第三期_2014_《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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第三期

工业废石膏煤矸石复合制备绿色胶凝材料试验研究

白梅力1，张凯峰2，赵建敏2，高魁3

２０14年第3期

摘要

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摘要：利用工业副产品石膏与煤矸石复合制备石膏基绿色胶凝材料，检测了复合胶凝材料的物理力学性能，并借助XRD、SEM等测试手段分析了试件微观性能。结果表明，煤矸石的掺加对复合胶凝材料具有重要影响，综合考虑各项因素，认为掺加10%煤矸石粉能够制备出性能优良的复合胶凝材料。 Abstract: The gypsum based green cementing materials are prepared by using the industrial by-product gypsum and coal gangue. And the physical and mechanical properties of composite gelled material are tested, meanwhile, the microscopic properties of specimens are characterized using XRD and SEM. The results show that coal gangue has an important effect on the properties of composite gelled material. Comprehensively considering of various factors, it’s found that high performance composite gelled material can be prepared by adding 10% gangue powder.

石膏基膨胀珍珠岩保温板的制备及影响因素研究

王宇卫，伍勇华，姚源，南峰

２０14年第3期

摘要

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摘要：研究了石膏、引气剂、发泡剂与聚丙烯纤维对石膏基膨胀珍珠岩制品强度及干表观密度的影响。结果表明，随石膏用量减少，制品的干表观密度减小，抗压与抗折强度略减小；在相同石膏用量下，掺入引气剂能显著降低制品的干表观密度，但会对制品的抗折与抗压强度产生不利的影响；随着发泡剂掺量的增加，制品的抗压与抗折强度降低，而制品的干表观密度也减小；随聚丙烯纤维含量的提高，制品干表观密度降低。 Abstract: The effects of gypsum, foaming agent, retarder and polypropylene fiber on compressive strength and dry bulk density of gypsum-based expanded perlite products are studied. The results show that with the decreasing of gypsum content, dry bulk density, compressive and flexural strength of products decrease. Under the same content of gypsum, adding the foaming agent can significantly reduce the dry bulk density of products, but may have an adverse effect to the flexural and compressive strength of the products. With the increasing of hydrogen peroxide content, the compressive, flexural strength and dry bulk density of products all decrease. In addition, with the increasing of polypropylene fiber content, dry bulk density of products decreases.

碱性环境中铁尾矿的化学稳定性研究

李晓光，景帅帅，马昕

２０14年第3期

摘要

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摘要：将铁尾矿和河砂分别浸泡于三种碱性溶液中，分别测定了不同浸泡时间的质量损失率、浸泡溶液的pH值和电导率值变化。结果表明：铁尾矿不会发生碱-集料反应；碱性环境中，河砂的质量损失率总体高于铁尾矿。河砂浸泡液的pH值降幅高于铁尾矿；河砂浸泡液的电导率值高于铁尾矿。在碱性环境中，铁尾矿比河砂具有更好的化学稳定性，具有代替河砂配制水泥基胶凝材料的可行性。 Abstract: The iron ore tailing (IOT) and river sand are respectively soaked into three kinds of alkaline solution with different pH to test the mass loss of granules, pH and electricity conductivity of soaking solution in different periods. The results show that IOT is not susceptible to alkali-silica reaction. Mass loss of river sand is higher than that of IOT under the alkaline solution. The pH of soaking solution with river sand has more significant decrease compared with that of IOT, whereas inversely variation for electricity conductivity occur following prolongation of time. Better chemical stability of IOT is proven than that of river sand, which provides a reliable guarantee for application of IOT in Portland cement materials substituting river sand as fine aggregate.

废旧聚苯颗粒改性水泥砂浆力学性能研究

李启强，张海波，李明远，芦昊

２０14年第3期

摘要

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摘要：以废旧聚苯颗粒等体积取代水泥砂浆中的砂子，研究了废旧聚苯颗粒掺量对水泥砂浆静力学性能的影响。结果表明,随聚苯颗粒掺量增加，砂浆流动度先增加后下降，砂浆试样7d、28d抗折抗压强度均呈下降趋势，3d抗折强度先增加后下降，抗压强度下降缓慢；砂浆试样3d、7d、28d抗压强度与密度存在线性关系，且线性关系都比较显著。 Abstract: The influence of the content of waste polystyrene granule which substitutes the equivalent content for sand in mortar on physical properties of cement mortar is studied. It shows that with the increasing of polystyrene granule aggregate content, the fluidity of cement mortar firstly increases and then decreases; The 7d, 28d of flexural and compressive strength of samples are on the decline, but its 3d flexural strength first increases and then decrease, meanwhile, the 3d compressive strength of cement mortar show a slow downward trend; it has a very significant linear relationship between the 3d, 7d, 28d of the compressive strength and density of samples.

彩色透水混凝土在马尾生态休闲公园中的应用研究

高庆强

２０14年第3期

摘要

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摘要：结合福州市马尾区生态休闲公园景观工程，研究了透水混凝土在制备、浇筑和表面处理等工序中的关键技术。 Abstract：Base on the landscape project of ecological leisure park in Mawei District of Fuzhou City, some key technologies such as preparation, paving process and surface treatment of pervious concrete during the construction are studied.

混凝土结构钢筋保护层厚度偏差控制及检测

王佳燕

２０14年第3期

摘要

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摘要：阐述了钢筋混凝土保护层厚度偏差对钢筋混凝土结构的承载力、粘结锚固性和耐久性的影响。介绍了中国石化某分公司对炼化一体化工程污水处理场74m×36m×8m大型钢筋混凝土生化池保护层厚度偏差进行控制和检测情况。结果表明，由于采用水平筋交叉定位后用箍筋固定主筋、加设封闭箍筋以及在钢筋与模板之间支垫特制垫块对钢筋定位等措施，提高了钢筋铺设的准确性和稳定性，减少了钢筋位移。经检测，其钢筋保护层厚度合格点率达到95%以上，满足设计图纸和GB50204-2002规范要求。 Abstract: The affect of the thickness deviation of reinforced concrete cover on the bearing capacity, bonding anchoring and durability of the concrete structures are introduced. The concrete covers of 74m×36m×8m large salty and oily biochemical pool at wastewater treatment plant are controlled and detected by Rebar Detection System in a certain branch, SINOPEC. The results show that the bars are fixed more accurately and stably by using the measures of applying main bars fixed by stirrups after cross-positioning of horizontal bar, adding closed stirrups, and fixing bar with support pads of fluted fine stone concrete pad between the bars and shuttering formworks. The testing data show that the qualified rate of concrete cover thickness is more than 95% and meets the requirements of design blueprints and GB50204-2002 “Code for acceptance of constructional quality of concrete structures”.

冻融后玻化微珠保温承重混凝土力学性能退化规律研究

霍建梅，刘元珍，李珠，王文婧

２０14年第3期

摘要

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摘要：采用快冻法，对玻化微珠保温承重混凝土和普通混凝土进行了25次、30次、50次、75次冻融循环试验研究，根据试验结果得出了抗压强度随冻融循环的退化规律，建立了与冻融参数相关的退化计算公式。试验结果表明，随着冻融循环次数的增加，普通混凝土与玻化微珠保温承重混凝土立方体抗压强度呈下降趋势，但玻化微珠保温承重混凝土的抗压强度下降趋势缓和，对冻融循环较不敏感，这说明玻化微珠保温承重混凝土抗冻性能优于普通混凝土，且冻融次数越多越明显。 Abstract: Using fast freeze-thaw method, the freeze-thaw tests with 25, 30, 50 and 75 cycles on the glazed hollow bead insulation concrete and ordinary concrete are carried out. Base on the test results, the degradation law between the compressive strength of concrete and the freeze-thaw cycles is attained, and the degradation formulas for compressive strength with the freeze-thaw cycles are established. The test results indicate that compressive strengths of the two kinds of concretes decrease with the increasing the freeze-thaw cycles, but the downward trend of compressive strength of glazed hollow bead insulation concrete is slower than that of the ordinary concrete, which shows that frost resistance of glazed hollow bead insulation concrete precedes that of ordinary concrete, especially under the condition of more freeze-thaw cycle number.

纤维泡沫混凝土强度的正交试验

杨瑞环，霍冀川，赵星，邓均，高亚

２０14年第3期

摘要

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摘要：采用正交试验法对9组纤维泡沫混凝土和1组泡沫混凝土进行强度试验，考察的因素有纤维种类、纤维掺量和纤维长度，同时对不同纤维与浆体基体的结合进行微观分析。通过正交试验的直观分析法比较各因素对纤维泡沫混凝土强度的影响。结果表明：在纤维种类、掺量以及长度三因素中，纤维掺量对纤维泡沫混凝土的强度影响最大，纤维长度影响最小；同时，加入适量的纤维可以提高泡沫混凝土的强度，抗折强度比抗压强度提高更为显著。 Abstract：The compressive strength and flexural strength of 9 groups of foam concrete specimens and 1 group of foam concrete specimen are tested using the orthogonal experimental method to study the affect of fiber types, fiber contents and fiber lengths on the mechanical properties of foam concrete, and analyze the binding performance of fiber and cement mortar. The test results show that the fiber contents play the most important role in improving strengths of fiber foam concrete, and the role of fiber lengths is the smallest in the three factors. In addition, adding the right content of fiber can improve the strength of foam concrete, and the flexural strength of foam concrete improves higher than that of its compressive strength.

预应力筋材内嵌加固法在混凝土梁中的试验研究

李慧敏，丁亚红

２０14年第3期

摘要

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摘要：使用预应力筋材内嵌加固工艺，对10根混凝土梁试件进行了加固后的试验研究。试验证明，预应力筋材内嵌加固法，能够很好地改善混凝土梁试件的整体稳定性，加固后混凝土梁试件的开裂荷载值、屈服荷载值和极限荷载值有显著提高。随加固量及张拉预应力值的不同，加固梁的开裂荷载值提高了72.6%～321.26%，屈服荷载值提高了6.19%～99.09%，极限荷载值提高了46.04%～135.27%。说明预应力筋材内嵌加固法能够有效改善加固梁的延性和安全性能，刚度也有明显提高，对裂缝的产生和发展都有约束作用，同时螺旋肋钢丝的高强性能也得到了充分发挥。Abstract:Theprestressednearsurfacemountedhelicalribsteelwiretensionsystemisadopted,usingtheprocessofslotting,reinforcingandtensioninghelicalribsteelwire,fillingglue,andinthispaper,anexperimentalstudyisconductedon10RCbeamswithprestressednearsurfacemountedhelicalribsteelwire.Theexperimentalresultsindicatethatthismethodcouldimprovetheoverallperformanceofthereinforcedbeams,andfirst-crackload,flexuralload,ultimateloadareincreasedeffectively.Withthenumberofhelicalribsteelwireandprestressedlevel,first-crackloadisincreasedby72.6%～321.26%,flexuralloadisincreasedby6.19%-99.09%,ultimateloadisincreasedby46.04%～135.27%,theeffectisobvious.Thisreinforcingmethodcouldeffectivelyimprovetheductility,safetyperformance,thestiffnessofreinforcedbeam,andtheemergenceanddevelopmentofcrackscouldbeconstrained,andthehighstrengthofhelicalribsteelwirehasbeenfullyplay.

养护制度对高强度纤维增强水泥基复合材料（FRCC）性能影响的试验研究

姚山1,2，柴传政1，戴玲1，翟继钊1

２０14年第3期

摘要

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摘要：采用52.5R硅酸盐水泥、标准砂、硅灰、粉煤灰、高效减水剂、钢纤维、聚乙烯醇纤维等原材料配制高强度纤维增强水泥基复合材料(FRCC)，在标准养护条件下，进行不同龄期、不同纤维种类及不同纤维掺量的试验研究，试验结果表明，采用标准养护制度，90d龄期时，FRCC能够达到实际工程要求的抗压强度和抗折强度。 Abstract：The high-performance FRCC （Fiber Reinforced Cementitious Composite）was prepared by using 52.5R Portland cement, standard sand, volatilized silica, fly ash, super plasticizer, steel fibers, polyvinyl alcohol fibers and other materials. Under the condition of standard curing, the influences of different age, different kinds and content of fibers on the FRCC were studied. The results show that FRCC has high compressive strength and flexural strength, which can meet the load requirements of engineering practice at age of 90d.

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