第八期_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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第八期

掺锂渣再生粗骨料混凝土抗压强度试验研究

于江，严文龙，秦拥军，罗玲

２０15年第8期

摘要

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摘要：锂渣及再生粗骨料对混凝土抗压强度有一定的影响，通过轴心抗压试验获得了立方体与棱柱体抗压强度之间的线性关系。结果表明，适量的再生粗骨料和锂渣可以有效提高混凝土28d抗压强度，当再生粗骨料取代率为30%，锂渣掺量为20%时，28d的立方体和棱柱体抗压强度最大，较同龄期下未掺锂渣的普通混凝土增长了39.1%和48.2%。 Abstract: Lithium slag and recycled coarse aggregates have a certain influence on the compressive strength of concrete, through the axial compressive test, the linear relationship of compressive strength between the cube and prism were obtained. The results show that the right amount of recycled coarse aggregate and lithium slag can effectively improve the 28d compressive strength. When the replacement rate of recycled coarse aggregate is 30% and the lithium slag content is 20%, the 28d compressive strength of cube and prism is the largest, is increased by 39.1% and 48.2% than the compressive strength of the ordinary concrete which is not added by lithium slag in the same age period.

建筑垃圾再生微粉的研究现状

毛新奇1,2，屈文俊1，朱鹏1

２０15年第8期

摘要

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摘要：建筑垃圾再生微粉各项性能的研究是推进建筑垃圾资源化的重要基础。根据近年来国内关于再生微粉的主要研究成果，对材料来源、制备工艺、工作性能、力学性能和耐久性能等方面进行了综述，并对相关的影响因素进行了探讨分析。 Abstract: Research on the properties of utilization regeneration of powder for construction waste is the important foundation of resource utilization of construction waste. Based on the recent domestic research on recycled powder, material source, manufacturing process, workability, mechanical properties and the durability are reviewed. Besides, the related influence factors are discussed and analyzed

冬季机场道面混凝土施工强度影响因素分析研究

岑国平1，秦湘辉1，李强2，李明2，龙小勇1，刘庆涛1，刘照炜3

２０15年第8期

摘要

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摘要：结合实际工程，模拟道面混凝土散热特点，研究了不同防冻剂掺量、保温措施、入模温度、环境温度对混凝土强度的影响规律。研究结果表明，随着环境温度的降低，混凝土强度降低，亚硝酸钠掺量低于2%不影响混凝土强度，超过4%则对混凝土强度造成一定损失。采用塑料海绵配合电热毯对试件进行保温加热、提高入模温度可以有效地提高混凝土强度。多元回归分析结果表明，保温措施对强度的影响最大。 Abstract: Combination with actual engineering, the effecting rules of different antifreeze agent dosage, heat preservation measures, molding temperature, environment temperature on concrete strength are investigated through simulating the heat dissipation characteristics of pavement concrete. The results show that the concrete strength reduces with the decreasing of temperature, sodium nitrite content less than 2% will not affect the strength of concrete, while sodium nitrite dosage more than 4% will cause a certain loss of concrete strength. The concrete strength can be enhanced by adopting plastic sponge and electric blanket for heat preservation or increasing molding temperature. The result of multiple regression analysis indicate that heat preservation measures is the biggest influence on strength.

管桩与塑料排水板处理软土地基试验研究

夏晋华

２０15年第8期

摘要

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摘要：为了消除管桩施工过程中超静孔隙水压对地基土层产生的不利影响，依托PHC管桩与塑料排水板处理某公路软土地基工程项目，进行了管桩挤土效应试验研究。在施工现场布置排水板间距分别为1.2m与2.4m的两个试验区，通过对管桩施工过程中孔隙水压力、土体侧向位移和地表沉降与隆起的对比测试，得到了不同排水板间距对抵消管桩挤土效应的效果。 Abstract: In order to eliminate the adverse effects of super pore pressure on the foundation soil in tubular pile construction process, the experiment research on squeezing effects of pipe pile is studied by PHC pipe pile and plastic drainage plate treatment in highway soft soil ground engineering project. Two test areas are arranged in construction site layout with 1.2meter drainage plate spacing and 2.4meter drainage plate spacing. Through the contrast tests on the pore water pressure, lateral displacement of soil and surface subsidence and uplift during pipe pile construction, influence of different drainage plate spacing on offsetting squeezing effects of pipe pile is carried out.

装配式密肋复合墙板吊装与施工验算

刘磊，陈国新，苏枋

２０15年第8期

摘要

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摘要：结合相关施工规范要求和复合墙板的构造特点，对墙板吊装方式、吊装施工进行研究，并通过工程算例校核复合墙板吊装的安全性。结果表明，密肋复合墙板、女儿墙、叠合板在脱模起吊、运输起吊时宜采用四点平吊，安装起吊时宜采用两点直吊；吊点宜对称布置在肋梁与肋柱交汇处。 Abstract: Combination with related construction specifications and structure features of composite wall, the wallboard lifting method, checking computation of lifting construction are studied and the safety of the composite wallboard hoisting for engineering calculation is passed. The results show that multi-ribbed composite wall, parapet and laminated board are used a four-point level lifting in stripping lifting and transportation lifting, while the multi-ribbed composite wall, parapet and laminated board are used two straight in installing lifting cranes; lifting points should be arranged symmetrically in the ribs and rib beams column interchange.

GB 50838—2015《城市综合管廊工程技术规范》修订说明

王恒栋

２０15年第8期

摘要

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摘要：介绍了GB 50838—2015《城市综合管廊工程技术规范》修订情况，按照国家产业政策导向的要求，强调了预制拼装综合管廊的工程示范意义。 Abstract: The revision note for national standard GB 50838—2015 Technical code for urban utility tunnel engineering is systematically introduced. And in accordance with the requirements of the national construction industry policy oriented, precast utility tunnel is emphasized in engineering demonstration application.

花岗岩环保型透水砖的研制

陈连发1，陈悦2，李龙3，陆洋4

２０15年第8期

摘要

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摘要：利用正交试验分析了制备透水砖过程中花岗岩骨料粒径、集灰比、水灰比、生石灰掺量等因素的影响并对其重要性进行排序。研究了各因素与抗压强度、抗折强度、透水系数和孔隙率的关系。讨论了静压成型压力和振动成型时间对孔隙率和透水系数的影响。根据混合材料最优配比参数，完成了制作透水砖的最佳配合比设计方案。试验证明：经加工处理后的花岗岩石材边角废料是制备环保型透水砖的有益材料。 Abstract: The effects of granite aggregate size, aggregate cement ratio, water cement ratio, lime dosage, etc. on performance of water permeable brick were analyzed by using orthogonal test and the importance of these factors were ranked. The relationships of orthogonal factors and the performance such as compressive strength, flexural strength, permeability coefficient and porosity were researched. The influence of static molding pressure and vibration molding time on the porosity and the permeability coefficient was discussed. The best mix design for making permeable brick was completed according to the optimal ratio of mixtures. The test results prove that: the leftover waste material granite after processing is a good material for preparing environmental permeable brick.

自保温砌块的热工测试与模拟

李萍，孙道胜，丁益，王爱国

２０15年第8期

摘要

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摘要：自保温砌块是发展新型保温建筑材料的必然，对国内墙体材料的革新和节能技术的发展具有促进作用。本文所设计的自保温砌块，利用已处理的煤矸石进行制备，并使用热流计法对煤矸石保温砌块进行热工性能测试，测试结果表明：所设计240块型满足项目对传热系数的要求，同时利用软件模拟了砌块在真实使用环境条件下的温度场，砌块在使用时热应力集中区向围护结构的热环境偏移，这对建筑节能材料的设计、施工和检测具有指导意义。 Abstract: Self-thermal insulation block is necessary to develop a new type of thermal insulation building material, which promotes the innovation for domestic wall materials and energy saving technology. The self-thermal insulation block is prepared by handled coal gangue. The thermal performance of self-thermal insulation block with coal gangue is studied by using heat flow mater, the test shows that type 240# can meet the requirements of the heat transfer coefficient for project. Temperature field of self-thermal insulation brick is simulated under real environmental conditions by software, it can be seen concentration area of thermal stress shifts to hot environment of building envelope, which is a guiding significance for the design, construction and detection of building energy-saving materials.

膜化剂对建筑垃圾再生砂浆的性能影响试验研究

杨子胜1，张瑾2，王爱勤1

２０15年第8期

摘要

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摘要：本试验将等质量板垃圾和柱垃圾破碎、筛分后制成再生砂，利用二水石膏、胶粉、纤维素醚等原料制备膜化剂并对建筑垃圾再生砂进行膜化处理，制备了CL和CLT两种试块，通过正交试验和方差分析研究了二水石膏、胶粉、纤维素醚对不同试块性能的影响。试验结果表明，抗压强度效果最好的膜化配比分别为4%石膏、2%胶粉、0.6%纤维素醚和4%石膏、3%胶粉、0.2%纤维素醚；抗折强度效果最好的膜化配比均为4%石膏、1%胶粉和0.2%纤维素醚，三种因素对吸水率影响都不大，但CLT试块的吸水率都小于CL试块。 Abstract: The construction waste reclaimed sand is produced by the same quality of plate waste and column waste which are crushed and screened. The membrane agent is prepared by mixing dihydrate gypsum, powder, cellulose ethers and other raw materials, and membrane treatment of construction waste reclaimed sand is carried out, which is produced for cement mortar of CL and CLT. The influence of dihydrate gypsum, powder, cellulose ethers on performance of different blocks is studied by the method of orthogonal level analysis and variance analysis. The results show that the best membrane of the compressive strength ratio is 4% gypsum, 2% powder, 0.6% cellulose and 4% gypsum, 3% powder, 0.2% cellulose respectively. The best membrane of the flexural strength ratio is 4% gypsum, 1% powder and 0.2% cellulose ethers. Three factors have little effects on its absorption. However, the absorption rate of CLT block is less than the CL block.

BFRP与CFRP加固剪力墙抗震性能比较分析

封卉梅1，赵军2

２０15年第8期

摘要

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摘要：进行了6片碳纤维片材和玄武岩纤维片材加固钢筋混凝土墙在低周反复荷载下的试验研究，并基于试验结果，对这两种类型纤维片材加固钢筋混凝土剪力墙的加固效果进行了对比分析。结果表明，玄武岩纤维片材加固剪力墙在延性及耗能能力方面表现出来的抗震性能可与碳纤维片材加固的效果媲美，有些方面甚至超过碳纤维片材加固的效果，而玄武岩纤维的价格比碳纤维的价格低廉许多，具有更好的经济性。 Abstract：Experimental study on 6 sheet carbon fiber sheet and basalt sheet reinforced concrete wall under low cyclic loading is carried out. Based on the test results, analysis on the two types of reinforcement effect with fiber sheet strengthening reinforced concrete shear wall is compared. The results show that, seismic performance of basalt fiber sheet reinforced shear wall is comparable to reinforcement effect of carbon fiber in some respects of ductility and energy dissipation capacity, that is better than carbon fiber reinforcement in some respects, and basalt fiber prices is cheaper than carbon fiber which has better economy.

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