废弃玻璃磨细成粉料后用作混凝土辅助胶凝材料,不仅可以控制ASR(alkali-silica reaction,碱-硅反应),而且还能激发其火山灰活性。采用砂浆棒快速法,将玻璃粉代替标准砂用作骨料,研究各种骨料替代率条件下的砂浆棒ASR膨胀率大小。掺量为...废弃玻璃磨细成粉料后用作混凝土辅助胶凝材料,不仅可以控制ASR(alkali-silica reaction,碱-硅反应),而且还能激发其火山灰活性。采用砂浆棒快速法,将玻璃粉代替标准砂用作骨料,研究各种骨料替代率条件下的砂浆棒ASR膨胀率大小。掺量为50%时,14 d ASR膨胀率最大。将玻璃骨料与标准砂以1∶1比例成型试件,探讨各种玻璃粉细度、掺量、养护温度、龄期条件下对砂浆棒ASR反应的抑制效果,粉磨时间越长,砂浆棒膨胀率呈降低趋势,掺入粉磨1h玻璃粉在相同掺量下对砂浆棒膨胀率的抑制效果最明显。养护温度对砂浆棒早期膨胀率起主导作用。展开更多
随着新工科建设理念的提出,在实践创新和个性化能力方面对实践教学提出了新的要求。岗位实习是无机非金属材料工程专业实践能力培养体系的关键环节,对培养学生的工程实践能力和专业素养起到支撑作用。本文结合新工科建设理念,根据学生...随着新工科建设理念的提出,在实践创新和个性化能力方面对实践教学提出了新的要求。岗位实习是无机非金属材料工程专业实践能力培养体系的关键环节,对培养学生的工程实践能力和专业素养起到支撑作用。本文结合新工科建设理念,根据学生多样化、个性化发展的实践需求,从创建岗位实习前期MOOC(Massive Open Online Course,慕课)、多阶段全过程跟踪性评价教学模式、“一生一策”个性化培养、教学师资队伍建设和多元化考核评价五个方面进行创新改革探索,形成培养具有专业综合能力的工程应用型人才岗位实习教学新体系,为推动无机非金属材料工程专业在新工科建设中的标杆作用奠定坚实的基础。展开更多
The hydraulic concrete durability under the alternation of freeze-thaw and carbonation has been systematically investigated in this work, where both the micro part and the microscopic characteristics of concrete inter...The hydraulic concrete durability under the alternation of freeze-thaw and carbonation has been systematically investigated in this work, where both the micro part and the microscopic characteristics of concrete interface were analyzed based on computed tomography(CT) test and scanning electron microscopy(SEM). Average CT numbers of each section, declined at water-cement ratio of 0.35, increased at 0.45, and changed a little at 0.55. The specimen in the absence of fly ash exhibited less types of hydration products and the surface was observed to be a needle-like ettringite, with a relatively dense overall structure. However, with the increase of fly ash content, pores and micro-cracks of specimen structure increased. Hexagonal flake calcium hydroxide, present in the specimen after the first carbonation, was negligible in the test pieces of the first freezethaw where the main hydration products were ettringite and calcium silicate gel. Regular hexagonal plates of calcium hydroxide exhibited in the interior of the specimen in which charring first occurred but calcium hydroxide rarely existed in the interior of the specimen in which freeze-thaw first occurred.展开更多
文摘废弃玻璃磨细成粉料后用作混凝土辅助胶凝材料,不仅可以控制ASR(alkali-silica reaction,碱-硅反应),而且还能激发其火山灰活性。采用砂浆棒快速法,将玻璃粉代替标准砂用作骨料,研究各种骨料替代率条件下的砂浆棒ASR膨胀率大小。掺量为50%时,14 d ASR膨胀率最大。将玻璃骨料与标准砂以1∶1比例成型试件,探讨各种玻璃粉细度、掺量、养护温度、龄期条件下对砂浆棒ASR反应的抑制效果,粉磨时间越长,砂浆棒膨胀率呈降低趋势,掺入粉磨1h玻璃粉在相同掺量下对砂浆棒膨胀率的抑制效果最明显。养护温度对砂浆棒早期膨胀率起主导作用。
文摘随着新工科建设理念的提出,在实践创新和个性化能力方面对实践教学提出了新的要求。岗位实习是无机非金属材料工程专业实践能力培养体系的关键环节,对培养学生的工程实践能力和专业素养起到支撑作用。本文结合新工科建设理念,根据学生多样化、个性化发展的实践需求,从创建岗位实习前期MOOC(Massive Open Online Course,慕课)、多阶段全过程跟踪性评价教学模式、“一生一策”个性化培养、教学师资队伍建设和多元化考核评价五个方面进行创新改革探索,形成培养具有专业综合能力的工程应用型人才岗位实习教学新体系,为推动无机非金属材料工程专业在新工科建设中的标杆作用奠定坚实的基础。
基金Funded by the National Natural Science Foundation of China(Nos.51279017,51539002 and 51139001)China Postdoctoral Science Foundation Funded Project(No.2015M582213)
文摘The hydraulic concrete durability under the alternation of freeze-thaw and carbonation has been systematically investigated in this work, where both the micro part and the microscopic characteristics of concrete interface were analyzed based on computed tomography(CT) test and scanning electron microscopy(SEM). Average CT numbers of each section, declined at water-cement ratio of 0.35, increased at 0.45, and changed a little at 0.55. The specimen in the absence of fly ash exhibited less types of hydration products and the surface was observed to be a needle-like ettringite, with a relatively dense overall structure. However, with the increase of fly ash content, pores and micro-cracks of specimen structure increased. Hexagonal flake calcium hydroxide, present in the specimen after the first carbonation, was negligible in the test pieces of the first freezethaw where the main hydration products were ettringite and calcium silicate gel. Regular hexagonal plates of calcium hydroxide exhibited in the interior of the specimen in which charring first occurred but calcium hydroxide rarely existed in the interior of the specimen in which freeze-thaw first occurred.
