ZYG-Ⅳ自流平无收缩高强灌浆料支座砂浆在高速铁路工程中的运用

在比较分析ZYG-Ⅳ自流平无收缩高强灌浆料支座砂浆和环氧树脂砂浆特征、使用方法的基础上,介绍了ZYG-Ⅳ自流平无收缩高强灌浆料支座砂浆在京沪高速铁路工程应用中的优势。     

钢丝网外喷高强砂浆加固钢筋砼梁的试验研究

研究了一种新型的加固方法，即用钢丝网外喷高强砂浆加固钢筋混凝土梁，并进行了11根加固试件与未加固试件的静荷载对比试验。结果表明，加固后试验梁的受弯承载能力明显提高，梁的刚度提高较大，减小了裂缝宽度且对裂缝的发展具有明显的抑制作用，高强砂浆与原混凝土间粘接牢靠且两者能够协同工作。     

太原市检查井的管理与维护现状及对策建议

针对当前太原市检查井的管理与维护现状，指出了检查井管理和维护方面存在的问题，提出了新形势下检查井管理与维护的新模式。     

钢筋钢丝网砂浆加固砖砌薄墙的抗弯性能

目前,60mm厚的砖砌薄墙已广泛应用于各类建筑。作为隔断墙,可以节省空间,然而施工中几乎不做拉结等处理,使得其安全性（如地震作用下的倒塌）令人担忧。为既提高砖隔墙的安全性,又不较大增加其截面尺寸,提出用钢筋钢丝网砂浆加固砖砌薄墙抗弯性能的思路。共制作了9片砖墙进行对比试验研究,分析了加固墙体的开裂荷载和极限承载力,观察墙体破坏特征。试验研究结果表明,钢筋钢丝网砂浆能有效地约束加固层砂浆及砖墙,显著提高砖墙抗弯承载力,砂浆和砖块不发生大块剥落,本文还提出了钢筋钢丝网砂浆加固砖砌薄墙的抗弯承载力计算公式。     

宾汉姆体的缓凝砂浆在单螺杆挤出机中的流动

在实验的基础上，研究了宾汉姆体的缓凝砂浆在单螺杆挤出机中的流动；运用流变学理论， 建立了缓凝砂浆螺旋输送物理模型；对缓凝砂浆螺旋输送与包裹机构的工作机理进行了分析 与研究，得出了缓凝砂浆连续输送的条件，螺杆转速必须大于临界转速. 实验发现：宾汉姆 体的缓凝砂浆在螺旋输送与包裹机构中当螺杆转速在78$\sim$240\,r/min范 围内可实现连续输送和包裹.     

Identification of the Physical Parameters Used in the Thermo-Hygro-Mechanical Model

This paper describes different methods used to identify a large number of physical parameters of the thermo-hygro-mechanical coupling model. This model is developed on the basis of mechanics of porous media and deals with the prediction of response of a structure submitted to thermal, hygrometric and mechanical loading. The aim of this work is mainly to propose some experimental methods for the determination of physical parameters used previously in the model such as hygrometric parameters (liquid Biot's coefficient b _l , vapour and liquid permeability _v, _l and tangent capillary modulus N _ll). Thermal parameters such as thermal conductivity (), specific heat (C) and the thermo-hydrous expansion coefficient ( _i ^p ) have been identified using some works published previously. The different physical parameters were identified in the case of cement mortar without taking into account the influence of hysteresis.     

水泥砂浆的一个热粘弹性率型损伤本构模型

利用SHPB实验系统及自行研制的混凝土类材料快速高温加热设备,对水泥砂浆试件进行了不同 温度(20~600℃)和3种冲击速度下的实验,得到了不同温度和冲击速度下水泥砂浆试件的应力应变关系曲 线。基于ZWT粘弹性本构模型,并且考虑高温下水泥砂浆损伤演化规律都服从Weibull分布,提出了一个水 泥砂浆的热粘弹性率型损伤本构模型。通过数据拟合,获得了本构模型的相关参数,结果表明:理论预测和实 验结果吻合良好。     

Comparative Study of Different Measurement Methods for Characterizing Rheological Properties of Lubrication Layer

The lubrication layer plays a governing role in predicting the pumpability of fresh concrete. To determine the effect of measurement methods on the characterization of the rheological properties of the lubrication layer, different measurement systems, including Sliper, tribometer, and the utilization of a mortar rheometer, were employed. The rheological properties and workability of bulk concrete were measured in parallel to investigate the correlation between them and the rheological properties of the lubrication layer. The results show that the measured values of the rheological parameters of the lubrication layer differ due to the systematic deviation between different measurement methods. The results obtained by both tribometer and mortar rheometer were well-correlated, having a linear relationship with the rheological parameters of bulk concrete. The correlation coefficient between results gained with Sliper and rheological parameters of concrete or lubrication layer determined with other methods was not high enough. Addition friction led to the large accidental error and overestimated yield stress obtained with Sliper. The workability of concrete is only suitable for characterizing the rheological properties of bulk concrete.     

一种Mortar型旋转Q1元方法

提出了一种mortar型旋转Q1元方法,相应的mortar条件仅依赖于子区域边界上的自由度;并得到了较优的误差估计.     

水泥砂浆石在准一维应变下的动态力学性能研究

以改进的SHPB被动围压试验方法 ,研究了水泥砂浆石在准一维应变下的动态力学响应。分析讨论了试验结果与围压套筒材料性质、几何尺寸等的关系。得到了水泥砂浆石的动态泊松比、动态杨氏模量、动态压缩强度。分析了试验中的摩擦力效应及其对围压下轴向应力应变关系的影响 ,完成了对材料弹性常数的修正。