粉煤灰加气混凝土的煅烧活化及早强性能研究  

作　　者：杨秀丽[1] 崔崇[1] 崔晓昱[1] 秦娟[1] 袁洁[1] 

机构地区：[1]南京理工大学材料科学与工程学院,210094

出　　处：《加气混凝土》2014年第5期23-28,共6页

摘　　要：根据粉煤灰加气混凝土的差热分析（TGMDSC）确定了粉煤灰加气混凝土的煅烧温度。经煅烧活化后的粉煤灰加气混凝土遇水有大量Ca2＋溶出，具有再水化反应的能力。将不同温度煅烧后的粉煤灰加气混凝土作为水泥混合材，取代标准胶砂试块中的30％水泥，进行强度对比发现，经750℃煅烧后的粉煤灰加气混凝土掺入试块可提高早期强度，3d、7d强度分别达到标准试块的103．3％和113．6％；长期性能不受影响，365d强度达到106.4％。改变取代量进行研究后发现，取代量在15％内，3d强度均达到标准试块的116％。研究结果表明，经煅烧活化后的粉煤灰加气混凝土可作为水泥混合材使用，有助于提高试块的早期强度。The calcination temperature of fly-ash autoclaved aerated concrete （AAC） is confirmed by TGA/DSC. Fly-ash AAC has chemical reaction ability when it is heated at 745℃ which can hydrolyze Ca2＋ ions in water. Cal- cined fly-ash AAC is used as mixture material to replaced 30% cement, and the influence of different temperature on compressive strength is reasearched. The results show that calcined fly-ash at 750℃ can improve the early strength of blocks, the compressive strength ratios at 3d and 7d reach 103.31% and 113.55%, the compressive strength ratio at 365d up to 106.42%.When the replacement rate within 15%, the compressive strength ratio at 3d reached 116% compared with standard block.The results prove that fly-ash AAC calcined at 750℃ can be used as admixture in cement and concrete, and has contribution to the early strength of blocks.

关 键 词：粉煤灰加气混凝土 煅烧 水泥混合材 早期强度 

分 类 号：TU528.2[建筑科学—建筑技术科学]