無(wú)機(jī)非金屬專業(yè)外文翻譯---粉煤灰高性能混凝土的工程應(yīng)用-免費(fèi)閱讀
【正文】 在混凝土中用粉煤灰取代 20%的水泥，可使混凝土 7d的水化熱下降 11%。在基礎(chǔ)工程等不與大氣接觸的混凝土工程中，由于與 CO2隔絕，不會(huì)發(fā)生碳化反應(yīng)，因此可較多地?fù)郊臃勖夯遥猿?分降低混凝土的水化熱，提高混凝土的耐久性。 粉煤灰混凝土的抗碳化性能較差。由于現(xiàn)代混凝土中外加劑的 9 使用，一方面，可減少混凝土拌和用水量，減小水灰比，提高混凝土中水泥的濃度；另一方面，減水劑能使水泥中硅酸鈣水化所產(chǎn)生的 Ca(OH)2增多，有利于粉煤灰與Ca(OH)2 的二次水化反應(yīng)，激發(fā)粉煤灰的活性，這對(duì)于改善粉煤灰的早期強(qiáng)度是有效的，另外，使用 粉煤灰活性激發(fā)劑或在非大體積混凝土中使用早強(qiáng)型水泥，也可以補(bǔ)償粉煤灰的摻入對(duì)混凝土早期強(qiáng)度的影響。低鈣粉煤灰中的微粒為硅氧四面體結(jié)構(gòu)，自身的活性很低。它以優(yōu)異的耐久性（而不是高強(qiáng)度）為主要特征，也就是說(shuō)，任何強(qiáng)度等級(jí)的混凝土都可以做成高耐久性混凝土。 On the other hand, waterreducing agent can make cement silicic acid calcium ink Ca (OH ) 2 produced 2 increase, help fly ash and water two times of 2 of Ca (OH )2 to reflect , excites the activation of the fly ash, this effectual for early intensity to improve fly ash, in addition use fly ash activation excite pharmaceutical or in large volume use strong cement early among the concrete non, can pensate mixing the impact on early intensity of concrete of fly ash too. and easy Whether fly ash there are the following several points to concrete and getting easy improvement function.(1)The highquality fly ash contains more than 70% of the spherical vitreous bodies, too smooth to have raised angle the body surface of these spherical glass, performance is steady, play a kind of lubricated function which is similar to the bearing in the pump sending , shaking the course of smashing of the concrete。 1 附錄 A 英文原文 Project application of the Highperformance Concrete of fly ash [The summary ] Every performance of this text to highperformance concrete of fly ash has done detailed research, and to the concrete respectively to person who mix of fly ash Kinds of influence of performance and fly ash concrete some questions that should notice carry on analysis and discussion in not constructing. 1. Summary Fly ash, as a kind of industrial waste material, resources are abundant , cheap, and contain a large amount of active position , it is modern concrete Central Africa A often important ponent part . The highquality fly ash is applied to the concrete rationally , not only can replace the cement partly , save the fabrication cost of the project, And, its peculiar performance can be used in the concrete of various kinds of instructions for use very effectively, improve the performance of the concrete, It is the ideal in the highperformance concrete that admixes the material . Among it is at concrete not modern, whose name is already with cement in fly ash, collect material , water , admixture and Kind is important, bee a ponent part in concrete. Fly ash highperformance concrete regard durability as main goal go on design mix Congeal the soil . It regards excellent durability (instead of the high strength) as the main characteristic , that is to say, concrete capital of any grade of intensity Can make into the high durability concrete . In order to reach high durability, the performance that the fly ash concrete should possess is: Mixing the state newly well Work,namely, without emanating, secreting by water, so that shaping the even , closely knit by mobility, harden not shrinking subsiding early water and Water shrink light, warm to rise low, harde n course is it dwindle to do, in order to reach having the initial crack, the permeability after hardenning is low. 2． function and effect of the fly ash are fly ash material technology and application foundation of the project. 2 Mix and add the powder of the concrete Coal ash, in conformity with understanding that the function of the fly ash is made overallly, by volcanic ash react and economic ponent part general to fly ash originally Read , expand technological consciousness of fly ash effect to , make fly ash function can serve performanc
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