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Download Concrete in Hot Environments (Modern Concrete Technology) by I. Soroka PDF

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By I. Soroka

This booklet is the 1st to provide a unified remedy of the topic. It concentrates at the houses of concrete, the constitution of cement, power, quantity alterations and sturdiness in sizzling environments and may be of serious price to scientists and engineers excited about glossy concrete expertise either in educational learn in addition to civil and structural engineering initiatives.

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Sample text

Effect of temperature on the hydration rate of Portland cement in accordance with the Arrhenius equation. 4]. Solving the equation accordingly (Fig. 6), it follows that the rise in the hydration temperature from T1=20°C to T2=30, 40 and 50°C, will increase the hydration rate by factors of 1·57, 2·41, and 3·59, respectively. That is, the accelerating effect of temperature on the hydration rate of Portland cement is very significant indeed. This expected accelerating effect of temperature is experienced, of course, in everyday practice and is supported by a considerable body of experimental data.

This protective effect of the alkaline surroundings is, of course, very important with respect to the durability of reinforced concrete structures, and is further discussed in Chapter 10. The hydration of the cement results in heat evolution usually referred to as the heat of hydration. The heat of hydration of OPC varies, depending on its mineralogical composition, from 420 to 500J/g. 2. SETTING AND HARDENING 25 Fig. 2. Schematic description of the hydration of a cement grain. 4. 3 that at a later stage the hydration reactions are essentially of a topochemical nature and as such take place mostly on the surface of the cement.

On the other hand, the ultimate strength of LHPC may be even higher than that of ordinary or RHPC (Fig. 6). The presence of C3A makes the cement vulnerable to sulphate attack. Hence, the reduced C3A content improves the sulphate-resisting properties of LHPC. 3, the properties of LHPC are similar to those of sulphate-resisting cement. 3. Sulphate Resisting Cement (SRPC) Portland cement is vulnerable to sulphate attack and this vulnerability is mainly due to the presence of C3A. 1). This attack, however, involves volume increase and expansion which, in turn, may cause cracking and subsequently lead to severe deterioration.

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