The changes of free solution amount, fluidity and the time-depended fluidity loss of cement paste were examined by varying the water-cement ratio and the dosages of superplasticizer. The distribution of solution and f...The changes of free solution amount, fluidity and the time-depended fluidity loss of cement paste were examined by varying the water-cement ratio and the dosages of superplasticizer. The distribution of solution and flocculation microstructure in flesh cement paste was observed with optical microscope. The change of free solution amount and its effect on the fluidity and bleeding of cement paste was studied. The results show that the adsorbed solution amount has a great influence on the com- patibility of cement-superplasticizer system, including the bleeding degree, the fluidity and the time-depended fluidity loss of cement paste. Superplasticizer increases the fluidity of cement paste by destroying the flocculated cement particle structure and increasing the amount of adsorbed solution. Polycarboxylate superplasticizer shows higher ability of adsorption than naphtha- lene superplasticizer. Over dosage of superplasticizer is not the primary cause of bleeding. The principle reason of bleeding is the high water-cement ratio and the insufficient enhancing ability of water adsorption of superplasticizer.展开更多
目的分析比较微创钻孔引流术与小骨窗开颅术治疗不同出血量的高血压基底节区脑出血的临床疗效。方法随机将118例高血压基底节区脑出血患者分为微创组和开颅组。微创组(n=61例)行微创钻孔引流手术(微创A组:34例,出血量<45 m L。微创B...目的分析比较微创钻孔引流术与小骨窗开颅术治疗不同出血量的高血压基底节区脑出血的临床疗效。方法随机将118例高血压基底节区脑出血患者分为微创组和开颅组。微创组(n=61例)行微创钻孔引流手术(微创A组:34例,出血量<45 m L。微创B组:27例,出血量≥45 m L)。开颅组(n=57例)行小骨窗开颅手术(开颅A组:28例,出血量<45 m L;开颅B组:29例,出血量≥45 m L)。分别比较两种手术方案的治疗效果。结果术后2个月,微创A组治疗总有效率88.24%,高于开颅A组67.86%,2组比较,差异有统计学意义(P<0.05);微创B组治疗总有效率(59.26%)低于开颅B组(72.41%),但组间比较差异无统计学意义(P>0.05)。结论针对高血压基底节区脑出血患者,出血量<45 m L时行微创钻孔引流术疗效更佳,出血量≥45 m L时建议行小骨窗开颅术。展开更多
基金supported by the National Natural Science Foundation of China (Grant No.50772053)
文摘The changes of free solution amount, fluidity and the time-depended fluidity loss of cement paste were examined by varying the water-cement ratio and the dosages of superplasticizer. The distribution of solution and flocculation microstructure in flesh cement paste was observed with optical microscope. The change of free solution amount and its effect on the fluidity and bleeding of cement paste was studied. The results show that the adsorbed solution amount has a great influence on the com- patibility of cement-superplasticizer system, including the bleeding degree, the fluidity and the time-depended fluidity loss of cement paste. Superplasticizer increases the fluidity of cement paste by destroying the flocculated cement particle structure and increasing the amount of adsorbed solution. Polycarboxylate superplasticizer shows higher ability of adsorption than naphtha- lene superplasticizer. Over dosage of superplasticizer is not the primary cause of bleeding. The principle reason of bleeding is the high water-cement ratio and the insufficient enhancing ability of water adsorption of superplasticizer.
文摘目的分析比较微创钻孔引流术与小骨窗开颅术治疗不同出血量的高血压基底节区脑出血的临床疗效。方法随机将118例高血压基底节区脑出血患者分为微创组和开颅组。微创组(n=61例)行微创钻孔引流手术(微创A组:34例,出血量<45 m L。微创B组:27例,出血量≥45 m L)。开颅组(n=57例)行小骨窗开颅手术(开颅A组:28例,出血量<45 m L;开颅B组:29例,出血量≥45 m L)。分别比较两种手术方案的治疗效果。结果术后2个月,微创A组治疗总有效率88.24%,高于开颅A组67.86%,2组比较,差异有统计学意义(P<0.05);微创B组治疗总有效率(59.26%)低于开颅B组(72.41%),但组间比较差异无统计学意义(P>0.05)。结论针对高血压基底节区脑出血患者,出血量<45 m L时行微创钻孔引流术疗效更佳,出血量≥45 m L时建议行小骨窗开颅术。
