By Zhu Bofang
Methods of controlling mass concrete temperatures diversity from fairly basic to complicated and from low-cost too expensive. looking on a selected scenario, it can be constructive to exploit a number of equipment over others. in response to the author's 50 years of non-public adventure in designing mass concrete buildings, Thermal Stresses and Temperature regulate of Mass Concrete provides a transparent and rigorous guide to picking the fitting thoughts to fulfill project-specific and monetary wishes. New strategies corresponding to very long time superficial thermal insulation, complete temperature keep watch over, and MgO self-expansive concrete are brought.
- Methods for calculating the temperature box and thermal stresses in dams, docks, tunnels, and urban blocks and beams on elastic foundations
- Thermal tension computations that take note of the affects of all elements and simulate the method of construction
- Analytical tools for identifying thermal and mechanical homes of concrete
- Formulas for picking out water temperature in reservoirs and temperature loading of arched dams
- New numerical tracking equipment for mass and semi-mature elderly concrete
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Extra info for Thermal Stresses and Temperature Control of Mass Concrete
Hyperbolic function f(τ) 5 τ/(n 1 τ) τ 1=2 5 n ð2:67Þ 3. Compound exponential function f(τ) 5 1 2 exp(2 gτ d) From Eq. 13. 71 Remark: (1) The concrete mark c18040 means the compressive strength of concrete at 180-day age is 40 MPa. (2) The extensibility of concrete is the maximum tensile strain before its failure under tension. 3 Meaning of Semi-Mature Age in Engineering If the semi-mature age of concrete is too short, the adiabatic temperature rise will increase rapidly and there is not enough time for the natural surface cooling and pipe cooling in the interior of the dam.
In a reservoir, the velocity of water is very small so the flow is laminar. The density of water is highest at 4 C, thus in a large reservoir, the water temperature is lowest at the bottom and higher in a higher elevation. The water at the same elevation will have the same temperature [93À95]. 10 . 9 Observed water temperature in Xingfengjiang reservoir in south China. 0 . 10 Observed water temperature in Fengman reservoir in northeast China. 0 7 8 40 0 –10 –20 1 2 3 4 5 6 9 10 11 12 Month the amplitude of annual variation of water temperature: AðyÞ 5 A0 e2βy ð2:36Þ the phase difference of water temperature: ε 5 2:15 2 1:30 e20:085y ðmonthÞ where y—depth of water, m τ—time, month ð2:37Þ Conduction of Heat in Mass Concrete, Boundary Conditions, and Methods of Solution 27 ω 5 2π/P—circular frequency of variation of water temperature P—period of variation, P 5 12 month ε—phase difference, month T(y,τ)—water temperature at depth y and time τ, C Tm(y)—annual mean temperature of water at depth y, C A(y)—the amplitude of annual variation, C τ 0—the time for maximum air temperature, month.
16 The autogenous deformation of concretes made by different kinds of cements. 17 The influence of the amount of admixture of fly ash on the autogenous deformation of concrete. For expressing the rate of growth of these concrete properties, it is suggested by the writer  that the ages when the adiabatic temperature rise, strength, and the modulus of elasticity reach the halves of their final values are defined as the semi-mature ages, which can be denoted by τ 1/2. The value of τ 1/2 reflects the rate of maturity of concrete.