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研究了三种加气混凝土(水泥-石灰-砂、水泥-矿渣-砂和水泥-石灰-粉煤灰)在人工碳化条件下的行为。 用红外光谱法分别测定完全碳化的三类加气混凝土吸收的CO_2的量,发现水泥-石灰-粉煤灰吸收的CO_2量小于另两类加气混凝土。但是,粉煤灰加气混凝土的碳化速度明显高于另两类。对完全碳化的样品的强度测定表明,与未碳化样品相比,粉煤灰制品碳化后强度下降的幅度大于另两类。 此外,在碳化过程中红外吸收峰由表征水化硅酸钙的Si—O键向硅胶的Si—O键逐渐转变。 合成了几种纯矿物,并比较了它们在人工碳化条件下的碳化速度,发现结晶度低的水化硅酸钙的碳化速度高于结晶完好的托勃莫来石,这有助于说明为什么粉煤灰加气制品的碳化速度高于另两类加气混凝土。 用扫描电镜-能谱研究了碳化前后的加气混凝土样品。此项研究对于说明在碳化进行的过程以及碳化后样品仍能保持强度以启示。
The behavior of three kinds of aerated concrete (cement-lime-sand, cement-slag-sand and cement-lime-fly ash) under artificial carbonization conditions was studied. The amount of CO2 absorbed by the fully carbonized three kinds of aerated concrete was measured by infrared spectroscopy, and it was found that the amount of CO2 absorbed by cement-lime-fly ash was lower than that of the other two types of aerated concrete. However, the carbonation rate of fly ash aerated concrete is significantly higher than that of the other two types. Measurements of the strength of the fully carbonized sample showed that the strength of the fly ash product after carbonization decreased more than the other two categories compared to the uncarbonized sample. In addition, the infrared absorption peak during carbonization gradually changes from the Si—O bond characterizing the hydrated calcium silicate to the Si—O bond of the silica gel. Several kinds of pure minerals were synthesized and their carbonation rates under artificial carbonization conditions were compared. It was found that the hydration rate of calcium silicate hydrates with low crystallinity is higher than that of crystallized Tobolite, which helps explain why The carbonation rate of fly ash aerated products is higher than that of the other two types of aerated concrete. The sample of aerated concrete before and after carbonization was studied by SEM-ESD. This study is to show that the process carried out during carbonization and the strength of the sample after carbonization can still maintain its strength.