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混凝土的碳化就是空气中的CO_2与混凝土中的Ca(OH)_2发生以下反应: Ca(OH)_2+CO_2—→CaCO_3+H_2O 因此碳化结果PH值为之降低。钢筋混凝土中的钢筋表面有一层钝化膜。钝化膜为20—60A介子的水化氧化物(Y—Fe_2O_3·nH_2O),它是防止钢筋锈蚀的保护层,故钝化膜一经破坏或消失,钢筋即行锈蚀,作为水泥的混合材,粉煤灰是否对钢筋产生锈蚀,迄今尚无确切的意见。因此作者将南昌七里街火电厂的湿排粉煤灰加工磨细,而后对以实体积计的粉煤灰不同掺量,对混凝土强度、碳化和PH的影响从而对钢筋锈蚀的影响,进行了对比试验,取得了5年龄期试验资料,现就试验结果阐述如下;
Carbonation of concrete is the reaction of CO_2 in air with Ca (OH) _2 in concrete. The reaction of Ca (OH) _2 + CO_2 - → CaCO_3 + H_2O will result in the decrease of carbonization value. Reinforced concrete surface with a layer of passive film. The passivation film is a hydration oxide (Y-Fe 2 O 3 · nH 2 O) of 20-60A meson, which is a protective layer that prevents corrosion of reinforcing steel. Therefore, once the passivation film is destroyed or disappears, the reinforcing steel will rust, and as a mixed material of cement, Whether the coal ash corrosion of steel, so far there is no exact opinion. Therefore, the author of Nanchang Qili Street thermal power plant wet pulverized coal processing, and then to the actual volume of different fly ash content, the impact of concrete strength, carbonation and PH of the corrosion of steel, were carried out Comparative tests, obtained 5 years of age test data, the test results are described below;