Solutions of Mg(NO3)2·6H2O, Al(NO3)3·9H2O, NaOH and Na2CO3 were mixed in a rotating liquid memb rane reactor. The crystal growth process of Mg Al CO3 hydrotalcite was then studied by adding different amounts...Solutions of Mg(NO3)2·6H2O, Al(NO3)3·9H2O, NaOH and Na2CO3 were mixed in a rotating liquid memb rane reactor. The crystal growth process of Mg Al CO3 hydrotalcite was then studied by adding different amounts of water to the resulting slurry during the crystallizing process. The initial 6 hours of the crystallization was found to be the key period controlling crystal growth. Adding 150 to 250mL of water to the reaction system at the beginning of crystallization affords Mg Al CO3 hydrotalcite with relatively small particle size and large aspect ratio.展开更多
超高韧性水泥基复合材料(Ultra High Toughness Cementitious Composites,简称UHTCC)是一种具有超高韧性和良好耐久性能的新型混凝土材料,能够有效控制水工结构中有害裂缝的发生,提高结构耐久性。本文对标准立方体和4组不同高厚比UHTCC...超高韧性水泥基复合材料(Ultra High Toughness Cementitious Composites,简称UHTCC)是一种具有超高韧性和良好耐久性能的新型混凝土材料,能够有效控制水工结构中有害裂缝的发生,提高结构耐久性。本文对标准立方体和4组不同高厚比UHTCC棱柱体试件的压缩性能进行了试验研究,得到了受压应力-应变全曲线。结果表明,UHTCC抗压性能的尺寸效应规律有别于普通混凝土。抗压峰值应变(名义应变)与真实应变关系紧密,具有近似的比例关系;高厚比大于1时,高厚比对UHTCC棱柱体强度影响不大,有别于普通混凝土棱柱体试验结果;高厚比对UHTCC棱柱体峰值应变有较大影响,在一定程度上反映了环箍效应的作用。最后,在试验结果与分析的基础上提出了一个适用于不同高厚比的UHTCC压缩应力-应变模型。展开更多
文摘Solutions of Mg(NO3)2·6H2O, Al(NO3)3·9H2O, NaOH and Na2CO3 were mixed in a rotating liquid memb rane reactor. The crystal growth process of Mg Al CO3 hydrotalcite was then studied by adding different amounts of water to the resulting slurry during the crystallizing process. The initial 6 hours of the crystallization was found to be the key period controlling crystal growth. Adding 150 to 250mL of water to the reaction system at the beginning of crystallization affords Mg Al CO3 hydrotalcite with relatively small particle size and large aspect ratio.
文摘超高韧性水泥基复合材料(Ultra High Toughness Cementitious Composites,简称UHTCC)是一种具有超高韧性和良好耐久性能的新型混凝土材料,能够有效控制水工结构中有害裂缝的发生,提高结构耐久性。本文对标准立方体和4组不同高厚比UHTCC棱柱体试件的压缩性能进行了试验研究,得到了受压应力-应变全曲线。结果表明,UHTCC抗压性能的尺寸效应规律有别于普通混凝土。抗压峰值应变(名义应变)与真实应变关系紧密,具有近似的比例关系;高厚比大于1时,高厚比对UHTCC棱柱体强度影响不大,有别于普通混凝土棱柱体试验结果;高厚比对UHTCC棱柱体峰值应变有较大影响,在一定程度上反映了环箍效应的作用。最后,在试验结果与分析的基础上提出了一个适用于不同高厚比的UHTCC压缩应力-应变模型。
