| 1. | Analysis of concrete shrinkage based on the micro - pore structure model
基于孔结构模型的混凝土干缩变形理论分析 |
| 2. | Action mechanism and effect of application of concrete shrinkage reducing admixture
混凝土减缩剂的作用机理及其应用效果 |
| 3. | It is very important for reducing and compensating concrete shrinkage and preventing cracks forming to construction and curing
施工和养护对混凝土抗裂防渗性能有重要影响；对于复合抗裂防水高性能混凝土，湿养护时间不宜低于14天。 |
| 4. | The expansive experiment shows steel slag can compensate the concrete shrinkage during a long time and hybrid fiber restrains the concrete shrinkage
钢渣掺合料对混凝土收缩具有长期补偿作用，混杂纤维起到抑制混凝土收缩的作用。 |
| 5. | The result of test shows it is not accurate to estimate concrete shrinkage if the early - age shrinkge is ignored , since the early - age shrinkge comprises the most part of the whole shrinkge
试验结果表明：混凝土早期收缩占混凝土总收缩较大的比例，忽视这种收缩不能准确反映混凝土收缩本质。 |
| 6. | ( 3 ) this thesis deduces the predigestion calculating method for calculating the section stress redistributed by the effects of concrete shrinkage , creep and difference temperature of pre - stressed lager cantilever composite beam with corrugated steel webs
( 3 )推导了预应力波形钢腹板组合挑梁关于徐变、收缩及温度效应下的截面应力分布简化计算方法。 |
| 7. | This part is investigated in this paper . what ' s more , a new type admixtures - shrinkage - reducing admixture is also studied with respct to the concrete shrinkage . results indicates that expansive admixture and shrinkage - reducing admixture both decrease early - age shrinkage , but the shrinkage - reducing admixture has the merits of more stable shrinkage - reducing ratio , lower drop in elavation of shrinkage , more substantial reduction in overall shrinkage and so on
此外，减缩剂是一种专门用于减少混凝土干燥收缩和自收缩的新型外加剂，本文也研究了其对混凝土收缩作用效果，试验结果表明：膨胀剂和减缩剂都具有改善混凝土早期收缩的作用效果，但同膨胀剂相比，减缩剂具有减缩稳定，收缩落差小易适应变化，改善效果更明显等优点。 |
| 8. | The result of macro - quality experiments show : mineral admixtures markedly slow the hydrating velocity of cement slurry , decrease and delay the hydrating max - temperature , in which steel slag is more effective ; expansive agents compensate concrete shrinkage , enhance the concrete dense degree , strengthen the interfacial layer between fiber and cement matrix and improve the physical mechanics qualities of acic ; minimal admixtures markedly improve the concrete workability property , increase the concrete later intensity & density and the capability of anti - chemical attack and anti - permeability ; hybrid fiber reinforces the toughness of obviously acic by the means of anti - cracking effect of fiber with different sizes and different properties in the corresponding construction levels
实验结果显示：钢渣掺合料能显著减缓水泥浆体水化速率，降低砂浆的水化温升并延迟最高温升时间；补偿混凝土收缩，提高混凝土密实度，加强纤维与水泥石的界面粘结，增强混凝土力学性能，但不能明显改善混凝土韧性。混杂纤维通过纤维的不同尺度与不同性质在相应的结构层次上产生阻裂效应，增韧钢渣防渗抗裂混凝土；增加混凝土的破坏极限能，极大提高混凝土抗弯曲能力和韧性指数，改善混凝土脆性。 |
| 9. | In this paper , the influences on concrete shrinkage and splitting tensile strength by the varieties and contents of the raw materials , such as cement , sand , fly ash , water - reducer and expansion agents , are studied . the possibility of the prevention of the concrete cracking by proper concrete proportion design is discussed
本文着重研究了水泥、砂、粉煤灰、减水剂、膨胀剂等材料的品种、用量对混凝土收缩性能及混凝土劈裂抗拉强度的影响，探讨了通过合理的配合比设计达到减少混凝土收缩、提高混凝土劈裂抗拉强度进而降低混凝土开裂风险的可能性。 |
| 10. | Through the theoretical calculation and parameter analysis and compared the result with general composite beam , the results show that the section stress redistributed by the effects of concrete shrinkage and creep and tensile stress by difference temperature will be greatly reduced . the forcing characteristic of this
通过理论计算和有限元参数分析,与常规组合结构进行对比,验证了预应力波形腹板组合结构具有大大减小徐变引起的应力重分布及温差和收缩效应在混凝土板产生的拉应力值、对加载龄期和持荷龄期不敏感的特点,结构受力性能非常优越。 |
