摘 要：以建筑垃圾再生砖为研究对象，进行了单轴压缩试验，拟合了应力-应变曲线，采用扫描电镜（SEM）对再生砖的细观结构进行观测，利用工业CT获得了再生砖压缩破坏过程中的裂纹分布特征，并借助分形理论进行分析裂纹演化特征。研究结果表明：建筑垃圾再生砖具有较大的孔隙率，存在诸多的初始缺陷，裂纹容易最先在这些薄弱环节出现。水泥石将骨料包裹起来形成筋络结构可分割破坏区，延缓裂缝的伸展及汇聚过程，可有效提高再生砖的强度。同时再生砖具显著的不均匀性，在荷载作用下不同断面的分形维数的变化规律有较大的差异，断面上平均强度越高，分形维数的变化越平缓，反之则变化要更剧烈，但整体物理性能与混凝土是相似的。CT和SEM结合可有效地对建筑材料的微观结构和破坏机理进行分析，为进一步揭示再生砖的细观损伤破裂机理奠定基础。 Abstract: Based on the uniaxial compression test of construction waste recycled brick, the stress-strain curve was fitted, and the microscopic structure of recycled brick are observed by SEM. Crack distribution characteristics in the process of recycled brick compression failure were gained by using industrial computed tomography (CT), and the crack evolution characteristics were analyzed by means of fractal theory. The researches indicate that: construction waste recycled bricks have larger porosity, it exists many initial defects in the recycled aggregates, in these weak links cracks easily appears first and face to internal development of the cement matrix. Aggregates are wrapped by the cement matrix and only to form the sinew structure of separable damage zone, the cracks extension and the convergence process are delayed, the strength of the recycled brick can be efficiently improved. Meanwhile, recycled brick has the inhomogeneity, it exists some differences that change rules of the fractal dimension about different cross section in the load condition are major, the average strength higher, the fractal dimension changes more gently, the opposite changes are more severe, but the overall physical properties and the deformation regularity of under uniaxial loading is similar with those of concrete; the microstructures of construction materials and failure mechanism are analyzed by CT and SEM, which lays a foundation for further revealing the microscopic damage fracture mechanism of the recycled brick.

摘  要：以硅钙渣、粉煤灰、脱硫石膏等为原料制得了托贝莫来石型（5CaO·6SiO2·5H2O）硅酸钙板。研究表明，硅钙渣掺量不高于50%时，有助于硅酸钙板强度的提高，粉煤灰和硅钙渣之间存在相互协同所用，只有二者的配比适当时硅酸钙板的性能才能够达到最佳。Abstract:Thecalciumsilicateboardwithtobermorite(5CaO·6SiO2·5H2O)waspreparedbyusingsilicium-calciumslag,flyashanddesulfurizationgypsumasrawmaterials.Thestudyshowsthatthestrengthofcalciumsilicateboardcanbeimproved,whenthesilicium-calciumslagcontentislowerthan50%,andthereisamutualconcurrenteffectbetweenwithflyashandsilicium-calciumslag.Sothecalciumsilicateboardcangetthebestproperties,onlyifproportionofflyashandsilicium-calciumslagisappropriate.

摘 要：结合某商品混凝土公司遇到的几个混凝土工程案例的裂缝问题，分析了混凝土裂缝产生的原因，提出的相应预防处理措施，可有效控制和减少混凝土裂缝的产生，并为类似工程提供借鉴。 Abstract: Combining with the crack problems of several concrete engineering cases of a commercial concrete corporation, the causes of cracks on the concrete are analyzed, and crack preventive measures are put forward, so that the concrete cracks are effectively controlled and reduced. The measures can provide a reference for the similar engineerings.

摘 要：为研究影响压力分散型悬锚式挡土墙承载力的相关因素及耐久性评价，采用FLAC 3D软件对实体挡土墙工程进行了数值模拟仿真计算。对影响压力分散型悬锚式挡土墙承载力的主要因素进行了控制分析。数值计算结果表明：土压力呈非线性分布，并随填土高度的增加而增大；挡土墙在竖向和水平向都存在明显的土拱效应；锚杆存在最佳的设置高度和竖向间距；预应力对提高压力分散型挡土墙承载力的效果不显著；增大填料的粘聚力会提高压力分散型悬锚式挡土墙的承载力；挡土墙的耐久性好，在土体强度发生较大的衰减及水环境下仍可保持稳定。 Abstract：In order to study the influencing factors and durability of bearing capacity for pressure dispersion suspended-anchor retaining wall, FLAC 3D software was used to simulate retaining wall engineering. The main factors influencing the bearing capacity of the earth retaining wall were controlled and analyzed. The results show that the distribution of soil pressure is nonlinear, and soil pressure increases with the increasing of filling height. Soil anchoring effects of retaining wall is obvious in vertical and horizontal direction. Anchor has the optimal setting height and vertical spacing. Prestress has little effects on increasing the bearing capacity of the retaining wall. Filler with high cohesion can improve the bearing capacity of the retaining wall. The durability of the retaining wall is good, and the retaining wall has high stability with the environment of great soil strength attenuation and water erosion.

摘 要：随着社会的发展，超高层建筑越来越多，型钢混凝土结构能够极大的减少混凝土柱截面尺寸，因此普遍应用在超高层建筑中。本文阐述了钢柱柱脚与混凝土底板之间二次灌浆的施工工艺及操作要点，可确保型钢柱脚灌浆的密实性，保证工程施工质量。 Abstract: With the developing of society, super high-rise buildings are becoming more and more popular. Because steel reinforced concrete structure can greatly reduce the concrete column section size, it is widely used in super high-rise buildings. Here, the secondary grouting construction technology and operating essentials between the steel column foot and concrete slabs are expounded to ensure the compactness of grouting of steel column foot and the construction quality.

摘 要：提出了降低管桩滚焊机能耗、提高生产效率和焊接质量以及延长设备耐久性的具体措施。实践表明：通过实施以上措施，管桩滚焊机的节能效率和生产效率显著提高，焊接质量明显改善，设备的耐久性也得到延长。 Abstract：Some improve measures of reducing the energy saving of roll welder for piles, improving production efficiency and welding quality and prolonging the durability of roll welder are put forward. The practice shows that by implementing the above improvements on the roll welder, energy efficiency and production efficiency of the roll welder increase significantly, welding quality markedly improves, and the durability of equipment are prolonged.