【摘要】 通过测试分析不同搅拌条件和搅拌参数下混凝土的含气量和强度,分析比较不同振动方式对混凝土含气量的影响机理,并利用电镜照片和汞压法测试孔结构进行微观原理的分析。结果表明,为了提高混凝土的含气量,除了目前国内外普遍采用的掺加引气剂的方法外,合理的搅拌方式,即混凝土搅拌机的搅拌叶片在强制搅拌物料的同时,也作为振动源对物料施以振动作用的振动搅拌方式也可以显著提高混凝土的含气量;合适的振动搅拌可以使新拌混凝土含气量普遍达到3.5%左右,同时又具有较高的强度。微观原理的分析表明,振动搅拌可以促进混凝土中过渡层和水泥水化浆体的显微结构改善,还可以改善混凝土的孔结构分布,从而提高混凝土的强度和耐久性。更多还原

【Abstract】 Mixing way affects air content and durability of the concrete.Thru testing and analyzing air content and strength of concrete mixtures under various mixing conditions and data we analyzed and compared the affecting mechanism of various vibrations on the concrete’s air content while utilizing microcosmic principle analyses of stereo-scan photographs and mercury intrusion method to test the porous structure.The results show an air content increment up to 3.5%or so in the mixture through vibratory improvement and additional air-inducing chemicals,considerable high strength of the mixture,improvement in mixing blade vibration and in micro-structure of the mixture,as well as better microporous structure distribution,thus upgrading strength and durability of the concrete.更多还原