配合比的主要参数对掺MgO水泥基材料压蒸膨胀变形的影响

Influence of mix factor on autoclave-treated expansibility of cement-based materials mixed with magnesium oxide

本文介绍外掺MgO的水泥净浆、水泥砂浆和混凝土中的砂浆的压蒸膨胀率的室内试验结果,分析配合比的主要参数对外掺MgO的水泥基材料压蒸膨胀率的影响规律及其成因。结果表明,水泥基材料的压蒸膨胀率随水灰比的增大而降低,随MgO外掺量的增加而提高;混凝土中砂浆的压蒸膨胀率随着粉煤灰掺量的增加而减小,并与砂浆的灰砂质量比相关。论文的研究成果对MgO混凝土的进一步研究和推广应用有参考意义。

This paper presents test results of autoclave-treated expansibilities of cement paste, cement mortar and mortar in concrete with light-burned magnesium oxide. Based on these results, the influences of mix factors on autoclave-treated expansibility are analyzed. Results show that for cement-based materials the expansibility is increasing with decreasing of water/cement ratio or increasing of magnesium oxide, while for mortar in concrete, it is decreasing with fly ash content increasing and it depends on cementation material/ sand ratio. This work provides a basis for farther study on the exploitation of concrete materials mixed with magnesium oxide.