第十二期_2018_《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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第十二期

再生水泥稳定碎石基层材料收缩及疲劳性能试验研究[J].混凝土与水泥制品

顾万，肖鹏，杨宇轩，刘安安

２０18年第12期

摘要

引用本文

摘要：以扬州某快速通道改扩建项目为依托，对于原“白加黑”复合式道路铣刨、破碎产生的旧沥青混凝土（RAP）和旧水泥混凝土（RA）进行再生水泥稳定碎石基层材料的适用性研究，将天然骨料（NA）、RA、RAP分别以不同比例掺配设计了9组不同的再生水泥稳定碎石，通过水泥稳定碎石干缩试验、温缩试验和弯拉疲劳试验，分析其收缩机理和抗疲劳性能。研究表明，RA材料的掺入会降低材料的收缩性能，在水泥稳定碎石中混入RAP材料后能够降低材料对水和温度的敏感性，提升材料的收缩性能。RAP材料中沥青的有效成分能够增强水泥稳定碎石材料间的嵌挤作用，提高材料的均匀性和整体性，提高水泥稳定碎石的抗疲劳性能。 Abstract: Based on the reconstruction and expansion project of southern Yangzhou, the applicability of the original "white plus black" compound road milling, broken old asphalt concrete (RAP) and old cement concrete (RA) for recycled cement stabilized macadam base material was studied, and NA, RA and RAP were designed with different proportions of 9, respectively. The shrinkage mechanism and fatigue properties of the cement stabilized macadam were analyzed by the dry shrinkage test of cement stabilized macadam, the temperature shrinkage test and the flexural fatigue test. The study shows that RA can reduce the shrinkage property of the material, and after mixing with RAP in the cement stabilized macadam, the sensitivity of the material to water and temperature can be reduced and the shrinkage performance of the material is improved. The effective composition of asphalt in RAP material can enhance the inlay and extrusion of cement stabilized macadam material, improve the uniformity and integrity of the material, and improve the fatigue resistance of the cement stabilized macadam.

内掺再生砖粉湿拌砂浆制备与力学强度研究[J].混凝土与水泥制品

陶李尧1，罗健林1，2，3，李秋义1，2，3，刘超1

２０18年第12期

摘要

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摘要：结合内掺法，研究了不同胶砂比（B/S）（1∶4、1∶5、1∶6）、不同稠度[（70±10） mm、（90±10） mm、（100~115） mm）情况下，粉煤灰（FA）与再生砖粉（RBP）（掺量20%、30%、40%）对改性再生砂浆（RBFM）28 d抗压强度的影响，探讨了RBP取代水泥的可行性。结果表明，相比FA体系，RBFM的28 d抗压强度均出现不同程度的下降，当B/S为1∶5，RBP掺量为30%，稠度为70 mm时，28 d抗压强度下降幅度最大，达到32.74%，但依然可达M5级砂浆要求，可满足大多数砌筑工程需要。 Abstract: Combined with the mixed method, pre-mixed mortars (RBFM) were studied under the conditions of same Binder-sand ratio (B/S) (1∶4, 1∶5, 1∶6) and consistency [(70±10) mm, (90±10) mm, (100~115) mm], by replacing (20%,30%, 40%) with fly ash (FA) and renewable brick powder influence of 28 d compressive strength , and the feasibility of cement partially replacing with renewable brick powder on pre-mixed mortar was also discussed. Results show that the recycled brick powder compared with FA, the 28 d strength of RBFM has varying degrees of decline, when B/S is 1∶5, the dosage is 30%, and the consistency is 70 mm, its 28 d compressive strength decreases by 32.74%, but still is above M5 mortar level, which can meet the demands for the majority of masonry engineering.

华龙一号”核电站大体积混凝土施工技术

向群

２０18年第12期

摘要

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摘要：“华龙一号”核电站是我国自主研发的具有完全自主知识产权的第三代核电站，采用的是国际上最先进的单堆布置、双层安全壳结构。核电站设计中结构混凝土强度高、体积大，许多重要结构都属于大体积混凝土，因此，大体积混凝土施工质量是核电站土建建造中一个重点。本文介绍了“华龙一号”核电站反应堆厂房筏基大体积混凝土浇筑、振捣的过程控制，以及测温、应力应变检测等监控养护措施，可为类似大体积混凝土施工提供参考。 Abstract: "Hualong No. 1" nuclear power station is the third generation nuclear power station with completely independent intellectual property rights, which adopts the most advanced single reactor arrangement and double containment structure in the world. In the design of nuclear power station, structural concrete has high strength and large volume. Many important structures belong to mass concrete. Therefore, the construction quality of mass concrete is a key point in the civil construction of nuclear power station. The process control of pouring and vibrating of mass concrete on raft foundation of reactor building of Hualong No.1 nuclear power station is introduced, the monitoring and curing measures such as temperature measurement, stress and strain detection are introduced too, which can provide reference for similar mass concrete construction.

叠合梁浇筑方案对梁下支撑安全性的优化研究

彭博1，王东1，徐竟峰2

２０18年第12期

摘要

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摘要：实际工程中大截面梁的混凝土浇筑体积较大，梁下支撑的跨距和步距较小，虽然在使用过程中支撑的安全储备较大，但存在搭设支撑耗时、危险性较大且不经济等缺点。结合工程实例运用有限元软件Ansys中单元生死功能对叠合梁的浇筑进行模拟，对使用叠合梁浇筑方式下梁下支撑进行屈曲分析，并对梁下支撑系统进行了安全性和经济性优化。 Abstract: In actual project, concrete pouring volume of large section beam is large, under beam shoring scaffold span and interval are smaller, while the safety stock to shoring scaffold in use is bigger. When set-up shoring scaffold, there are shortcomings such as time consuming, risky and uneconomical. Combined with practical engineering, th finite element software Ansys is used to simulated with birth and death element in the composite beam casting, the beam buckling analysis is carried out by the use of composite beam under the shoring scaffold of the casting mode, and the safety and economic optimization of beam supporting system is also carried out.

大型预制柱吊装技术研究[J].混凝土与水泥制品

吴焕娟，黄清杰，蒋勤俭，孙源泽

２０18年第12期

摘要

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摘要：大型预制柱的吊装是装配式结构施工的关键工序，各阶段吊装方式的选择，吊点位置的确定对施工安全影响很大，本文系统介绍了大型预制柱从生产制作、运输到安装全过程的吊装技术，以期为大型预制柱构件安全吊装提供技术支撑。 Absrtact: The hoisting of large prefabricated columns is the key process of assembly structure construction. The selection of hoisting modes in each stage and the location of hoisting points have a great impact on construction safety. The hoisting technology of large prefabricated columns from production, transportation to installation are systematically introduced tin order to provide safe hoisting for large prefabricated column components, which can provide technical support.

混凝土不凝结原因分析及检测方法[J].混凝土与水泥制品

张海东，王登科，陈宏哲，宋新乐

２０18年第12期

摘要

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摘要：为快速分析和判断混凝土不凝结原因，研究了缓凝剂（葡萄糖酸钠）的超掺、粉煤灰、矿渣粉完全替代水泥对20 h龄期混凝土溶液pH值的影响以及在缓凝剂超掺情况下采用火焰光度计检测稀释液中Na元素浓度变化。结果表明，缓凝剂超掺对混凝土pH值无显著影响；粉煤灰、矿渣粉完全替代水泥时pH值有显著差异；混凝土溶液中Na元素火焰光度计法的检测浓度与缓凝剂超掺倍数成线性正相关，可以通过混凝土溶液Na检测浓度推测缓凝剂超掺倍数。本论文提出了一种快速判断混凝土不凝结原因的方法，可供工程各相关方参考。 Abstract: The pH of the solution in concrete at the age of 20 h was studied when cement was completely replaced by fly ash, slag powder and the dosage of retarder(sodium gluconate) was mixed excessively for rapid analysis and judgement of the cause of concrete non condensation. The flame photometer was used to measure the concentration of Na element under the condition of overdoge addition of retarder. The results show that the change of pH in concrete with the excessive dosage of retarder is not obvious. When cement is completely replaced by fly ash and slag powder, pH of the concrete has significant difference. The concentrion of Na element measured by flame photometer has a linear positive correlation with the super multiplier of retarder and the super multiplier of retarder can be deduced from the concentration of Na element. A fast method to determine the cause of concrete not condensing is put forward for reference by relevant parties in the project.

B02级砂加气混凝土保温板生产及其应用试验研究[J].混凝土与水泥制品

刘洋，李军奇，薛小雨

２０18年第12期

摘要

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摘要：研发了B02级砂加气混凝土保温板，对产品的原材料、配合比、生产工艺参数、产品性能和耐候性能进行了试验研究。 Abstract: The preparation technology of B02 grade sand aerated concrete insulation board is developed. The raw materials, mix ratio, production process parameters, product properties and weatherability of the insulation board are tested.

轻质混凝土多孔砖自保温墙体热桥传热分析

吴锋，曹帆，俞方英

２０18年第12期

摘要

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摘要：运用计算流体力学（CFD）软件对轻质混凝土多孔砖自保温墙体在框架结构体系中典型的外墙转角热桥传热性能进行了数值模拟计算，通过温度场结果分析，外墙转角热桥内表面在杭州冬季空调室外计算条件下会发生结露现象。为防止热桥内表面结露现象的发生，提出了外墙转角热桥部位的保温处理措施，这些措施值得在自保温墙体体系中借鉴。 Abstract: The heat transfer performance of the external corner thermal bridge about the lightweight concrete porous brick self-insulation wall system in frame structure system is numerically simulated by using computational fluid dynamics (CFD) software. According to the results of temperature, the condensation will occur in the inner surface of the exterior wall corner thermal bridge under the outdoor condition of winter air conditioning in Hangzhou, and some insulation measures are put forward in order to prevent the occurrence of surface condensation. These measures can be used for reference in self-insulation wall system.

HRB500钢筋轻骨料混凝土轴心受压构件试验研究[J].混凝土与水泥制品

张程远1,2，邵永健1,2，朱爱萍3，劳裕华1,2，肖志敏1,2

２０18年第12期

摘要

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摘要：通过8根轻骨料混凝土轴心受压构件试验研究，获得了配置HRB500钢筋轻骨料混凝土轴心受压构件的受力性能与破坏形态，以及荷载-应变关系曲线等试验结果。分析了HRB500钢筋与轻骨料混凝土的协同工作性能，并且提出了轴心受压构件的设计计算方法。研究结果表明，提高轻骨料混凝土强度、配筋率、配箍率能够提高轻骨料混凝土的峰值压应变和构件的极限承载力，HRB500钢筋在轻骨料混凝土轴心受压构件中工作性能良好，强度得到充分发挥。 Abstract: Based on the experiment research about 8 lightweight aggregate concrete(LWAC) columns.The mechanical properties, failure mode and stress-strain curve of HRB500 steel bar LWAC axially compressed column wereobtained. The results show that improve the strength of LWAC, reinforcement ratio, stirrup ratio can improve the peak strain of LWAC and the ultimate bearing capacity of columns, HRB500 steel bar work well in LWAC columns and makes full use of its strength.

.陶粒PF混凝土性能试验研究[J].混凝土与水泥制品

周乾1 ，李宝宝1，吴发红1，荀勇1，嵇蔚冰2，陈云德2，张亚仿3

２０18年第12期

摘要

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摘要：为探索与结构混凝土同寿命的保温模板的主要性能，以陶粒和PF（酚醛树脂）颗粒为骨料，水泥为胶结材料，以水泥用量为变化参数，分别制作了4组用以测定导热系数和吸水率、抗压强度的混凝土试件。试验结果表明，导热系数和吸水率随水泥用量增加而降低，抗压强度随水泥用量增加而增加，当水泥用量达到200 kg/m3时，导热系数及抗压强度均达到JG/T 283—2010《膨胀玻化微珠轻质砂浆》的要求，当水泥用量达到250 kg/m3时，吸水率仅为5.2%，导热系数亦符合JG/T 283—2010的规定，但其抗压强度远高于其要求。该成果可为保温模板设计提供依据，也可为外墙保温层材料选用提供新途径。 Abstract: The same life performance as the main structural concrete exploration and incubated template to ceramic and PF (phenol resin) particles aggregate, cement cementing material in an amount of variation parameter, the 4 groups were prepared for the determination of concrete specimens with thermal conductivity, water absorption and compressive strength. The results show that the thermal conductivity and water absorption decrease with the increase of cement dosage, but the compressive strength increases with the increase of cement dosage. When the cement dosage is 200 kg/m3, the thermal conductivity and compressive strength reach the requirements of JG/T 283—2010 Expanded Vitrified Microbeads Lightweight Mortar, when the cement dosage is 250 kg/m3, the water absorption rate is only 5.2%, the thermal conductivity is also in line with JG/T 283—2010, but its compressive strength is far higher than its requirements. The result can provide a basis for the design of the thermal insulation template, and can also provide a new way for the selection of the outer wall insulation material.

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