第十期_2015_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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第十期

基于工业废渣再生微粉新型无熟料胶凝材料的试验研究

李东1，李鹏鹏1，田万溪1，孙家瑛1,2

２０15年第10期

摘要

引用本文

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.

Ⅰ类品质再生粗骨料混凝土抗碳化性能试验研究

孔哲，李秋义，郭远新，谢汝朋，曹瑜斌

２０15年第10期

摘要

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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%.

钢渣用于煤渣砖中的氡污染研究

武林1，邓跃全1，孙婷1，崔宏星2，尚兵2

２０15年第10期

摘要

引用本文

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.

薄壁混凝土渡槽结构施工过程中的温度应力分析

张永存1，李青宁2

２０15年第10期

摘要

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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.

纤维石膏基复合材料力学性能研究

张维渤，熊峰，余明玖，陈江

２０15年第10期

摘要

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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.

复合助剂改性建筑石膏的线性膨胀系数

杨建森，刘源，马瑞洁，赵冰，王文丽

２０15年第10期

摘要

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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.

水灰比和外加剂对泡沫混凝土性能的影响

何立粮，杨立荣，张宝强

２０15年第10期

摘要

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摘要：研究了水灰比、激发剂高锰酸钾掺量、早强剂三乙醇胺掺量对化学发泡泡沫混凝土干密度和抗压强度的影响。结果表明，适宜的水灰比为0.46，高锰酸钾适宜掺量为5%，三乙醇胺能减少泡沫混凝土密度，但其强度也随之降低，适宜掺量为0.04%。 Abstract: The influence of W/C, activator for potassium permanganate dosage and early strength agent for triethanolmine on dry density and compressive strength of chemical foamed foam concrete is studied. The results show that, the suitable dosage of W/C is 0.46, the content of potassium permanganate is 5%, the triethanolamine can decrease density of foamed concrete, and compressive strength is reduced. The suitable content of triethanolamine is 0.04%.

聚苯板保温复合剪力墙板的抗弯性能与热工性能分析

戎贤1,2，许丹丹1,2，王海涛1,2，刘平1,2

２０15年第10期

摘要

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摘要：研究了三种插筋形式下的聚苯板保温复合墙板的抗弯性能及热工性能；分析得出了三种插筋形式的试件在受弯承载力和刚度方面均能满足正常使用的要求，垂直插筋形式的试件受力性能更好，承载力和刚度更高，结构形式更稳定，能够有效地约束混凝土的变形。通过热工性能分析，垂直插筋形式的试件节能效果好，穿孔率比其他两种形式要小，可进一步通过减少插筋量来提高热工性能。 Abstract: The bending property and thermal performance of polystyrene insulation composite wall board is studied through three steel inserting forms, the requirements for bending capacity and stiffness of specimens with three kinds of inserting form can be satisfied. Mechanical properties of specimen with vertical inserting form is better, which have higher capacity and stiffness and more stable structure form, deformation of concrete can be effectively restrained. Through the analysis of thermal performance, the specimen with vertical inserting form has good energy saving effect, perforation rate is smaller than the other two forms, which can improve thermal performance by reducing the number of inserted bars.

PVA 纤维水泥基复合材料桥面连接板试验研究

王浩宇1，田稳苓1，周铁华2，崔磊涛3

２０15年第10期

摘要

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摘要：通过静力加载试验，以两跨简支桥梁为原型，对比分析了普通钢筋混凝土连接板和PVA-ECC纤维混凝土连接板在正常使用过程中的抗裂和抗渗性能。结果表明，PVA-ECC纤维混凝土连接板开裂荷载是普通钢筋混凝土连接板的2.5倍；普通钢筋混凝土连接板的裂缝数量较少，平均间距76.8mm，最大裂缝宽度0.21mm；PVA-ECC纤维混凝土连接板的裂缝数量较多，平均间距22.6mm，最大裂缝宽度小于0.1mm。相同荷载作用下，普通钢筋混凝土连接板的混凝土应变比PVA-ECC纤维混凝土连接板大，但钢筋应变较小。 Abstract: Through the static loading test with two span simply supported bridges, the analysis on performance of crack resistance and impermeability of ordinary reinforced concrete connecting plate and PVA-ECC fiber reinforced concrete connecting plate during normal use is compared. The results show that the cracking load of PVA-ECC fiber connection reinforced concrete slab is 2.5 times as large as ordinary reinforced concrete. Ordinary reinforced concrete connecting plate has smaller cracks and the average distance is 76.8mm and the maximum crack width is 0.21mm. In contrast, PVA-ECC fiber reinforced concrete slab has bigger cracks and the average distance is 22.6mm and maximum crack width is less than 0.1mm. With the same load, the concrete strain of the ordinary reinforced concrete slab is bigger than the PVA-ECC fiber reinforced concrete slab, but the steel strain of the ordinary reinforced concrete slab is smaller.

基于正交试验的SFRC动态抗压性能研究

杨明宇，谢卫红，周楠

２０15年第10期

摘要

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摘要：在三种气压下，采用SHPB装置对四因素四水平正交试验的SFRC试件进行冲击试验。给出了不同因素对SFRC动态抗压强度影响的主次关系、显著程度和最优组合，分析了SFRC试件的破坏形态，用含损伤因子的ZWT本构模型对SFRC力学行为进行了拟合。试验结果表明，砂率在低应变率下对强度影响最大，水胶比在中高应变率下对强度影响最大。受冲击时高钢纤维掺量能强化钢纤维增韧效果，弓形钢纤维更易保持SFRC试件形状。 Abstract：At three different pressures, the impact tests of SFRC specimens with orthogonal tests of four factors and four levels are carried out by using 74mm SHPB test device. The primary and secondary relationships, significant degree and optimal combination of different factors on dynamic compressive strength of SFRC are given, the damage form of SFRC is analyzed, and the mechanical behavior of SFRC is fitted by using ZWT constitutive model with damage factor. The results show that the sand rate is the biggest impact on strength in the low stain rate, the water cement ratio is the biggest impact on strength in the high stain rate, high steel fiber content can strengthen toughening effect of steel fiber by impact, bow steel fiber is more easily to maintain shape of SFRC.

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