摘 要：将二水石膏、胶粉、纤维素醚等原料对建筑垃圾再生砂进行膜化处理制备水泥砂浆，通过正交试验和方差分析研究了二水石膏、胶粉、纤维素醚对其性能的影响，得出了抗压强度效果最好的膜化配比为4%石膏、2%胶粉和0.6%纤维素醚，抗折强度效果最好的膜化配比为4%石膏、1%胶粉和0.2%纤维素醚，三种因素对其吸水率影响不大。试验结果表明，经膜化处理建筑垃圾制备的水泥砂浆的性能要优于未处理的建筑垃圾制备的水泥砂浆。 Abstract: The dihydrate gypsum, powder, cellulose ethers and other raw materials are used for construction waste reclaimed sand membrane treatment and preparation of cement mortar, and the effect of dihydrate gypsum, powder, cellulose ethers on performance of cement mortar is studied by the method of orthogonal level analysis and variance analysis. The results show that the membrane proportion of mortar with the best compressive strength is 4% gypsum, 2% powder and 0.6% cellulose ether, the membrane proportion of mortar with the best flexural strength is 4% gypsum, 1% powder and 0.2% cellulose ethers, three factors have little effect on its absorption. The test results show that the performance of cement mortar treated by membrane treatment is superior to that of cement mortar untreated.

摘  要：研究了氢氧化钙、石膏、硫酸钠三种激发剂对钢渣-矿粉胶凝材料力学性能的影响，并结合XRD图谱分析了激发剂对钢渣-矿粉胶凝材料水化产物的影响机理。试验结果表明，三类激发剂中，硫酸钠能更好的激发钢渣-矿粉的活性，当硫酸钠的掺量为1.5%时，3d强度为18.0MPa，7d强度达到22.5MPa，28d强度达到25.8MPa。XRD分析表明，掺入硫酸钠后，钢渣-矿粉胶凝材料的水化产物主要为C-S-H凝胶、棒柱状AFt晶体及少量的Ca（OH）2晶体，激发剂掺量的不同，水化产物数量不同，合适掺量的激发剂有助于激发体系的水化活性，提高体系的力学性能。Abstract:Effectofthreekindsofactivator（calciumhydroxide,gypsumandsodiumsulfate）onthemechanicalpropertiesofsteelslag-slagpowderisstudied.HydrationproductsofthematerialsareinvestigatedbyXRD.Theresultsshowthatcomparedwiththecalciumhydroxideandgypsum,sodiumsulfatecanstimulatetheactivityofsteelslag-slagpowdermoreeffectively.WhenthecontentofNa2SO4is1.5%,3dcompressivestrengthis18.0MPa,7dcompressivestrengthis22.5MPaand28dcompressivestrengthachieves22.5MPa.XRDanalysisshowsthathydrationproductsaremainlycomposedofC-S-Hgel,AFtandCa(OH)2crystals.Theamountofhydrationproductsischangedalongwithdifferentcontentofactivators.Appropriatecontentofactivatorishelpfultothehydrationactivityofthesteelslag-slagpowdersystem,alsocanimprovethemechanicalproperties.

摘 要：为了实现合理利用粉煤灰、镁渣等工业废渣，提高混凝土抗碳化性能，以镁渣掺量、镁渣消解时间和粉煤灰掺量为因素，设计正交试验L9(34)方案及单因素试验方案，试验研究镁渣混凝土的碳化规律。试验表明，镁渣具有增加碱性储备和补偿收缩变形的双重效应，能显著提高C30混凝土的抗碳化性能，碳化深度与镁渣掺量呈幂指数关系，与碳化时间呈双曲线关系。镁渣和粉煤灰都是影响混凝土碳化性能的重要因素，镁渣消解时间的影响很小，是次要因素。就碳化而言，可以取消镁渣消解环节，简化镁渣混凝土的生产工艺。 Abstract: In order to realize the reasonable utilization of industrial residue such as fly ash, magnesium slag and so on and enhance the carbonation performance of concrete, taking magnesium slag content, magnesium slag digestion time and fly ash content as factors, the orthogonal test L9(34) and the single factor test scheme were designed to research the carbonization law of magnesium slag concrete. The result shows that: magnesium slag has double effects increasing alkaline reserve and compensating shrinkage deformation, and can significantly improve the carbonation performance of C30 concrete; the carbonation depth is the exponential relationship with magnesium slag content, the hyperbolic relationship with carbonization time. Magnesium slag and fly ash are important factors affecting carbonization performance of concrete. The magnesium slag digesting time which is a minor factor has little effect on carbonation. In terms of carbonization, magnesium slag digestion can be cancelled to simplify the production process of magnesium slag concrete.

摘 要：概述了混凝土无缝施工技术在沧州民防工程中的应用，该工程通过设置膨胀加强带利用补偿收缩混凝土等技术，达到了理想的效果。 Abstract: The application of concrete jointless construction technology in Cangzhou civil defense engineering is summarized. And the project achieves an ideal effect by setting expansion reinforcing band and using shrinkage-compensating technology.

摘 要：FMECA方法具有数据简单、处理直接、应用潜力大等优点，故将其引入到施工风险管理中。本文选取钻孔灌注桩为例分析建筑施工风险，采用FMECA中的风险优先数方法，将风险衡量因子扩展为“发生概率”、“危害程度”和“可检测度”三个因子，对钻孔灌注桩施工风险进行半定量分析，提出更客观的防治措施，进而验证了FMECA方法在施工风险分析中的有效性。 Abstract: The FMECA method has the advantages of simple data, direct processing and great application potential, so it will be introduced to the construction risk management. Here, construction risk is analyzed by taking a bored pile as an example, and using risk priority number method of FMECA, the risk measure factor is expanded to three factors (occurrence probability, damage degree and detectability). Meanwhile, semi-quantitative analysis of construction risk of bored piles is took, more objective measures are put forward, and then verify the effectiveness of FMECA method in the construction risk analysis.

摘 要：分析了管桩模具的工作条件及损坏形式，指出了目前模具跑轮修复方法的不足，提出了利用自动堆焊设备修复管桩模具跑轮的工艺技术。研究表明，采用该工艺修复模具跑轮可大幅度提高修复效率，修复后模具的使用寿命甚至优于新模具。 Abstract：The working conditions and damage forms of the pile mould are analyzed, the shortages of the running wheel repair method for current moulds are point out, and the technology on using automatic welding equipment to repair mould running round of is put forward. The research shows that using the new technology to repair mold running wheels can greatly improve the efficiency of repair, even after repairing service life of mould is superior to that of the new mould.