摘 要：概述了赤泥的物理性质、化学组成和矿物组成，研究了赤泥在混凝土中的应用。研究表明，赤泥作为矿物掺合料，当掺量为20%时，可以改善赤泥-水泥体系的抗折强度，又不会对抗压强度造成过大损失；在水泥用量相同时，双掺赤泥和粉煤灰体系的强度要高于单掺赤泥或粉煤灰体系的强度；碱激发剂有利于双掺体系强度的增长。 Abstract：The physical properties, chemical components and mineral composition of red mud are summarized, and the application of red mud in the concrete is studied. The study indicates that red mud as a kind of mineral admixtures can improve the flexural strength of red mud-cement system and will not have a significant impact on the compressive strength when content of red mud is 20%; the strength of red mud-ash-cement system is generally higher than that of red mud-cement system and fly ash-cement system under the same amount of cement. The alkaline activator can improve the strength of red mud-fly ash-cement system.

摘 要：在砂浆中混掺钢屑和铁砂两种工业废弃料，制备得到环保低成本的水泥基复合材料，在测定其抗压强度的基础上采用交流两电极法研究其导电性能和压敏性能，并分析研究了混掺掺量、弹塑性荷载、不同加载速率以及冲击荷载等对其压敏性的影响。试验结果表明，随着导电材料掺量增加，试件压敏性更加明显。加载速率越大，试件电阻率变化越大；冲击荷载数值对瞬间电阻率与卸载后电阻率均有较大影响。 Abstract：Two industrial waste materials of steel crape and iron sand were mixed to add into cement system to produce cement based composite material that was low cost and environment friendly. Its conductivity and varistor properties were studied by AC two wire method on the basis of the compressive strength test. And the effect of conducting waste contents, elastic-plastic loads, the various load rate and impact loads on the compression sensitivity of the composite material was studied and analyzed. The test results show that cement-based composite material has favorable varistor properties. With the increase of conducting material contents, the varistor properties of the composite material is more obvious; the greater the loading rate, the greater the resistance changes; the larger the impact load, the faster the resistivity falls.

摘 要：介绍了某住宅工程项目中预制装配式混凝土外墙的施工应用，并就其深化设计、生产制作、运输、吊装、安装等方面的施工工艺技术进行了分析和研究，结合该工程施工中的经验和教训，对于预制装配式混凝土外墙施工技术在建筑工业化中的应用提出了建议。 Abstract：The construction application of the prefabricated concrete external wall in a residential project is introduced, and its deepening design, production, transportation, hoisting and installation of construction technology are analyzed and studied. In addition, combined with the experiences and lessons in engineering construction, some suggestions on the application of prefabricated concrete external wall construction technology in the building industrialization are put forward.

摘 要：为探讨顶管法施工时造成的土体扰动，以合肥市某顶管工程为背景，运用理论分析与数值模拟相结合的方法对施工时的地层应力场、位移场及地表隆沉的变化过程和分布规律进行了研究并对地表位移进行了监测。结果表明，顶管施工时管道周围一定范围内的土体会受到扰动，管道底部、腰部分别出现最大竖向拉应力、最大竖向压应力；管道上方的土体扰动区域大于下方土体，管道底部和顶部位置土体分别出现最大隆起和最大沉降，随着管道的顶进隆起值减小而沉降值增大，管道轴线远处土体的位移基本为零；地表隆沉曲线以管道轴线为对称轴近似正态分布，在掌子面前方地层表现为隆起而后方为沉降状态。 Abstract：In order to investigate the soil disturbance caused by the pipe jacking construction, the soil stress-displacement field and surface deformation during construction were studied with theoretical and numerical simulation methods based on a pipe-jacking project in Hefei and the surface displacement was monitored. The results show that the soil is disturbed in a certain range around the pipe while the pipe jacking, the maximum vertical tensile stress and the maximum vertical compressive stress are in the bottom and the middle of the pipe respectively; the disturbance area above the pipe is bigger than that of the below. The maximum uplift an settlement are in the top and the bottom respectively, the upheaval decreases while the settlement increases with the pipe jacking, the displacement of soil far from the pipe axis is about zero; the surface deformation curves is approximate a normal distribution whose symmetry axis is the axis of the pipe, the soil layer uplifts in front of tunnel face, then settles behind it.

摘 要：通过正交试验研究了生产砌块用再生混凝土的热工性能，利用极差分析影响再生混凝土导热系数的因素，找出了再生混凝土热工性能各因素的影响规律，并结合再生混凝土砌块强度要求，优化了组合各因素水平取值，给出了再生混凝土砌块具有较好热工性能及较高抗压强度的配合比。在此基础上，进行了再生混凝土砌块墙体的传热系数性能试验研究，结果表明，再生混凝土砌块墙体与普通墙体相比具有良好的热工性能。 Abstract: The thermal performance of recycled concrete block is studied by orthogonal experimental and the main influence factors on thermal conductivity of recycled concrete is analyzed using range analysis in order to find the influence law of the factors on thermal performance of recycled concrete. The values of various factors are optimized based on the strengths of recycled concrete block, the optimum mix proportion of recycled concrete block with great thermal performance and relatively high compressive strength is obtained. On this basis, heat transfer performance of recycled concrete block wall is tested. The results show that the thermal performance of recycled concrete block wall is better than that of ordinary wall.

摘  要：采用正交试验设计方法，考虑水泥掺量、玻化微珠掺量、植物纤维参量及砂掺量四个因素在三个水平下的影响，配置植物纤维增强型玻化微珠陶粒混凝土砌块，对材料抗压强度、拉压比和导热系数进行了极差分析、方差分析，采用功效系数分析法，确定满足一定考察指标的材料最优配合比。结果表明：水泥掺量是影响抗压强度的最主要因素，也是最显著因素；植物纤维能有效地提高材料的拉压比；玻化微珠能够较好地改善材料的热工性能，其掺量对于抗压强度及拉压比的影响较小。提出了抗压强度在5.0～7.5MPa范围内的最优配合比。Abstract:Byusingthemethodoforthogonalexperimentaldesignandconsideringtheinfluenceofcementcontent,glassbeadscontent,plantfiberparametersandsandcontentunderthreelevels,glazedhollowbeadandhayditeconcreteblockwithplantfiberwasprepared.Throughrangeanalysis,analysisofvariance,andtheefficiencycoefficientanalysisofcompressivestrength,tension-compressionratioandthermalconductivityoftheblockmaterial,theoptimummixproportionwhichmakesblocktosatisfycertainindicatorisdetermined.Theresultsshowthatcementcontentisnotonlythemostimportantfactoraffectingthecompressivestrengthofmaterial,butalsothemostsignificantfactor;addingplantfibercaneffectivelyimprovethetensionandcompressionratioofmaterial;addingglassbeadscanimprovethethermalperformanceofmaterial,butitscontentwaslessaffectedforcompressivestrengthandtensionandcompressionratioofmaterial.Theoptimummixproportionisputforwardtoget5.0～7.5MPaofcompressivestrength.