無機(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-wenkub
2023-05-19 00:55:53 本頁面
【正文】 otherwise, the response is relatively slow. Under or is close to 100% 25% in the relative humidity, namely the occasion in the abundant dryness or water saturation of concrete, have more difficult to produce carbonization shrink concretes. In such concrete projects not contacted with the atmosphere as the foundation works ,etc., because of isolating with CO2, can take place carbonization react , so can mix and add the fly ash more , in order to fully reduce the heat of hydration of the concrete, improve the durability of the concrete. It is ultra to be adopt law quantity replace,water glue not lower than,mix carry on match ratio design waterreducing agent for admixture of main fact at the same time, can make fly ash concrete resist carbonization performance improve to some extent. reinforcing bar corrosion Reinforcing bar of concrete can it antirusts to be because concrete getting alkaline to form one prepressing passivation membrane in metal surface. Is it add fly ash to mix among concrete, on one hand it consume Ca (OH ) 2, reduce the alkali environment of the 6 concrete。(2)The concrete stage while hardenning: Regulate the course of hardenning, reduce the heat of hydration。 And, have reducing water function in various degree on the concrete。 (2)Active effect: The active position SiO2 of the fly ash and water result of AI2O3 and cement react in a situation that there is water, producing water silicic acid calcium (CSH ) and water sour calcium (CASH ) of sulphur aluminium, these responses nearly all go on in the grout hole, water that produce result pack , cut apart the heavy original hole , make the hole thinning, can reduce the hole rate within the concrete , change the hole structure , improve glueing the function of forming of concrete every ponent part 。 (3)The concrete stage after hardenning: Raise the intensity on later stage , raise every durability, such as antipermeability, resist the sulphate corroding, suppress the alkali Collect the material and react etc.. Intensity The fly ash has three kinds of influence on the intensity of concrete: Reduce water consumption , increase glued material content and reflect through the longterm volcanic ash that raises his intensity. The particle in the fly ash of low calcium is the silicon oxygen tetrahedron structure, one’s own activation is very low. In the final result of the cement, high alkaline water silicic acid calcium and crystallization of colloid of Ca (OH )2 are very low in intensity, especially Ca (OH) 2 ask vigorous to e 12% , stone of intensity only, but Ca (OH) 2 volume account for whole cement 25% , stone of volume. A large number of silicon , aluminium oxide that contain in the fly ash, can and high alkaline water silicic acid calcium responses take place with Ca (OH )2 progressively, produce intensity than high low alkaline water silicic acid calcium , so , make cement stone water glue congeal quantity of material increase, and make its quality improved by a large margin , is favorable to the improvement of the intensity of concrete. Meanwhile, to is it can disperse cement particle to mix fly ash, make cement to be ink sufficient, improve closely knit degree of the grout , make the intensity of the interfaces of the aggregate and grout in the concrete improve. Fly ash is it draw intensity pare with contribution of the bending strength pression strength to be heavy to confront with each other, this is useful to resisting the performance of splitting of concrete. The elastic mould amount of the fly ash concrete is similar to pression strength, it is early and on the low side, improve progressively later stage , get 28d the constant basi
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號-1