摘 要：基于正交试验，以再生微粉、脱硫石膏、矿渣和钢渣为主要原料，并复掺少量激发剂，探讨了各种矿物成分掺量对新型无熟料胶凝材料强度、安定性、标准稠度需水量和凝结时间的影响，找出了与32.5级复合水泥强度等级相当的无熟料胶凝材料的配合比，并得到了各矿物组成的最佳配合比设计。同时，分别研究了养护条件对不同强度的新型无熟料胶凝材料的影响，当配合比中钢渣含量低于15%时，在标准条件下养护效果最好；当钢渣含量高于15%时，在空气中的养护效果最好。 Abstract: Based on orthogonal test, renewable powder, desulfurized gypsum, slag and steel slag as the main raw material, mixed appropriate amount of activator, the influence of various mineral ingredients dosage on strength of new type binding material without cement clinker, stability, water requirement of standard consistency and setting time is discussed. The intensity level reached 32.5R strength grade mixing ratio of cement is found, the best of mix design for mineral composition is obtained. At the same time, the effects of curing conditions on different strength of new type binding material without cement clinker is studied. When the mix ratio of steel slag content is less than 15%, curing effects is the best under normal standard; when the content of steel slag is higher than 15%, curing effect is the best in the air.

摘  要：采用建筑垃圾中的废弃混凝土制备出Ⅰ类品质再生粗骨料，并按照不同的取代率替代天然粗骨料制备再生混凝土，研究了不同水泥用量体系下Ⅰ类品质再生粗骨料的取代率对再生混凝土抗碳化性能的影响。结果表明，再生混凝土的抗碳化性能随着再生粗骨料取代率的降低和水泥用量的增加而逐渐增强，且逐渐接近于天然骨料混凝土；当水泥用量为500kg/m3且取代率为60%时，其碳化深度相比天然骨料混凝土仅增加0.3mm；再生混凝土中再生粗骨料的取代率不宜过高，最大取代率宜选择在40%～60%之间。Abstract:TheclassⅠrecycledcoarseaggregateispreparedbyusingthewasteconcreteinconstructionwaste,andinaccordancewithdifferentsubstitutionrateofnaturalcoarseaggregateispreparedrecycledconcrete,theeffectofreplacementratioofclassⅠrecycledcoarseaggregateonthecarbonationresistanceofrecycledconcreteindifferentcementdosagesystem.Theresultsindicatethatthecarbonationresistanceofrecycledconcreteincreasesgraduallywiththedecreasingreplacementrateofrecycledcoarseaggregateandtheincreasingcementdosage,andisclosingtothenaturalaggregateconcrete;whenthedosageofcementis500kg/m3andreplacementrateis60%,thecarbonationdepthincreasesonly0.3mmwhichiscomparedwithnaturalaggregateconcrete;andthereplacementrateofrecycledcoarseaggregateinrecycledconcreteshouldnotbetoohigh,themaximumreplacementratecanchoosebetween40%～60%.

摘 要：将钢渣细粉掺入煤渣砖中，测量其氡析出浓度和抗压强度，研究了钢渣加入煤渣砖后的氡污染情况，钢渣硬度高、表观密度大、放射性弱，钢渣细粉可填充煤渣砖的内部孔隙，形成了致密的结构，并且有足够数量的白色结晶形成，对煤渣砖中的氡有一定的屏蔽效果，钢渣本身对氡污染的贡献不多。钢渣细粉具有一定的活性，对煤渣砖的抗压强度产生影响，在钢渣加入量为35%时，抗压强度达到最大，此时的氡析出浓度也较低。 Abstract: Adding steel slag powder into coal cinder bricks, concentration of radon exhalation and compressive strength are measured, radon contamination with steel slag is studied after joining coal cinder block. With high hardness, great apparent density, weak radioactive, steel slag powder can fill internal pore of cinder brick module, then form dense structure, and have enough white crystalline form, shielding effect of radon in coal cinder bricks is obtained, the steel slag itself on the contribution of radon pollution is not much. Steel slag powder has a certain activity, which has effect on compressive strength of coal cinder bricks, in the amount of steel slag is 35%, compressive strength is maximum, the concentration of radon exhalation is low.

摘 要：以实际工程为例，利用结构分析软件建立了数值仿真分析模型；对渡槽混凝土温度及应力进行了分析，并提出了相应的防裂措施；可为类似薄壁混凝土渡槽结构的施工提供借鉴和理论依据。 Abstract: As a example for a actual project, numerical simulation model is established by using structure analysis software; the analysis on temperature of concrete of aqueduct and stress are carried out, and the anti-cracks measures are proposed. Reference and theoretical basis of construction for thin concrete box aqueduct structure are provided.

摘 要：为了改善石膏墙体材料的力学性能，分别采用Y型束状单丝聚丙烯纤维和高强高模聚乙烯醇短纤维作为建筑石膏的增强材料，通过力学性能测试研究了纤维长度和掺量对石膏基复合材料力学性能的影响。结果表明，添加聚丙烯纤维对复合材料力学性能为负面影响，不能直接用于现浇石膏隔墙体系。添加聚乙烯醇纤维对复合材料力学性能有改善作用，纤维长度为9mm，掺量为1.5%时，试样的绝干抗折强度和吸水饱和抗折强度较空白试样分别提高了82.5%和83.9%，抗压强度略低于空白试样。结合弯曲荷载-变形曲线，分析了聚乙烯醇纤维增强石膏基复合材料的断裂机理，结果表明：断裂过程分为基体断裂弹性受力、纤维拔出、破坏三个阶段，纤维与基体的界面黏结能力是纤维抗拉强度能否充分利用的关键。 Abstract: In order to improve the mechanical properties of gypsum material, Y bundle monofilament polypropylene fiber and high elasticity polyvinyl alcohol fiber are respectively used as reinforced material of building gypsum. The effect of fiber length and fiber content on mechanical properties of gypsum based composite materials is studied by mechanical properties test. The results show that, the effect on mechanical properties of composite material by adding polypropylene fiber is negative, and polypropylene fiber can't be applied directly in cast-in-site gypsum partition wall system. Mechanical properties of the composite material can be improved by adding polyvinyl alcohol fiber. When the length of polyvinyl alcohol fiber is 9 mm, the content is 1.5%, the dry flexural strength and water saturated flexural strength of specimen compared with the blank sample are increased by 82.5% and 83.9% respectively, the compressive strength is slightly lower than the blank sample. Combined with the bending load-deformation curve, the fracture mechanism of polypropylene fiber reinforced gypsum based composite material is analyzed. The results show that, the fracture process can be divided into 3 stages: the base material fracture elastic stress stage, fiber pull-out stage and failure stage, the interface bonding capacity between fiber and matrix is the key factor for making the best use of fiber tensile strength.

摘  要：采用正交试验研究了水胶比、硅粉、白水泥和聚合物胶粉掺量等组成参数对复合助剂改性建筑石膏线性膨胀系数的影响，并通过多元回归分析建立了复合助剂改性建筑石膏的线性膨胀系数模型。结果表明，复合助剂改性建筑石膏的线性膨胀系数基本分布在（19.7～22.4）×10-6℃-1之间，小于建筑石膏的线性膨胀系数，温度膨胀性能有一定改善；随着聚合物5010、白水泥、硅粉掺量的增加，石膏的线性膨胀系数逐渐减小；复合助剂改性建筑石膏的线性膨胀系数与组成参数之间存在二次曲线关系，并且游程检验法检验其相关性显著。Abstract:Theinfluenceofwater-binderratio,silicafume,whitecementandpolymerdosageonlinearexpansioncoefficientofcompositeadmixturemodifiedalcinedgypsum(CAMAG)throughorthogonalexperimentisstudied,thecalculationmodeloflinearexpansioncoefficientrelatedtocomponentparametersisestablishbymultipleregressionanalysis.TheresultsshowthatthelinearexpansioncoefficientofCAMAGdistributesbetween（19.7～22.4）×10-6℃-1,whichislessthancalcinedgypsum,temperatureexpansionperformanceofCAMAGhasacertainimprovement.Withincreasingdosageofpolymer5010,whitecementandsilicafume,thelinearexpansioncoefficientofgypsumdecreases.Quadraticcurverelationshipcandescribethecorrelationbetweenlinearexpansioncoefficientandcomponentparameters,and correlationissignificantbyruntest.