimental Study on the Factors Concerning the Ignition Time and Mass Loss Rate of Timber

2003 ◽  
Vol 21 (1) ◽  
pp. 29-39 ◽  
Author(s):  
Jing-Yan Zhang ◽  
Li-Zhong Yang ◽  
Zai-Fu Guo ◽  
Zhi-Hua Deng
Keyword(s):  
Experimental Study ◽  
Mass Loss ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Ignition Time

scholarly journals Experimental Investigation on the Freeze–Thaw Resistance of Steel Fibers Reinforced Rubber Concrete

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1260
Author(s):  
Tao Luo ◽  
Chi Zhang ◽  
Chaowei Sun ◽  
Xinchao Zheng ◽  
Yanjun Ji ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Mass Loss ◽  
Loss Rate ◽  
Bending Strength ◽  
Mass Loss Rate ◽  
Steel Fibers ◽  
Freeze Thaw ◽  
Four Point Bending ◽  
Rubber Concrete

The reuse of rubber in concrete results in two major opposing effects: an enhancement in durability and a reduction in mechanical strength. In order to strengthen the mechanical properties of rubber concrete, steel fibers were added in this research. The compressive strength, the four-point bending strength, the mass loss rate, and the relative dynamic elastic modulus of steel fiber reinforced rubber concrete, subjected to cyclic freezing and thawing, were tested. The effects of the content of steel fibers on the freeze–thaw resistance are discussed. The microstructure damage was captured and analyzed by Industrial Computed Tomography (ICT) scanning. Results show that the addition of 2.0% steel fibers can increase the compressive strength of rubber concrete by 26.6% if there is no freeze–thaw effect, but the strengthening effect disappears when subjected to cyclic freeze–thaw. The enhancement of steel fibers on the four-point bending strength is effective under cyclic freeze–thaw. The effect of steel fibers is positive on the mass loss rate but negative on the relative dynamic elastic modulus.

Experimental Study on Scale Effect on Mass Loss Rate of Some Woods

2002 ◽  
Vol 20 (1) ◽  
pp. 23-35 ◽  
Author(s):  
Yang Lizhong ◽  
Guo Zaifu ◽  
Zhang Jingyan ◽  
Chen Xiaojun ◽  
Deng Zhihua
Keyword(s):  
Experimental Study ◽  
Mass Loss ◽  
Scale Effect ◽  
Loss Rate ◽  
Mass Loss Rate

scholarly journals Corrosion Performance of Nano-TiO2-Modified Concrete under a Dry–Wet Sulfate Environment

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5900
Author(s):  
Chao Xu ◽  
Hao-Hao Liao ◽  
You-Liang Chen ◽  
Xi Du ◽  
Bin Peng ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Mass Loss ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Peak Stress ◽  
Xrd Analysis ◽  
Concrete Surface ◽  
Test Results ◽  
Nano Tio2 ◽  
Ordinary Concrete

This study compared the effects of the sulfate dry–wet cycle on the properties of ordinary concrete and nano-TiO2-modified concrete, including the mass loss rate, ultrasonic wave velocity, compressive strength, and XRD characteristics. In addition, a series of compression simulations carried out using the PFC2D software are also presented for comparison. The results show the following: (1) with an increase in dry–wet cycles, the damage to the concrete gradually increased, and adding nano-TiO2 into ordinary concrete can improve the material’s sulfate resistance; (2) after 50 sulfate dry–wet cycles, the mass loss rate of ordinary concrete was –3.744%, while that of nano-TiO2-modified concrete was −1.363%; (3) the compressive strength of ordinary concrete was reduced from 41.53 to 25.12 MPa (a reduction of 39.51%), but the compressive strength of nano-TiO2-modified concrete was reduced from 49.91 to 32.12 MPa (a reduction of 35.64%); (4) after a sulfate dry–wet cycle, the nano-TiO2-modified concrete surface produced white crystalline products, considered to be ettringite based on the XRD analysis; (5) when considering the peak stress and strain of the concrete samples, the numerical results agreed well with the test results, indicating the reliability of the method.

Study on Freeze-Thaw Performance of Polypropylene Fiber Reinforced Cement-Stabilized Aggregate

2012 ◽  
Vol 446-449 ◽  
pp. 2595-2598 ◽  
Author(s):  
Yin Hua Ma ◽  
Jian Yi Gu
Keyword(s):  
Compressive Strength ◽  
Mass Loss ◽  
Fiber Length ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Polypropylene Fiber ◽  
Strength Increase ◽  
Freeze Thaw ◽  
Splitting Strength ◽  
Reinforced Cement

In this paper, the authors study the anti-freeze-thaw performance of a new type of semi-rigid base material named polypropylene fiber reinforced cement-stabilized aggregate, and freeze-thaw mass loss rate, freeze-thaw compressive strength, freeze-thaw splitting strength are used to evaluate the effect of polypropylene fiber on the anti-freeze-thaw performance, and the relationship of polypropylene fiber content, polypropylene fiber length with the anti-freeze-thaw performance are analyzed. The test after 10 freeze-thaw cycle shows that the mix of polypropylene fiber increase the freeze-thaw compressive strength and freeze-thaw splitting strength, and decrease the mass loss rate greatly. At the same time, the paper also determine the reasonable fiber content and fiber length, under this mix proportion, the mass loss rate reduce by 80%, the freeze-thaw compressive strength increase more than 12.1% and freeze-thaw splitting strength increase more than 13.4%. This research has laid an important foundation for the follow-up research and practice.

scholarly journals EXPERIMENTAL STUDY ON INFLUENCE OF STACK EFFECT ON FIRE IN THE COMPARTMENT ADJACENT TO STAIRWELL OF HIGH RISE BUILDING

2014 ◽  
Vol 20 (1) ◽  
pp. 121-131 ◽  
Author(s):  
Wen Xi Shi ◽  
Jie Ji ◽  
Jin Hua Sun ◽  
S. M. Lo ◽  
Lin Jie Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Mass Loss ◽  
Heat Release ◽  
Release Rate ◽  
Tilt Angle ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Air Flow ◽  
Stack Effect ◽  
High Rise

In this paper, to study the influence of stack effect on fire in the compartment adjacent to a stairwell, a set of experiments were conducted by varying the pool size, top vent state and bottom vent size in a 1/3 scaled 12-layer-stairwell configuration. The phenomenon of methanol flame tilting in the fire room was observed and studied. Results showed that the flame tilt angle increases with an increase of Ri-1. The temperatures of hot gases in the fire room decrease due to the cooling effect of fresh air induced by stack effect. The mass loss rate of methanol fuel is influenced by fresh air flow sucked into fire room due to stack effect. On the basis of the experimental results, we conclude that the velocity of air flow into fire room is proportional to 1/3 power of the heat release rate in the stairwell.

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