RELATIONSHIP BETWEEN ATMOSPHERIC TEMPERATURE VARIATION AND THE SHRINKAGE CRACKING IN CONCRETE STRUCTURE : Part 1, Atmospheric Temperature Variation as a Cause of Concrete Cracking

1975 ◽  
Vol 236 (0) ◽  
pp. 1-10
Author(s):  
MASATOSHI NAKANISHI
Keyword(s):  
Temperature Variation ◽  
Concrete Structure ◽  
Atmospheric Temperature ◽  
Shrinkage Cracking ◽  
Concrete Cracking

scholarly journals The lunar diurnal variation of atmospheric temperature at Batavia, 1866-1928

1932 ◽  
Vol 137 (831) ◽  
pp. 1-24 ◽  
Keyword(s):  
Heat Flow ◽  
Temperature Variation ◽  
Wave Length ◽  
Barometric Pressure ◽  
Atmospheric Temperature ◽  
Vertical Flow ◽  
Tidal Changes ◽  
Long Time ◽  
Semidiurnal Variation ◽  
Established Fact

The existence of a lunar tide in the earth’s atmosphere is now a well-established fact. It is indicated by a lunar semidiurnal variation of barometric pressure, found at every station for which the necessary reductions have been made. Now a variation of pressure in a gas is in general accompanied by a variation of temperature. The amount of this variation depends on the rate at which heat can flow in the gas, from a region of compression to one of rarefaction, or from the earth or ocean to or from the gas. The maximum variation of temperature corresponds to adiabatic changes of pressure, while if the heat flow can be very rapid, the temperature variation may be reduced almost to zero, corresponding to isothermal changes of pressure. I have shown that the lunar tidal changes of pressure will be almost adiabatic so far as concerns heat flow in the gas , between regions of compression and of rarefaction. The long time available for equalisation of temperature, viz., a quarter of a lunar day, or about 6 hours, is in fact ineffective because of the long wave-length of the tide, the distance between the regions of highest or lowest pressure in any latitude being a quarter of the circumference of the circle of latitude. The temperature variation might be reduced below the adiabatic value if vertical flow of heat, between the air and the ground or ocean, is sufficiently rapid. This point will be discussed in another paper; the conclusion reached is that the vertical flow of heat is unlikely to be important over the land . Hence a temperature variation approaching the adiabatic value is likely to be associated with the lunar atmospheric tide at a land station.

Performance Study on Masonries of Different Aerated Concrete Blocks

2014 ◽  
Vol 633 ◽  
pp. 299-302 ◽  
Author(s):  
Peng Fei Peng ◽  
Xian Ming Qin ◽  
Yu Sheng Wu
Keyword(s):  
Water Absorption ◽  
Natural Condition ◽  
Crack Width ◽  
Concrete Block ◽  
Performance Study ◽  
Shrinkage Cracking ◽  
Concrete Cracking ◽  
Concrete Masonry ◽  
Concrete Blocks ◽  
Aerated Concrete

The masonries with a square of 2m×3m of 3 different aerated concrete blocks were built respectively, and plastered with plastering mortar. The shrinkage-cracking property and other performances of different aerated concrete masonries were studied in natural condition. The results showed that, there were less cracks and smaller crack width in the masonry of aerated concrete with low water absorption, the condition of aerated concrete cracking can be improved by plastering with plastering mortar; the shrinkage of aerated concrete block masonry with low water absorption is smaller, the shrinkage of aerated concrete masonry plastered by special plastering mortar is smaller.

The impact of uneven temperature distribution on stability of concrete structures using data analysis and numerical approach

2020 ◽  
pp. 136943322095061
Author(s):  
Xuyan Tan ◽  
Weizhong Chen ◽  
Luyu Wang ◽  
Jianping Yang
Keyword(s):  
Temperature Distribution ◽  
Tensile Stress ◽  
Statistical Model ◽  
Temperature Variation ◽  
Concrete Structure ◽  
Shield Tunnel ◽  
Structure Stability ◽  
Mechanical Behaviors ◽  
Analytical Results

Temperature variation is an essential factor to influence the stability of concrete structure. In contrast to the uniform distribution of temperature in most existing approaches, this paper aims to study the natural temperature distribution in concrete structure and analyze its impact on structural mechanical behaviors in field. As a case study, an underwater shield tunnel is investigated using the presented method. Firstly, temperature sensors are installed in different positions to achieve real-time monitoring in field. Then, a statistical model is derived by monitoring data to describe temperature variation. As a core component of the approach, the devised statistical model is integrated into our program to determine the external loads imposed on model. Finally, the mechanical behaviors of concrete structure are discussed under uneven temperature distribution. Analytical results indicated the magnitudes of temperature distribution is related to different positions of structure, in which the significant distinctions can be observed at upper and lower of tunnel as well as the inside and outside structures. Also, the tensile stress of tunnel lining increases with the rise of temperature, for instance, in this case study per temperature rising would lead to an increment 25.3 KPa of tensile stress. As a promising application, the analytical results provide an assessment of concrete structure stability.

TEMPERATURE COMPENSATOR 30 and 32

Alloy Digest ◽  
1957 ◽  
Vol 6 (10) ◽  
Keyword(s):  
Physical Properties ◽  
Surface Treatment ◽  
Temperature Variation ◽  
Magnetic Permeability ◽  
Temperature Compensation ◽  
Heat Treating ◽  
Atmospheric Temperature ◽  
Iron Alloys ◽  
Nickel Iron ◽  
Electrical Apparatus

Abstract TEMPERATURE COMPENSATOR 30 and 32 are nickel-iron alloys whose magnetic permeability decreases proportionally with increasing temperatures within the usual range of atmospheric temperature variation. They are recommended for temperature compensation applications in electrical apparatus. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: Fe-15. Producer or source: Carpenter.

Transient Diffusion Behavior of Chloride Ions in Concrete with a Macro Crack

2013 ◽  
Vol 405-408 ◽  
pp. 2671-2676
Author(s):  
Song Mu ◽  
Geert De Schutter ◽  
Jian Zhong Liu
Keyword(s):  
Diffusion Coefficient ◽  
Apparent Diffusion Coefficient ◽  
Concrete Structure ◽  
Crack Width ◽  
Chloride Ions ◽  
Chloride Diffusion ◽  
Concrete Cracking ◽  
Cracked Concrete ◽  
Diffusion Behavior ◽  
Apparent Diffusion

Nowadays, influences of concrete cracking on durability of concrete structure are widely reported. However, the influence of macro cracks on chloride diffusion of concrete is unknown under the condition of marine submergence. Therefore, the present paper adopted a notch method to study natural chloride diffusion in cracked concrete with a width of above 0.3 mm. The results show Apparent diffusion coefficient of acid soluble chloride rises from 2.66 ×10-12 m2/s to 5.92×10-12 m2/s with increasing crack width from 0 mm to 0.45 mm. Besides, one exponential function was used to describe the piecewise relationship between diffusion coefficient (water or acid soluble chloride) and crack width.

Minimum Reinforcement Ratio of Concrete Beams Reinforced with FRP Bars

2011 ◽  
Vol 282-283 ◽  
pp. 553-556
Author(s):  
Chun Xia Li ◽  
Shi Lin Yan
Keyword(s):  
Concrete Structure ◽  
Concrete Beams ◽  
Flexural Capacity ◽  
Concrete Member ◽  
Stress Strain ◽  
Concrete Cracking ◽  
Minimum Reinforcement ◽  
Stress Strain Relation ◽  
Simplified Calculation ◽  
Frp Bars

Based on the non-linearity stress strain relation of concrete, the cracking moment of plain flexural concrete member is established, and the flexural capacity of concrete beams reinforced with FRP bars is also obtained under FRP rupture-controlled failure. To prevent FRP rupture failure upon concrete cracking, the minimum reinforcement ration should be derived from simplified calculation, which may provide some theoretic guidance on design and construction for concrete structure reinforced with FRP bars.

Investigations on the Impact of Non-Longitudinal Cracks on the Durability of Concrete Structure

2014 ◽  
Vol 584-586 ◽  
pp. 1208-1216
Author(s):  
Xiu Jing Zhou ◽  
Jia Ming Shu ◽  
Bo Ming Wu ◽  
Xv Chu Ren ◽  
Wei Zhong Gan
Keyword(s):  
Concrete Structure ◽  
Civil Engineering ◽  
Site Investigation ◽  
Generation Process ◽  
Concrete Cracking ◽  
Main Factors ◽  
Longitudinal Cracks ◽  
The Impact ◽  
Durability Of Concrete

Concrete structure is widely used in civil engineering. Concrete cracking, a common and frequently occurring disease, is one of the main factors that cause impaired concrete structure durability. This paper analyzes the generation process and features of non-longitudinal concrete cracking. With on-site investigation of selected buildings in Ningbo, the paper discusses the main existing non-longitudinal cracks and their impact on the durability of concrete structure.

scholarly journals Atmospheric Temperature Variation after the 1991 Mt. Pinatubo Eruption

1992 ◽  
Vol 70 (6) ◽  
pp. 1161-1166 ◽  
Author(s):  
Masahiro Kawamata ◽  
Shingo Yamadal ◽  
Tatsuya Kudoh ◽  
Kiyoharu Takano ◽  
Shoji Kusunoki
Keyword(s):  
Temperature Variation ◽  
Atmospheric Temperature ◽  
Pinatubo Eruption
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