第十期_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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第十期

再生微粉性能对比试验研究

兰聪，罗杰，卢佳林，陈景，杨仕海

２０18年第10期

摘要

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摘要：研究了Ⅱ级粉煤灰、再生砖粉和再生混凝土微粉的基本性能，对比了再生砖粉和再生混凝土微粉替代Ⅱ级粉煤灰对混凝土工作性和力学性能的影响；并通过改性剂改善混凝土坍损过大的问题，分析了改性剂影响混凝土力学性能的机理。研究结果表明，再生砖粉和再生混凝土微粉在一定细度条件下，其性能与Ⅱ级粉煤灰相当；缓凝剂、激发剂以及部分表面活性剂组成的改性剂对工作性和力学性能具有明显的改善作用；而水化铝硅酸钙对混凝土力学性能有较大的提高作用。 Abstract: The basic properties of the fly ash, recycled brick powder and recycled concrete powder are studied. The recycled brick powder and recycled concrete powder instead of fly ash in concrete preparation are compared. The influence on the working performance and mechanical properties are investigated. And by adding the modifier to improve the large concrete slump loss. The mechanism of change influence of modifiers on mechanical properties of concrete are analyzed. The results show that the performance of recycled brick powder and recycled concrete powder in certain fineness conditions is similar to fly ash. The retarder, activator and some surfactant composition modifier have obvious effect on the working performance and mechanical properties, the hydration calcium silicate aluminum can improve the mechanical properties of concrete obviously.

再生骨料在透水混凝土中的试验研究

陈海，蒋元海，凌宏杰，熊小虎，何俊皓，应玲巧，吴淑伟

２０18年第10期

摘要

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摘要：采取正交试验法研究了再生骨料掺量、水胶比、骨料颗粒级配三个因素对透水混凝土的强度和透水性的影响。结果表明，最佳配比为：再生骨料掺量40%、水胶比0.25，再生骨料由50%粒径为4.75～9.5 mm的再生骨料和50%粒径为9.5～16 mm的再生骨料混合组成，在该配比下制得的透水混凝土透水系数为6.3 mm/s，抗压强度为23.1 MPa。 Abstract: Orthogonal text were adopted to study the effects of recycled aggregate content, W/B, aggregate particle size distribution on the strength and permeability of permeable concrete. The results show that the performance of permeable concrete is the best when the recycled aggregate content is 40%, the W/B is 0.25, and the amount of recycled aggregates of 4.75～9.5 mm and 9.5～16 mm is taking 50% part, respectively. The compressive strength and permcability coefficicnt of pervious concrete obtaied by the mix proportion is 23.1 MPa and 6.3 mm/s

改性高岭土尾矿复合水晶废渣在水泥基材料中的应用研究

孔贇，田焜，王月兰，陶瑞鹏，向亚玲

２０18年第10期

摘要

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摘要：将经改性的高岭土尾矿与水晶废渣复合，等量取代水泥内掺到水泥基材料中，研究了掺入前后和不同掺量对水泥基材料的工作性、力学性能和体积稳定性的影响。并运用SEM等微观测试手段，探讨了其影响机理。结果表明，当改性高岭土尾矿和水晶废渣掺量为10%时，对水泥基材料的工作性影响不大，同时能够提高砂浆的强度和体积稳定性，优化水化产物和水泥基材料的孔结构。 Abstract: The effect of modified kaolin tailings blended with crystal residues on performance on cement-based material, where the content of kaolin tailings and crystal residues mixture are varied by weight, is investigated. SEM is used to study the mechanism. The slump, strength and shrinkage of mortar mixes containing six different mixtures are tested. The results show that the strength and shrinkage performance significantly increases with the incorporation of 10% kaolin tailings and 10% crystal residues, meanwhile, the mixtures have little effect on the slump of mortar. On the other hand, kaolin tailings and crystal residues mixtures improve the hydration products and the pore structure of cement-based materials.

C50泵送顶升钢管混凝土在市政桥梁中的应用

刘登贤，关素敏，吴鑫

２０18年第10期

摘要

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摘要：顶升自密实微膨胀钢管混凝土可有效结合钢管和混凝土的优势且施工速度快、简单方便，浇筑质量良好，因此，在高层建筑和桥梁工程中得到了广泛应用。本文以市政桥梁泵送顶升项目为背景，分析了顶升自密实微膨胀钢管混凝土的原材料选择、配合比设计以及施工控制要点。 Abstract: The self-compacting micro-expansion pumping concrete filled steel tube can effectively combine the advantages of steel tube and concrete, and the construction speed is fast, simple and convenient, and the pouring quality is good. Therefore, it has been widely used in high-rise buildings and bridge engineerings. Based on the municipal bridge of pumping lift-up project, the raw material selection, mix proportion design and construction control key points of self-compacting micro-expansion concrete filed steel tube are analyzed .

超高工作性钢管拱机制砂自密实混凝土的制备与工程应用

张弢1，袁政成2，蒋正武2，刘彬3

２０18年第10期

摘要

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摘要：为实现机制砂自密实混凝土在钢管拱中获得良好的应用，研究了机制砂自密实混凝土的最佳配合比，进行了现场模拟试验，并提出了施工技术要点。试验制备出初始坍落度大于270 mm、坍落扩展度大于700 mm、倒坍落度筒流出时间小于5 s、6 h内工作性基本无损失、具有一定补偿收缩性能的钢管拱机制砂自密实混凝土。现场模拟试验验证了机制砂自密实混凝土可以无死角填充有机玻璃管。此外，经良好的现场施工组织与控制、浇筑过程监控，使得钢管拱机制砂自密实混凝土在工程中成功应用。 Abstract: In order to achieve the better application of manufactured sand self-compacting concrete (MS-SCC) in steel pipe arch. The optimum mix ratio of MS-SCC was studied, field simulation tests were carried out and the key construction technologies were put forward. MS-SCC filled steel pipe arch was prepared with the properties such as initial slump more than 270 mm, slump flow above 700 mm, dropping time of concrete from inverted slump cone less than 5 s, 6 h slump zero-loss and shrinkage-compensating. Field simulation tests show that the MS-SCC can be completely filled with plexiglass pipes. By the good construction organization, control and perfusion process monitoring on-sit. MS-SCC can be applied in the steel pipe arch project successfully.

普通混凝土用石子压碎指标测定试样制备装置设计

付希尧

２０18年第10期

摘要

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摘要：压碎指标用于衡量石子在逐渐增加的荷载下抵抗压碎的能力，是评定石子在建筑工程中适用性的重要力学性能指标。针对石子压碎指标值测定试样制备过程存在的不足，设计并研制了一种普通混凝土用石子压碎指标值测定试样制备装置。通过自动化机电控制方式，利用PLC控制器来控制和驱动电机来完成整个试验样品制备过程，一定程度上可减少试验人员的体力劳动的工作量，也可减小因经验不足或操作水平低而产生试验数据误差概率 Abstract: The crushing index is used to measure the ability of gravel to resist crushing under increasing load, which is an important mechanical performance index for assessing the applicability of gravel in construction engineering. Aiming at the deficiency in the preparation process of the gravel crushing index values, a kind of specimen preparation device for the measuring of the crushed index values of regular concrete was designed and developed. By means of automatic electromechanical controlling, utilized PLC controller to control and drive the motors to complete the whole process of sample preparation, the workload of manual labor of the tester can be reduced to a certain extent. It can also reduce the error probability of experimental data due to lack of experience or low level of operation.

预制混凝土衬砌管片模具的改进研究

张金镌，刘增喜，逄晨

２０18年第10期

摘要

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摘要：预制混凝土衬砌管片模具的设计过程较复杂，为了得到好的振捣效果，同时保证模具不因振动而开裂，使用有限元软件ANSYS对模具进行了模拟分析，以此来辅助模具底板振捣梁的设计、振动器数量与位置的确定，从而使模具振捣设计达到更好的效果 Abstract：The design process of precast concrete lining segment die is rather complicated. In order to obtain good vibration effect, and ensure that the mould does not crack due to vibration, the design of vibration beam of mould bottom plate, and the number and position of vibrators, the finite element software ANSYS is used to analyze and simulate the mold, which can provide the better result of vibration design.

JC/T 2456—2018《预制混凝土箱涵》标准解读

王春蓉1，高颖1，沈丽华1，褚建中2

２０18年第10期

摘要

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摘要：行业标准JC/T 2456—2018《预制混凝土箱涵》已于2018年9月1日开始实施。为了便于标准使用各方准确贯彻实施标准的具体要求和规定,本文介绍了JC/T 2456—2018标准的编制背景、编制目的和意义,并对标准的主要条款作了解释和说明。 Abstract: The construction industry products industry standard JC/T 2456-2018 Precast concrete box culvert was officially issued,which was implement on September 1st,2018. In order to carry out and implement the specifications of the standard, the compilation background, compilation purpose and meanings of the standard are introduced.

玻化微珠抹面砂浆防结露试验研究

涂沛1，程忠庆2，马明丹3

２０18年第10期

摘要

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摘要：为研究玻化微珠抹面砂浆这种保温材料的防结露效果，分别以普通砂和玻化微珠为骨料，制作普通水泥抹面砂浆和不同厚度的玻化微珠抹面砂浆与混凝土底板复合试件，放置于具有恒定温湿度差的结露环境中，观察发生结露的时间。试验结果表明，玻化微珠砂浆的隔热性与其表面的毛细吸水作用有益于延长其表面发生结露的时间，且结露时间随砂浆厚度增加而延长。在给定试验环境下，10 mm厚玻化微珠砂浆发生结露时间约为同等厚度普通水泥砂浆的10倍；15 mm厚的玻化微珠砂浆在试验周期内表面未发生结露。. Abstract: In order to research the anti-condensation properties of the insulating material of glazed hollow beads surface mortar, ordinary sand and glazed hollow beads were used as aggregates to make composite specimens of ordinary cement surface mortar and glazed hollow beads surface mortar with different thickness, which were placed in the condensation environment with constant difference of temperature and humidity, the time of condensation was observed. The results show that heat insulation and capillary water absorption of the glazed hollow beads mortar are beneficial to prolong the dew condensation time on the surface, and which prolongs with incresing of mortar thickness. Under a given experimental environment, the dew condensation time of the 10 mm thick glazed hollow beads mortar is 10 times that of the ordinary cement mortars, the dew consendation does not occur on the surface of the 15 mm glazed hollow beads mortar during the experimental cycle.

全固废泡沫混凝土性能研究

刘晓圣1，王美娜2，王振方3，聂京凯1，姬军2，倪文2，陈新1，韩钰1

２０18年第10期

摘要

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摘要：以钢渣、矿渣、脱硫石膏为原料采用物理发泡的方法制备全固废泡沫混凝土，研究了发泡剂稀释比例和养护温度对其抗压强度影响。试验表明，当发泡剂稀释比例为1∶40，养护温度为70 ℃时，体积密度为600 kg/m3的泡沫混凝土块28 d抗压强度可达到6.29 MPa。经扫描电镜观察水化产物发现有大量的钙矾石生成。 Abstract: The solid foam concrete is prepared by physical foaming method with steel slag,powdered slag and desulphurization gypsum as raw materials. The influence of the dilution ratio and curing temperature of the foaming agent on the compressive strength of the concrete is studied. The experimental results show that when the dilution ratio of the foaming agent is 1∶40 and the curing temperature is 70 ℃, the 28 d compression strength of the foam concrete block with volume density of 600 kg/m3 can reach 6.29 MPa. A large number of ettringites is found by scanning electron microscopy.

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