| 摘要: |
| 采用ASTM试验标准，使用液态高效减水剂作为分散剂，通过超声波混拌将矿物掺合材在水泥净浆中均匀分散，研究了单掺不同矿物掺合材情况下水泥净浆的化学收缩和自收缩.结果表明：水胶比（质量比）为030时，单掺硅灰（SF）或粒化高炉矿渣（GGBFS），水泥净浆化学收缩和自收缩均显著增大，且其值随掺量的增加而增大；掺入偏高岭土（MK）可加大水泥净浆中后期化学收缩，降低其自收缩；掺入高钙粉煤灰（CFA）或低钙粉煤灰（FFA）可使水泥净浆化学收缩和自收缩值减小，FFA对水泥净浆化学收缩和自收缩的影响强于CFA. |
| 关键词: 化学收缩 自收缩 水泥净浆 矿物掺合材 终凝 |
| DOI：103969/j.issn1007 9629201403020 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51302020） |
|
| Chemical Shrinkage and Autogenous Shrinkage of Cement Pastewith Mineral Admixtures Added |
|
CHEN Yu, ZOU Cheng, SONG Baoshun, QIN Huan
|
|
School of Traffic and Transportation Engineering, Changsha University ofScience and Technology, Changsha 410004, China
|
| Abstract: |
| Based on ASTM standard, chemical shrinkage and autogenous shrinkage of cement paste with addition of mineral admixtures that were homogeneously blended into the matrix by ultrasonic dispenser and using superplastizer as a dispersant were measured. Test results show that with fixed water binder ratio of 030, both chemical shrinkage and autogenous shrinkage of cement paste are significantly increased by increasing replacement ratio of silica fume(SF) or granulated blast furnace slag(GGBFS). It seems that the addition of metakaolin(MK) can increase the chemical shrinkage at late age while decrease the autogenous shrinkage of cement paste. Both high calcium fly ash(CFA) and low calcium fly ash(FFA) are beneficial to reduce both chemical shrinkage and autogenous shrinkage, but the effect of FFA is stronger than that of CFA. |
| Key words: chemical shrinkage autogenous shrinkage cement paste mineral admixture final setting |
