外文翻譯---粉煤灰高性能混凝土的工程應(yīng)用(完整版)
【正文】 進(jìn)行最快，否則，反應(yīng)較慢。 水化熱 粉煤灰對(duì)降低混凝土水化熱的作用十分明顯。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?以充分降低混凝土的水化熱，提高混凝土的耐久性。 碳化性能 粉煤灰混凝土的抗碳化性能較差。如果對(duì)混凝土的早期強(qiáng)度有嚴(yán)格要求，粉煤灰的摻量不宜超過(guò) 30%，冬季施工非大體積混凝土?xí)r，粉煤灰的摻量不宜超過(guò) 20%。 強(qiáng)度 粉煤灰對(duì)混凝土強(qiáng)度有三種影響：減少用水量、增大膠結(jié)材含量和通過(guò)長(zhǎng)期火山灰反應(yīng)提高其強(qiáng)度。粉煤灰高性能混凝土是以耐久性為主要目標(biāo)進(jìn)行設(shè)計(jì)的混凝土。 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.. 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 2 colloid of Ca (OH ) 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 2 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 basic concrete is raised by 510%. With to hold strength of wrapping up in reinforcing bar, 28d , fly ash of concrete is it form intensity the same with ,etc. basic concrete of grade basically to glue, but homogeneity, fly ash of concrete fine, is it form intensity person who test getting dispersed and kind than basic concrete to glue. temperature is low , will reflect necessary time is longer. If strict with early intensity of the concrete, the mixing amount of the fly ash is unsuitable to exceed 30%, winter construction large volume at the concrete, the mixing amount of the fly ash is unsuitable to exceed 20% non. Because modern concrete China and foreign countries add use of pharmaceutical, on one hand, reducible concrete mix and stir water consumption, it reduce by dust water than,of not lasting concrete density of cement。 And, have reducing water function in various degree on the concrete。 ⑶ .Mix fly ash can pensate detailed deficiency of bits in the detailed aggregate , cut off mortar base body secrete continuity , water of channel, the fly ash that at the same time quality is good can reduce the mixing water consumption of the concrete under the same consistency, make water dust of concrete than reduce light level to , is it secrete ink and emanate the phenomenon to reduce. liqui
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1