矿物功能材料的Cl~-结合能力

测试了几种典型矿物功能材料对Cl-的初始固化力.研究表明:矿物功能材料对Cl-有较强的初始固化力,且这种初始固化力主要归因于它们对Cl-的物理吸附作用,其大小与材料的种类有关.进一步的研究发现,矿物功能材料对Cl-的初始固化力并不仅仅取决于相应比表面积的大小,同时还与各矿物功能材料的化学组成、表面结构、表面电特性及微孔特性等有关.正是由于矿物功能材料对Cl-的初始物理吸附和中、后期二次水化产物对Cl-的化学固化,从而使得高性能混凝土具有较强的Cl-结合能力

萘系高效减水剂的优化合成与改性

研究了工业萘系高效减水剂合成工艺的优化方案,得出了各合成阶段的关键工艺参数———时间、温度和原料用量的最佳控制值。尝试了一次性投酸法和用石灰代替液碱中和等新的工艺手段,前者可以简化合成工艺,但不会影响产品质量;后者不仅可以降低成本,而且所得产品除了用作减水剂,还可兼作加气混凝土的稳泡剂。对复合改性的研究发现,“萘系-糖钙”复合外加剂,既保持了显著的减水、增强效果,又达到了控制混凝土坍落度损失的改性目的

影响地下隧道衬砌混凝土抗蚀性因素的优化设计(英文)

从提高混凝土本体的密实性与防腐能力和维持钢筋钝化性能的化学环境出发,对影响地下隧道衬砌混凝土抗蚀性的主要因素进行了研究。通过对胶凝材料组分与颗粒级配、高效减水剂与新型高效钢筋阻锈剂进行优化设计,实现了对水化产物相和界面结构的调控与优化。研究结果表明:地下隧道衬砌混凝土的优化配比为5%～10%(质量分数,下同)硅灰与30%～40%大掺量粉煤灰复合内掺,1.30%萘系或1.25%聚羧酸系高效减水剂与8%还原铁粉或0.05%D–葡萄糖酸钠阻锈剂复合外掺,该多元组分混凝土满足抗渗等级>P20,氯离子扩散系数DRCM0.80的高防水抗蚀要求

海底隧道衬砌混凝土抗蚀影响因素分析与模拟

对海底隧道衬砌混凝土抗蚀影响因素进行了全面分析,建立了多因素的影响模型。指出以氯盐、硫酸盐和镁盐为代表的海洋环境介质的化学侵蚀破坏、以气候因素和盐类结晶为代表的物理因素作用、以自身结构的密实程度与收缩变形为代表的自身因素是影响隧道衬砌混凝土抗蚀性的3大主要因素。它们既相互联系又相互促进。其中,混凝土自身的密实程度和微裂缝是关键影响因素

Study on Composite Effect of Concrete Admixture

通过多种外加剂的复合 ,研究了几种以“UNF5”为主体的复合外加剂及其对改善水泥水化硬化性能的复合效应 .结果表明 ,多种外加剂的复合能同时满足混凝土的多种要求 ,具有减水、缓凝、增强、塑化等功效 ,可使混凝土快速脱模、冬季施工 ,实现早强高强The composite effect of admixtures, which are mainly composed of UNF5 admixture for modifying the hydration and hardening performance of cement, is investigated through composing several admixtures. The results show that the compound of several admixtures can meet the requirements of multiple properties such as water reduction, retardation, reinforcement and plastication so as to realize the rapid demolding and early strengthening while being in construction in winter

The Influence of Mineral Functional Materials on Chloride Ion Penetration of Concrete

在单因素影响方案的基础上 ,研究了多种磨细工业废渣及天然矿物材料的不同组合与叠加对混凝土氯离子渗透性的影响。通过试验研究和理论分析证实了硅灰与偏高岭土、粉煤灰、矿渣之间存在着“超复合叠加效应”,为合理选择矿物功能材料的种类及掺配方式 ,特别是偏高岭土的合理应用提供了技术思路 ,实现了矿物功能材料在提高混凝土抗氯离子渗透性方面的性能优化与降低成本的双重效用On the basis of the effect plan of separate addition,several kinds of ground industrial wastes and natural mineral functional materials with different combination on chloride ion penetration of concrete have been studied.The result indicates that ultra combination effect between micro silica and ultra fined,meta kaolin,fly ash,slag etc.The technical line was put for rational choosing in the kinds and component of mineral functional materials,especially in rational using of meta kaolin.Therefore double effect in which has better performance and lower manufacture cost of mineral functional materials for the anti chloride ion penetration is realized.国家“十五”攻关 ( 2 0 0 1BA30 7B0 5 - 0 8

Experiment study on mineral functional materials in improving chloride ion penetration of concrete

　对不同种类与掺量、以不同组合方式掺入的矿物功能材料对混凝土氯离子渗透性的影响进行了试验研究,结果显示:矿物功能材料对混凝土氯离子渗透性普遍有改善作用,单掺硅灰、粉煤灰、矿渣超细粉均明显改善了混凝土的抗氯离子渗透性;偏高岭土宜与硅灰组合叠加使用,适宜掺量在25%以下;不同矿物功能材料的组合叠加效果更加优于它们的单掺效果。对高性能混凝土的Cl-渗透机理分析表明,矿物功能材料由于其功能效应和对Cl-的初始固化(物理吸附)作用,从而提高了混凝土的抗氯离子渗透性能。The influences of different kinds and different amount of mineral functional material with different component on concrete's chloride penetration is studied. The result shows that mineral functional materials can universal improved concrete's chloride penetration, separate addition of micro-silica, ultra-fined fly ash and slag fines all have significantly improved concrete's anti-chloride penetration; meta-kaolin should multi-add with micro-silica together,and its suitable amount is below 25%; usually the effect of multi-added is better than that of single-added; The mechanism of chloride ion penetration in high performance concrete is analyzed,and the result indicates that there are two important reasons which increase concrete's chloride ion penetration. The one is the function effect of mineral functional material, and the other is as a result of mineral functional material's original capability of binding the chloride ion.本研究为国家"十五"攻关项目(编号2001BA307B05-08

The Influence and Application Mechanism of Mineral Admixture on Concrete Durability

本文主要研究几种矿物掺合料对混凝土耐久性能的影响,分析了矿物掺合料的作用机理。研究表明,以硅灰和经超细磨处理的水淬矿渣、粉煤灰及天然沸石粉为代表的矿物材料,作为水泥混凝土的掺合料,不仅能够利废和开发资源,而且能够明显改善混凝土的耐久性。The influence of different kind of mineral admixture onconcrete durability are discussed in this paper. On the basis, the mechanism of its application are analyzed. The research results show that the mineral admixture such as microsilica, ultrafined slag, fly ash and matural zeolite are use not only improving evidently the concrete durabilyty, but also making usr of industrial wastes and exploiting resources

一种新型微创手术机器人远心定位机构的研究

具有远程运动中心（Remote motion center，RCM）的手术机器人在微创手术（Minimally invasive surgery，MIS）领域起着至关重要的作用。综合考虑双平行四边形和双同步带RCM机构的优缺点，提出基于单同步带、单平行四边形的新型远心定位机构。基于Adams和SimMechanics分析新型RCM机构末端不动点的精度和运动空间。仿真结果表明，新型RCM机构在满足手术所需运动空间的基础上，具备更高的不动点精度，机构简单紧凑，稳定性较好