摘要
为深入了解水化硅酸镁凝胶(M-S-H)的性质,本研究以MgO、H2_O,硅灰和稻壳灰为原材料,制备MgO-SF、MgO-RHA浆体,在室内合成M-S-H凝胶产物。通过X射线衍射(XRD),热重(TG)分析,差示扫描量热(DSC)等方法,研究了MgO-SF、MgO-RHA浆体在不同的养护温度、养护周期和SiO_2掺量情况下,对水化生成M-S-H凝胶的影响。研究表明:随着养护温度和养护周期的增长,M-S-H凝胶的生成量逐渐增多。试验表明,养护温度为40℃,养护周期为28 d时,生成的M-S-H凝胶最多。硅灰和稻壳灰均可作为水泥基原材料制备M-S-H凝胶。当MgO与SiO_2掺量的摩尔比为1∶1.5时,两者可以完全反应,比两者摩尔比为1∶1时生成的M-S-H凝胶多。相同条件下,MgO-RHA浆体中的M-S-H凝胶含量比MgO-SF浆体中略少。
To understand the basic properties of hydrated magnesium silicate（M-S-H）gel,MgO,H2_O,silica fume（SF）and rice husk ash（RHA）to produce MgO-SF and MgO-RHA pastes.Magnesium silicate hydrated（M-S-H）gel was synthesized in laboratory.MgO-SF and MgO-RHA pastes were produced under different curing temperatures,curing time,and SiO_2 dosage.The hydrated M-S-H was researched by X-ray diffraction（XRD）,thermogravimetry analysis（TGA）,and differential scanning calorimetry（DSC）etc.Results indicated that the M-S-H gel amount was gradually increasedby long curing time and higher curing temperature.The M-S-H gel reached the highest peak with a curing temperature of 40 ℃ at 28 d.Study shows that rice husk ash could be used as raw materials to prepare M-S-H gel as well as the silica fume.Compared to the paste with MgO∶SiO_2=1∶1 by molar,the one with MgO∶SiO_2=1∶1.5 achievedmore M-S-H gel.And also,under the same condition,the past with SF produce more M-S-H gel than that with RHA.
出处
《混凝土》
CAS
北大核心
2017年第11期81-86,共6页
Concrete
基金
"十二.五科技支撑计划"项目(2014BAG05B04)
长安大学中央高校基金(2014G5210006)
关键词
建筑材料
化学合成
水化硅酸镁(M-S-H)
影响因素
热分析
building material
synthesis
magnesium silicate hydrate （M-S-H）
impact factors
thermogravimetry analysis
