苏州混凝土水泥制品研究院有限公司

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第二期

钢纤维再生混凝土弯曲疲劳性能研究
钢纤维再生混凝土弯曲疲劳性能研究
  • 秦道天
2016年第2期
摘要
引用本文
摘 要:对普通混凝土(NC)、再生混凝土(RAC)、钢纤维混凝土(SFRC)和钢纤维再生混凝土(SFRRAC)的弯曲疲劳性能进行了试验研究。分析了应力水平、再生骨料和钢纤维对混凝土弯曲疲劳寿命和离散性的影响规律。在试验研究的基础上,应用疲劳寿命统计学理论拟合了各组混凝土材料弯曲疲劳寿命的两参数威布尔分布,并建立了相应的单对数和双对数弯曲疲劳方程。结果表明,再生混凝土的疲劳寿命明显低于天然骨料混凝土,离散性也更大;钢纤维可以显著提高混凝土的疲劳寿命,并降低离散性。各组混凝土材料的弯曲疲劳寿命很好地服从两参数的威布尔分布;建立的单对数和双对数弯曲疲劳方程与试验实测数据吻合良好。 Abstract: The experimental research on the flexural fatigue properties of normal concrete (NC), recycled aggregate concrete (RAC), steel fiber reinforced concrete (SFRC) and steel fiber reinforced recycled aggregate concrete (SFRRAC) is carried out. The influence rules of stress level, recycled aggregate and steel fiber on fatigue life and discreteness are analyzed. Based on the experimental studies, two-parameter Weibull distribution of flexural fatigue life of concrete is derived by using statistics theory, and the corresponding single logarithmic and double logarithmic equations are gained. The experiment results show that flexural fatigue life of recycled aggregate concrete is obviously lower than that of natural aggregate concrete, and the discreteness is greater; steel fiber can significantly improve the flexural fatigue life of concrete and decrease the discreteness. The flexural fatigue life of concrete materials follows two-parameter Weibull distribution; experimental single logarithmic and double logarithmic equations can describe the experimental test data well.
磷渣-粉煤灰复合辅助性胶凝材料性能研究
磷渣-粉煤灰复合辅助性胶凝材料性能研究
  • 廖建勋,李 军,卢忠远
2016年第2期
摘要
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摘  要:以磷渣-粉煤灰复合辅助性胶凝材料为对象,研究了不同磷渣掺量对低等级粉煤灰的需水量比、活性指数以及与减水剂适应性的影响,并利用XRD,SEM,TG等测试手段探究磷渣-粉煤灰-水泥体系的相互作用机理。结果表明,磷渣的掺入有助于降低粉煤灰需水量比、提高粉煤灰的活性指数,改善与外加剂的适应性,磷渣-粉煤灰-水泥体系的水化产物主要包含Ca(OH)2、AFt、CaCO3、C-S-H凝胶。Abstract:Takingthephosphorusslag-flyashcompositeauxiliarycementitiousmaterialsasanobject,theinfluencesofdifferentphosphorusslagcontentonwaterdemandratio,activityindexoflowgrandflyashandthecompatibilityofsuperplasticizerarestudied,besides,theinteractionmechanismofphosphorusslag-flyash-cementcompositebindingmaterialsisdiscussedbyusingXRD,SEM,TG.Theresultsshowthat,addingphosphorusslagcandecreasethewaterdemandratioofflyashwhichcanincreaseactivityindexofflyash,andimprovethecompatibilityofsuperplasticizer.Hydrationproductsofphosphorusslag-flyash-cementcompositebindingmaterialsmainlyincludeCa(OH)2、AFt、CaCO3andC-S-Hgel.
白浪河大桥异型斜腿混凝土施工技术分析与研究
白浪河大桥异型斜腿混凝土施工技术分析与研究
  • 余 沛1,李 多2,孙旭平3,王安辉1
2016年第2期
摘要
引用本文
摘 要:结合白浪河大桥及摩天轮工程的斜腿施工工程实例,从施工工艺及BIM软件模拟方面,运用理论与实践相结合的施工方法及项目管理理念,对白浪河大桥及摩天轮工程的斜腿施工工艺进行了论述,并总结了桥轮合一的情况下大型异形混凝土分层浇筑的施工方法。 Abstract: Combination with legs construction engineering project for Bailang river bridge and Ferris wheel project, from construction technology to BIM software simulation, construction method and project management concepts are used with theory and practice, legs construction technology for Bailang river bridge and Ferris wheel project is discussed, construction method of large special-shape layered pouring is summarized under the situation of bridge-round.
PVA-ECC材料在桥梁伸缩缝工程中的应用
PVA-ECC材料在桥梁伸缩缝工程中的应用
  • 刘曙光1,2,常智慧1, 张栋翔1, 张国才3, 柴寅博3
2016年第2期
摘要
引用本文
摘 要:为提高桥梁伸缩缝的使用寿命,解决伸缩缝破损快速修复的问题,提出了一种高延性纤维增强水泥基复合材料(PVA-ECC)。室内试验结果表明,PVA-ECC具有良好的抗弯性能、抗拉性能、抗渗性能、抗冻性能,对伸缩缝常见病害有良好的预防及修复效果且施工简便,养护时间短。 Abstract: In order to improve the service life of bridge expansion joints and solve the problem of rapid repairing for damage of expansion joints, a high ductility fiber reinforced cementitious composites (PVA-ECC) is proposed. Laboratory test results show that, PVA-ECC has good flexural performance, tensile properties, permeability resistance, frost resistance performance, which has good prevention and repairing effect for common disease of expansion joints, PVA-ECC is easy to construct and maintenance time is short.
泡沫混凝土抗压强度和导热系数的实验研究
泡沫混凝土抗压强度和导热系数的实验研究
  • 习会峰1,刘逸平2,马宏伟1,罗绍鸿3,王志刚3,黄 芹3
2016年第2期
摘要
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摘 要:研究了轻质泡沫混凝土在不同密度下的抗压强度和导热性能。结果表明,抗压强度和导热系数均随着干密度的增大而增大;建立了抗压强度和导热系数与干密度的非线性本构关系,可为泡沫混凝土用于建筑保温系统提供理论参考。 Abstract: The compressive strength and thermal conductivity of lightweight foam concrete under different density is studied. The results show that, compressive strength and thermal conductivity are increased with the increasing of dry density; nonlinear constitutive relation for dry density with compressive strength and thermal conductivity are established, which can provide a theoretical reference to foamed concrete for building insulation system.
预制构件用钢铁渣粉混凝土配合比试验研究
预制构件用钢铁渣粉混凝土配合比试验研究
  • 林茂松1,潘 平2,余晓红2,朱永明3
2016年第2期
摘要
引用本文
摘  要:通过正交试验,研究了胶凝材料用量、钢铁渣粉掺量、外加剂掺量和砂率对混凝土性能的影响。结果表明,钢铁渣粉的掺入会延长混凝土凝结时间和降低早期强度,但对后期强度影响不大,可通过适当提高胶凝材料用量、外加剂掺量和砂率进行优化,当胶凝材料用量为340kg/m3、370kg/m3,钢铁渣粉掺量为20%,外加剂掺量为0.6%,砂率为40%时,混凝土工作性能和力学性能均满足PC构件生产要求,可为预制构件中钢铁渣粉的大规模推广应用提供技术支撑。Abstract:Throughorthogonalexperiments,theinfluenceofcementitiouscontent,steelslagpowderdosage,admixturecontentandsandratioonpropertiesofconcreteisstudied.Theresultsshowthat,addingsteelslagpowdercanextendthesettingtimeofconcreteanddecreaseearlystrengthofconcrete,whichhaslittleinfluenceonlatestrengthofconcrete,theoptimizationiscarriedoutbyincreasingamountofcementitiousmaterials,admixturedosageandsandrate,whenamountofthecementitiousmaterialsis340kg/m3and370kg/m3,thedosageofsteelslagpowderis20%,thedosageofadmixtureis0.6%,andsandratiois40%,theworkabilityandmechanical performanceofconcretecanmeettheproductionrequirementofprefabricateconcrete,whichcanprovidetechnicalsupportforlarge-scaleapplicationofsteelslagpowderinprefabricatedcomponents.
蒸压加气混凝土砌块自保温墙体专用砌筑砂浆中钢筋埋置长度的试验研究
蒸压加气混凝土砌块自保温墙体专用砌筑砂浆中钢筋埋置长度的试验研究
  • 陈 萌,赵湘育,马婷婷,张豪剑,刘乐庆
2016年第2期
摘要
引用本文
摘 要:通过九组试件36根钢筋在蒸压加气混凝土砌块自保温墙体专用砌筑砂浆中的拉拔试验,分析了竖向正应力、砂浆强度等级和钢筋锚固长度等因素对拉结钢筋黏结锚固性能的影响;通过三组试件6根钢筋的拉拔试验,得出钢筋内力和黏结应力沿锚固长度的分布曲线;计算锚固破坏时沿锚固长度变化的平均黏结应力,分别给出钢筋在自保温墙体砌块专用砂浆强度等级Mb5和Mb10中的临界锚固长度;为便于工程应用,提出了满足可靠度要求的钢筋建议埋置长度。 Abstract: Through the pullout tests of nine group specimens for 36 steel reinforced in autoclaved aerated concrete blocks self-thermal insulation wall, the influence of vertical normal stress, mortar strength grade and steel bar anchorage length on bond-anchorage property of binding steel bar is analyzed; through the pullout tests of three group specimens for 6 steel reinforced, the distribution curves of steel forces and bond stresses along anchorage length are obtained; the average bond stresses along anchorage length are calculated at bond-anchorage failure, and the critical anchorage lengths of steel bar embedded in Mb5 and Mb10 are given. For engineering application, the design anchorage lengths to satisfy reliability requirement are proposed.
预制混凝土叠合板钢筋黏结性能的研究
预制混凝土叠合板钢筋黏结性能的研究
  • 侯和涛,陈 磊,程佑东,朱文灿
2016年第2期
摘要
引用本文
摘 要:通过钢筋的拉拔试验研究了预制混凝土叠合板内钢筋的黏结性能。设计30个预制板与后浇混凝土的叠合板试件,主要研究混凝土强度、钢筋锚固长度、钢筋位置、钢筋直径四个因素对黏结性能的影响。并设计12个混凝土现浇试件作为对比,以研究两种试件钢筋与混凝土黏结强度的差异。试验结果表明:叠合试件发生剥离破坏和劈裂-剥离破坏,现浇试件均发生劈裂破坏;叠合试件内钢筋的黏结强度随钢筋直径和锚固长度的减小、混凝土强度和钢筋至预制板距离的增大而增大,并且明显小于现浇试件中钢筋的黏结强度。根据试验结果,统计回归出预制混凝土叠合板钢筋的极限黏结强度计算公式,并由此推出钢筋锚固长度的计算公式以指导工程应用。 Abstract: This paper investigates the bond behavior of steel bars in precast concrete composite slabs through pull-out tests. A total of 30 specimens representing steel rebars embedded in precast concrete composite slabs were prepared for evaluating the influences of concrete strength, anchorage length, embedded location and rebar diameter on bonding strength of the rebars. For comparison purpose, another 12 specimens of the steel rebars embedded in cast-in-place concrete were also tested. Test results show that the rebars embedded in precast concrete composite slabs either exhibit debonding failures or cause splitting failures in the surrounding concrete while the rebars embedded in cast-in-place concrete consistently failed due to splitting failures of the concrete. Additionally, it is found that bonding strength of the rebars embedded in precast concrete composite slabs increases when the rebar diameter and anchorage length reduce. Moreover, bonding strength of the rebars embedded in precast concrete composite slabs tends to be higher when concrete strength is higher and the distance between steel rebars and precast panels becomes larger. Further, test results reveal that bonding strength of the rebars embedded in precast concrete composite slabs is remarkably lower than that of the rebars embedded in cast-in-place concrete. Based upon regression analysis of the test data, an analytical model was proposed for calculating bonding strength of the rebars embedded in precast concrete composite slabs. The model can be used to determine the required anchorage length of the rebars embedded in cast-in-place concrete in design.
国产PVA纤维用于高韧性纤维增强水泥基复合材料的试验研究
国产PVA纤维用于高韧性纤维增强水泥基复合材料的试验研究
  • 彭明强1,李国友2,范 磊 1,李 锐1,王明铭1
2016年第2期
摘要
引用本文
摘 要:采用正交试验设计方法,以国产聚乙烯醇(PVA)纤维作为增强纤维,研究了水胶比、粉煤灰掺量和胶砂比对高韧性纤维增强水泥基复合材料单轴拉伸性能的影响。研究结果表明:在较大水灰比和粉煤灰掺量达到70%的情况下,选用国产PVA纤维,仍然可以配制出成本低/单轴拉伸应力应变达到1%,且具有多微裂缝开裂特征的高韧性纤维增强水泥基复合材料。 Abstract: Through design method of orthogonal experiment, domestic polyvinyl alcohol(PVA) fiber as reinforce fiber, the influence of water-binder ratio, content of fly ash and cement aggregate ratio on uniaxial tension of high toughness fiber cementitious composites is studied.The results show that, under the situation of high water-binder ratio and 70% dosage of fly ash, low cost and 1% uniaxial tension stress can be prepared by domestic PVA fiber, and high toughness fiber cementitious composites have characteristic of more micro-cracks.
磁化水钢纤维混凝土抗折性能试验与分析
磁化水钢纤维混凝土抗折性能试验与分析
  • 费厚乾,马芹永
2016年第2期
摘要
引用本文
摘 要:为改善混凝土脆性、易开裂缺点,提高纤维与混凝土的黏结强度,同时提高混凝土强度,综合考虑三者的基础上,采取在混凝土中掺入钢纤维,并使用磁化水代替普通水,制备磁化水钢纤维混凝土,进行三种水流速度和四种钢纤维体积率条件下的抗折强度试验。试验结果表明,对于普通水和磁化水钢纤维混凝土,抗折强度均随钢纤维掺量的增加而增大;磁化水能有效提高钢纤维混凝土的抗折强度;当钢纤维体积率为1.8%,水流速度为2.1m/s时抗折强度提高幅度较大,增长率为27.38%。 Abstract: In order to improve the shortage for brittleness of concrete and easy to crack, the bonding strength of the fiber and concrete is enhance, at the same time, strength of concrete is improved, considering these three factors, magnetized water steel fiber reinforced concrete is prepared by adding steel fiber in concrete, using magnetized water instead of ordinary water. Flexural strength experiments for three kinds of flow velocities and four kinds of steel fiber volume rate are carried out. The results show that, as ordinary water and magnetized water steel fiber reinforced concrete, flexural strength is increased with the increasing steel fiber content; magnetized water can effectively enhance flexural strength of steel fiber reinforced concrete; when the steel fiber volume is 1.8%, the flow velocity is 2.1m/s, flexural strength increased by a big margin, growth rate is 27.38%.
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