This paper presents investigation results on the natural ultra-fine mineral flour of crystalline silica fume (CSF) and porous quartz sand stone (PQSS) which can modify cement mortar strength under hydrothermal synthe...This paper presents investigation results on the natural ultra-fine mineral flour of crystalline silica fume (CSF) and porous quartz sand stone (PQSS) which can modify cement mortar strength under hydrothermal synthesis reaction (HSR) in the autoclave-cured condition. The replacement of cement by CSF and PQSS can signifi cantly increase the Jflerural and compressive strength which reach 22MPa and 150MPa respectively and de-crease the porosity oj the cement mortar. The ratio oj fine aggregation, standard sand to cementions material has sig nificant influence on the mortar strength. The mechanisms involved in cement and natural mineral flour and the HSR are presented. CaO/SiO2 ratio ranges from 3. 20 to 1. 11. the main hydrate phase is C2SH and there is not Tober-morite through X-Ray diffraction qualitative analysis. The new and ultra-high strength cementious material as basic material of sleeper concrete can he used in prestressed reinforcement sleeper concrete.展开更多
在催化剂存在下,二羟甲基丙酸(DMPA)为反应单体,可成功地接枝超支化聚酯到经硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH-550)处理过的超细二氧化硅表面。通过IR、TG、氨基分析、亲水性测试等表征其性能。结果表明,每1.5 g二氧化硅和0.65 g KH-...在催化剂存在下,二羟甲基丙酸(DMPA)为反应单体,可成功地接枝超支化聚酯到经硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH-550)处理过的超细二氧化硅表面。通过IR、TG、氨基分析、亲水性测试等表征其性能。结果表明,每1.5 g二氧化硅和0.65 g KH-550反应表面氨基含量最多,为7.986 mmol/g;每1.00 g KH-550改性二氧化硅和3.00 g DMPA反应产物接枝率最高,为85.55%,产物亲油疏水性最好,使液体石蜡黏度改变最小。不同代超支化聚酯改性二氧化硅固化环氧树脂,漆膜性能表明,4.00 g DMPA改性二氧化硅固化环氧树脂漆膜铅笔硬度和柔韧性增加,改性效果最优。展开更多
基金Financially Supported by the Foundation of Science of Huazhong University of Science and Technology.
文摘This paper presents investigation results on the natural ultra-fine mineral flour of crystalline silica fume (CSF) and porous quartz sand stone (PQSS) which can modify cement mortar strength under hydrothermal synthesis reaction (HSR) in the autoclave-cured condition. The replacement of cement by CSF and PQSS can signifi cantly increase the Jflerural and compressive strength which reach 22MPa and 150MPa respectively and de-crease the porosity oj the cement mortar. The ratio oj fine aggregation, standard sand to cementions material has sig nificant influence on the mortar strength. The mechanisms involved in cement and natural mineral flour and the HSR are presented. CaO/SiO2 ratio ranges from 3. 20 to 1. 11. the main hydrate phase is C2SH and there is not Tober-morite through X-Ray diffraction qualitative analysis. The new and ultra-high strength cementious material as basic material of sleeper concrete can he used in prestressed reinforcement sleeper concrete.
文摘在催化剂存在下,二羟甲基丙酸(DMPA)为反应单体,可成功地接枝超支化聚酯到经硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH-550)处理过的超细二氧化硅表面。通过IR、TG、氨基分析、亲水性测试等表征其性能。结果表明,每1.5 g二氧化硅和0.65 g KH-550反应表面氨基含量最多,为7.986 mmol/g;每1.00 g KH-550改性二氧化硅和3.00 g DMPA反应产物接枝率最高,为85.55%,产物亲油疏水性最好,使液体石蜡黏度改变最小。不同代超支化聚酯改性二氧化硅固化环氧树脂,漆膜性能表明,4.00 g DMPA改性二氧化硅固化环氧树脂漆膜铅笔硬度和柔韧性增加,改性效果最优。
