摘  要：通过等量取代碱矿渣水泥中矿渣组分与普通硅酸盐水泥中的水泥对比试验研究，探讨了采用碱矿渣水泥固结铬渣废弃物的技术优势。试验表明，当取代量为30%时，碱矿渣水泥28d固结铬渣后的Cr6+表面浸出率为0，普通硅酸盐水泥28d固结铬渣后的Cr6+表面浸出率为3.00×10-5g/cm2·d，说明碱矿渣水泥水化28d后对铬渣的固结效率远大于普通硅酸盐水泥固结效率，且用碱矿渣水泥固结铬渣废弃物的临界取代掺量可达50%。Abstract:BycomparingthetestresultsfromequivalentreplacementoftheslaginAASCorthecementofordinaryPortlandcement(OPC)withchromiumslag,theadvantagesofAASCsolidifiedbodywiththechromicresiduearediscussed.Theresultsindicatethatwhenthereplacementrateofchromiumslagis30%,thesurfaceleachingrateofCr6+inthekindofAASCsolidifiedbodyofis0,whereasthesurfaceleachingrateofCr6+intheOPCsolidifiedbodywiththechromiumslagis3.00×10-5g/cm2·dafter28dhydration,whichshowsthatthesolidificationefficiencyoftheAASCsolidifiedbodyonchromiumslagafter28dhydrationisfarbetterthanthatoftheOPCsolidifiedbody,andthecriticalreplacementrateofchromiumslagcanreachupto50%.

摘 要：对碱渣掺合料混凝土在不同条件下的耐磨性能进行了试验研究，结果表明，随着碱渣掺量的增加，碱渣混凝土的耐磨性呈现先增强后减弱的规律，当碱渣占胶凝材料10%时，混凝土耐磨性能最优。结合SEM图像分析，碱渣占胶凝材料10%时，混凝土的微观结构变得更为密实；继续增加碱渣的掺量，碱渣的耐磨性呈现大幅减弱。试验还对不同养护龄期的碱渣掺合料混凝土进行了研究，发现混凝土的耐磨性随养护龄期增长呈现增强趋势。 Abstract: The abrasion resistance of the alkaline residue concrete under different conditions are tested and studied. The results show that the abrasion resistance of the alkaline residue concrete increase firstly and then decrease with the increasing of alkaline content. The abrasion resistance of the concrete is the best when the content of alkaline residue is 10% of cementation content. Combined with SEM, it’s found that the microstructure of the concrete is more dense when the cement replacement ratio of alkaline residue is 10%, and then, the abrasion resistance of the concrete sharply decrease with the increasing the content of alkaline residue. In addition, the abrasion resistance of the alkaline residue concrete under the different curing periods is tested, and the test results indicate that the abrasion resistance of the concrete increases with the increasing of curing ages.

摘 要：选取水淬高炉矿渣为主要原料，石灰加脱硫石膏为复合激发剂，添加少量氯化钙制成全尾砂新型胶凝材料，以其完全取代矿山胶结充填中使用的胶结剂水泥。采用设计4因素3水平的正交试验，考察了石灰、脱硫石膏及氯化钙添加量对全尾砂新型胶凝材料充填体强度的影响，获得了制备全尾砂新型胶凝材料充填体28d强度的最佳配合比。结果表明，全尾砂新型胶凝材料充填体在最佳配合比条件下28d的单轴抗压强度为2.944MPa，是相同条件（浓度、胶砂比、龄期）下42.5R水泥胶凝材料充填体强度的7.5倍，可以取代水泥作为全尾砂胶结剂。 Abstract: For replacing traditional cement, a new type of whole-tailing cementitious materials is designed and prepared by using water quenching blast furnace slag as main material as well as lime desulphurization gypsum as composite activator and adding calcium chloride. Using the orthogonal design method of 4 factors×3 levels, the optimal mix proportion for preparing the whole-tailing backfill body were obtained by studying the effects of following factors, such as lime, desulphurization gypsum and calcium chloride. The results show that the 28d strength of the whole-tailing backfilling body is 2.944MPa using the optimum mix proportion, which is 7.5 times than that of 42.5R cementitious backfilling body under the same condition of concentration, cement-sand ratio and ages. Therefore, the whole-tailing cementitious material can replace cement as the cementation material.

摘 要：地铁盾构钢筋混凝土管片塑料吊装孔预埋件在城市地铁管片中得到越来越广泛的应用，根据产品特点并结合施工实际应用情况，对盾构掘进施工过程中钢筋混凝土管片塑料吊装孔预埋所出现的问题进行探析，提出一些预防和解决措施。 Abstract: Plastic hoisting holes embedded parts of the subway shield reinforced concrete segment are used more and more widely in the city subway segments. According to the characteristics of products and combined with the actual construction application, the problems arisen during the embedded process of the plastic hoisting holes are analyzed, and some preventive measures and solutions are put forward.

摘 要: 通过对某旧拱桥作细致的技术状况调查，查明缺陷（或潜在缺陷）、损伤位置及其严重程度和发展趋势，评价桥梁的使用功能。分析了主拱圈、横系梁、腹拱、伸缩缝、桥台等的病害情况。结合病害情况及检测结果，阐述该桥的维修加固设计方案，对加固施工中的锚喷混凝土施工、植筋专项施工、环氧砂浆修补裂缝施工、伸缩缝处理施工方法等进行了详细介绍。 Abstract: The technical condition of an old arch bridge is meticulously investigated to find out the defect (or potential defect), damage location and development tendency of the bridge and evaluate the use function of the kind of the bridge. The main arch rings, cross beams, spandrel arches, expansion joints, abutments and other diseases are analyzed. Combination with disease situation and test results, the repair and reinforcement schemes of the bridge are explained. And some construction methods about anchor spray cement concrete, planting reinforcing bar, repair crack with epoxy mortar, expansion joints handle, etc. are introduced in detail.

摘 要：阐述了复合土钉墙基本形式和构造特点，研究了复合土钉墙设计计算及施工技术要点，通过工程实例提出了复合土钉墙造价低、工期短、安全度高等优点，深基坑支护-截水应用经济效益显著。 Abstract: The basic form and the structure characteristics of composite soil nailing wall are elaborated, and the design calculation and key points of construction technology of composite soil nailing wall are researched. Through the engineering example, the advantages such as low cost, short construction period and high safety degree of composite soil nailing wall are put forward, and the deep foundation pit-cutting water application has the obvious economic benefit.