交通科技与经济
交通科技與經濟
교통과기여경제
Technology & Economy in Areas of Communications
2015年
3期
104-108
,共5页
自密实混凝土%扩展度%粉煤灰%砂率%微硅粉
自密實混凝土%擴展度%粉煤灰%砂率%微硅粉
자밀실혼응토%확전도%분매회%사솔%미규분
self-compacting concrete%slump-flow%coal ash%sand ratio%silica fume
扩展度是表征自密实混凝土填充性的一项重要指标，同时也是混凝土工作性能的重要指标。从砂率、粉煤灰用量、微硅粉掺量三方面探讨自密实混凝土扩展度大小的影响因素。试验结果表明：砂率的大小对自密实混凝土的影响主要体现在对粗骨料的润滑，本试验条件下的合理砂率约为46％；当粉煤灰含量约占胶凝材料的30％时，粉煤灰能够与水泥充分反应，自密实混凝土的扩展度达到最大；因微硅粉对混凝土拌合物起到了保水作用，减少了拌合物发生离析、泌水的几率，使得拌合物具有较好的工作性和稳定性。因此，本试验条件下微硅粉的复拌含量为粉煤灰总量的5％较为适宜。
擴展度是錶徵自密實混凝土填充性的一項重要指標，同時也是混凝土工作性能的重要指標。從砂率、粉煤灰用量、微硅粉摻量三方麵探討自密實混凝土擴展度大小的影響因素。試驗結果錶明：砂率的大小對自密實混凝土的影響主要體現在對粗骨料的潤滑，本試驗條件下的閤理砂率約為46％；噹粉煤灰含量約佔膠凝材料的30％時，粉煤灰能夠與水泥充分反應，自密實混凝土的擴展度達到最大；因微硅粉對混凝土拌閤物起到瞭保水作用，減少瞭拌閤物髮生離析、泌水的幾率，使得拌閤物具有較好的工作性和穩定性。因此，本試驗條件下微硅粉的複拌含量為粉煤灰總量的5％較為適宜。
확전도시표정자밀실혼응토전충성적일항중요지표，동시야시혼응토공작성능적중요지표。종사솔、분매회용량、미규분참량삼방면탐토자밀실혼응토확전도대소적영향인소。시험결과표명：사솔적대소대자밀실혼응토적영향주요체현재대조골료적윤활，본시험조건하적합리사솔약위46％；당분매회함량약점효응재료적30％시，분매회능구여수니충분반응，자밀실혼응토적확전도체도최대；인미규분대혼응토반합물기도료보수작용，감소료반합물발생리석、비수적궤솔，사득반합물구유교호적공작성화은정성。인차，본시험조건하미규분적복반함량위분매회총량적5％교위괄의。
Slump‐flow is an important indicator w hich can characterize filling ability and mechanical performance of self‐compacting concrete .Therefore ,sand ratio and the amount of coal ash and silica fume were taken into consideration for discussing on slump‐flow of self‐compacting concrete .Test results show that :the influence of sand ratio on self‐compacting concrete is mainly reflected in the lubrication effect of coarse aggregate ,sand ratio under the conditions of this experiment is about 46% ;When coal ash content of gel material around 30 per cent ,coal ash and cement full response ,and coal ash "ball" have also been fully acted ,slump‐flow of self‐compacting concrete scaled to the maximum ;The silica fume of concrete mixed together and worked together with the water ,which could reduce the probability of segregation and bleeding ,a good working and stability of mixture were realized .Therefore ,5% is suitable for the ratio of silica fume and coal ash under the experiment .
