粉煤灰对外掺氧化镁混凝土自生体积变形的影响

为了进一步探索粉煤灰对外掺MgO混凝土自生体积变形的影响规律,在实验室进行了粉煤灰对掺MgO的一级配、二级配和三级配混凝土的自生体积变形影响的试验。结果表明:粉煤灰的掺入使掺MgO混凝土的早期自生体积变形增大,后期降低。粉煤灰何时使掺MgO混凝土的自生体积变形从高于转化为低于不掺粉煤灰混凝土的自生体积变形,与粉煤灰的掺量及MgO的掺量有关。研究成果对进一步促进外掺MgO混凝土和粉煤灰的研究与应用,具有实际意义。

Influence of fly ash content on autogenic volume change of concrete mixed with MgO

In order to understand the influence of fly ash content on autogenic volume change of concrete mixed with light-burned MgO,autogenic volume changes of one grading MgO concrete mixed with different fly ash content had been tested.Moreover,autogenic volume changes of two grading and three grading fly ash concrete mixed with different MgO content had been tested.Test results show that autogenic volume changes of concrete mixed with fly ash is reduced at late age and is advanced at earlier age.When autogenic volume changes of fly ash concrete from bigger than autogenic volume changes of no fly ash concrete changed to less than autogenic volume changes of no fly ash concrete,it has some connection with fly ash content and MgO content.The fruit has practical significance for farter study and apply of concrete mixed with MgO and fly ash.