第十一期_2019_《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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第十一期

废弃混凝土再生微粉胶凝性能的试验研究

陈曦，李滢，庄平英

２０19年第11期

摘要

引用本文

摘要：研究了实验室破碎废弃混凝土过程中产生的再生微粉的性能，并将再生微粉以不同比例掺入水泥净浆、砂浆及混凝土中，研究其影响规律。结果表明，再生微粉具有潜在活性，可以替代水泥胶凝材料；随着再生微粉取代率的增加，水泥净浆标准稠度用水量增加、凝结时间延迟，水泥胶砂流动度减小；当再生微粉取代率大于20%时，砂浆强度降低明显；当再生微粉取代率为20%时，混凝土各龄期强度均为最高，其28 d抗压强度达到48.16 MPa；随着水化龄期的增加，各取代率下的强度比差异越来越小，再生微粉混凝土后期强度增长较快。 Abstract: The properties of the recycled fine powder(RFP) produced in the process of crushing waste concrete in the laboratory were studied, and the RFP was mixed into cement paste, mortar and concrete in different proportions to investigate its influencement. The results show that the RFP has potential activity and can replace cementitious materials. With the increase of the replacement rate of RFP, the water consumption of cement paste standard consistency increases and the setting time of cement paste is delayed, and the fluidity of cement mortar decreases. The strength of mortar decreases when the replacement rate of RFP exceeds 20%. When the replacement rate of RFP is 20%, the strength of concrete at each age is the highest, and the 28 d compressive strength of concrete reaches 48.16 MPa. With the increase of hydration age, the strength ratio under each substitution rate is getting smaller and smaller, and the strength of concrete at late age grows faster.

陈曦,李滢,庄平英.废弃混凝土再生微粉胶凝性能的试验研究[J].混凝土与水泥制品,2019(11):96-100. CHEN X,LI Y,ZHUANG P Y.Experimental Study on Cementitious Properties of Recycled Fine Powder from Waste Concrete[J].China Concrete and Cement Products,2019(11):96-100.

粒化高炉矿渣代砂高性能水泥基材料力学性能正交试验

石东升1，李科1，薛欣欣1，韩佳彤2

２０19年第11期

摘要

引用本文

摘要：基于正交分析法研究了不同因素对粒化高炉矿渣代砂高性能水泥基材料力学性能的影响。通过分析水胶比、代砂率和养护制度三种因素对高性能水泥基材料力学性能的影响，确定了不同因素对抗压强度影响的主次顺序以及各因素的最优水平组。结果表明，不同因素对抗压强度影响的主次顺序均为：养护条件＞水胶比＞代砂率；对抗折强度影响的主次顺序为：代砂率＞水胶比＞养护条件；抗压强度随着水胶比的增大而降低，随着代砂率的增大而呈现出先增大后减小的趋势，而抗折强度随着水胶比与代砂率的增大均呈下降趋势；相比于标准养护，蒸压与低压蒸汽养护均能提高粒化高炉矿渣代砂高性能水泥基材料的抗压强度，且蒸压养护＞低压蒸汽养护＞标准养护；显微测试结果表明，采用粒化高炉矿渣代替细骨料能够有效提高水泥基材料的抗压强度。 Abstract: Based on the orthogonal analysis method, the effects of different factors on the mechanical properties of high performance cement-based materials containing granulated blast furnace slag (GBFS) as fine aggregate were studied. By analyzing the effects of water-binder ratio, sand replacement ratio and curing schedule on the mechanical properties of high performance cement-based materials, the important order of the influence of different factors on the compressive strength and the optimal level of each factor were determined. The results show that the important order of different factors on the compressive strength is: curing schedule > water- binder ratio > sand replacement ratio. The important order of different factors on the flexural strength is: sand replacement ratio > water-binder ratio > curing schedule. The compressive strength decreases with the increase of water-binder ratio, the compressive strength increases first and then decreases with the increase of sand replacement ratio, the flexural strength decreases with the increase of water-to-binder ratio and sand replacement ratio. Both autoclave and steam curing can improve the compressive strength of GBFS high performance cement-based materials for sand replancement, and autoclave curing > low pressure steam curing > standard curing. Microscopic test results show that using granulated blast furnace slag instead of fine aggregate can effectively improve the compressive strength of cement-based materials.

石东升,李科,薛欣欣,等.粒化高炉矿渣代砂高性能水泥基材料力学性能正交试验[J].混凝土与水泥制品,2019(11):92-95. SHI D S,LI K,XUE X X,et al.Mechanical Properties of High Performance Cement-based Materials for Granulated Blast Furnace Slag Based on Orthogonal Test[J].China Concrete and Cement Products,2019(11):92-95.

基于泡沫混凝土技术的桥头跳车处治研究

吴颖峰

２０19年第11期

摘要

引用本文

摘要：路桥过渡段用泡沫混凝土代替传统的填料进行浇筑，为缓解桥头跳车问题提供了一种新的途径。本文进行正交设计试验，对泡沫混凝土的抗压强度、吸水率和流动度等指标进行了分析研究；通过验证试验确定了最终的推荐最佳组合，并提出了标准化施工工艺流程与相应的施工要求。 Abstract: Traditional filler is replaced by foam concrete between the abutment and the subgrade, which can alleviate bump at approaches to the bridge. The orthogonal test is carried out to analyze the compressive strength, water absorption rate and fluidity of foam concrete. The best recommended combination is determined by verification test, and the standardized construction process and corresponding construction requirements are proposed.

吴颖峰.基于泡沫混凝土技术的桥头跳车处治研究[J].混凝土与水泥制品,2019(11):85-88. WU Y F.Research on Treatment of Bump at Approaches to the Bridge Based on Foam Concrete Technique[J].China Concrete and Cement Products,2019(11):85-88.

中美砌体结构技术标准对比研究

方坤1，姚国友2，杨林丽3，唐文哲1

２０19年第11期

摘要

引用本文

摘要：以中美两国砌体结构技术标准为研究对象，从标准体系、逻辑结构和具体条款等方面出发，对比了中国GB 50003—2011《砌体结构设计规范》和美国ACI530—2011《砌体结构规范》的异同，阐述了两者的特点及差异，分析了各自的细致程度及对工期、造价等的影响，分析结论可为国际工程顺利开展提供技术支持和履约保障。 Abstract: The technical standards of masonry structure between China and the United States was compared. From the aspects of standard system, logical structure and specific terms, the Chinese National Standard GB 50003—2011"Code for design of masonry structures" and the American Concrete Association standard ACI 530—2011"Building Code Requirements and Specification for Masonry Structures". Specifically, the characteristics and differences of the standards were showed and their impact on construction period, cost, etc were analyzed. The results can provide assistance for two development of international projects and provide guarantee for strengthening the performance capability.

方坤,姚国友,杨林丽,等.中美砌体结构技术标准对比研究[J].混凝土与水泥制品,2019(11):82-84. FANG K,YAO G Y,YANG L L,et al.Comparative Study on the Technical Standards of Masonry Structures between China and the United States[J].China Concrete and Cement Products,2019(11):82-84.

JG/T 408—2013《钢筋连接用套筒灌浆料》修订及专项试验研究介绍

蒋勤俭1，吴焕娟1，钱冠龙2，张亚梅3，沙建芳4，李晨光5

摘要

引用本文

摘要：JG/T 408—2013《钢筋连接用套筒灌浆料》标准修订对套筒灌浆料的技术性能试验研究以及灌浆施工时不同环境温度类别（低温、常温）提出了新的要求，并结合工程应用，对材料要求、试验要求等章节进行了修改完善，以更好地保证套筒灌浆连接施工质量。本文对该标准主要修订内容和相关试验研究进行了介绍。 Abstract：The revision of JG/T 408—2013 Cementitious Grout for Sleeve of Rebar Splicing has put forward new requirements for the technical performance test and research of sleeve grouting material and different environmental temperature categories (low temperature and normal temperature) during grouting construction. Combined with the engineering application, the material requirements, test requirements and other chapters are modified and improved to better ensure the construction quality of sleeve grouting connection. Here, the main revisions of the standard and related experimental research are introducesd.

蒋勤俭,吴焕娟,钱冠龙,等.JG/T 408—2013《钢筋连接用套筒灌浆料》修订及专项试验研究介绍[J].混凝土与水泥制品,2019(11):78-81. JIANG Q J,WU H J,QIAN G L,et al.Revision Introduction of JG/T 408 — 2013 Cementitious Grout for Sleeve of Rebar Splicing and Special Test Research[J].China Concrete and Cement Products,2019(11):78-81.

早强剂对修补砂浆力学性能和黏结性能的影响研究

马建斌

２０19年第11期

摘要

引用本文

摘要：高性能修补砂浆能够较好地弥补由环境侵蚀引起的混凝土结构表面破坏、保护层脱落及钢筋外露等缺陷。为研制高性能修补砂浆，首先加入甲酸钙和乙酸钙两种早强剂来提高普通硅酸盐水泥砂浆的早期抗折强度和抗压强度，并探究了聚合物掺量对其黏结强度的影响。结果表明，两种早强剂的最佳掺量分别为1%和0.5%，聚合物的最佳掺量为10%。 Abstract: Defects such as surface damage of concrete structures, peeling off of protective layers and exposed steel bars caused by environmental erosion can be well compensated by high performance repair mortar. In order to develop high performance repair mortar, two early strength agents of calcium formate and calcium acetate were first added to improve the early flexural strength and compressive strength of ordinary Portland cement mortar, and the effect of polymer content on its bond strength was explored. The results show that the optimum dosage of the two early strength agents is 1% and 0.5% respectively, and the optimum dosage of the polymer is 10%.

马建斌.早强剂对修补砂浆力学性能和黏结性能的影响研究[J].混凝土与水泥制品,2019(11):74-77. MA J B.Effect of Early Strength Agent on Mechanical Properties and Bonding Properties of Repairing Mortar[J].China Concrete and Cement Products,2019(11):74-77.

柱端箍筋不同加密的钢筋混凝土柱的抗震性能分析

张炳晖，杨玉红，赵亚涛，包恩和，陈宜虎

２０19年第11期

摘要

引用本文

摘要：为进一步明确柱端箍筋配置对钢筋混凝土柱的抗震性能影响，以柱端箍筋配置为主要研究参量，浇注4根钢筋混凝土柱试件。对各试件进行反复加载试验，研究各试件的滞回曲线、骨架曲线、承载能力、刚度退化及能量耗散系数等。结果表明，对柱端轴向0~250 mm范围内的箍筋进行加密，有增大试件的最大承载力和控制试件破坏之前的剪切变形量的作用；随着箍筋加密区的增大，试件的延性和耗能性能提升；随着加载循环次数的增大，各试件的承载力和刚度减小。 Abstract: In order to investigate the influence of different stirrup configurations at column ends on the seismic performance of RC column, the stirrup configurations at column ends was taken as the main research parameters, and four sets of RC column specimens were designed. Reversed cyclic loading tests were conducted on each specimen to study the hysteretic curve, skeleton curve, bearing capacity, stiffness degradation and energy dissipation coefficient. The results show that encrypting the stirrups in the range of 0~250 mm in the axial direction of the column ends can increase the maximum bearing capacity of specimens and control the degree of shear deformation before the failure of specimens. With the decrease of the stirrup spacing in stirrups encryption area at column ends, the ductility and energy dissipation capacity of the specimen increases. With the loading cycles increase, the bearing capacity and stiffness of each specimen decrease.

张炳晖,杨玉红,赵亚涛,等.柱端箍筋不同加密的钢筋混凝土柱的抗震性能分析[J].混凝土与水泥制品,2019(11):70-73+77. ZHANG B H,YANG Y H,ZHAO Y T,et al.Analysis of Seismic Performance of Reinforced Concrete Columns with Different Encryption of Column End Stirrups[J].China Concrete and Cement Products,2019(11):70-73+77.

预湿骨料对陶粒混凝土性能影响的试验研究

穆龙飞，李思琪，冯竟竟，杨进波

２０19年第11期

摘要

引用本文

摘要：为研究陶粒饱水程度对陶粒混凝土力学性能及热工性能的影响，设置了六组不同预湿时间的试验组进行探究。结果表明，陶粒预湿时间越长，陶粒混凝土7 d强度越低，28 d强度越高；陶粒混凝土导热系数与蓄热系数随陶粒骨料饱水程度的增加而有所提升；陶粒预湿后期存在释水现象，释出水分补充到陶粒骨料与浆体连接面，供给胶凝材料持续硬化。 Abstract: Six experimental groups with different prewetting time were set up to investigate the effect of the degree of water content on the mechanical properties and thermal properties of ceramsite concrete. The results show that the longer the prewetting time of ceramsite concrete, the lower of its 7 days strength and the higher of its 28 days strength. The thermal conductivity and heat storage coefficient of the ceramsite concrete improve with the increase of the degree of water fullness of the ceramsite concrete. There is water release phenomenon in the post-prewetting stage of ceramsite grains, and it supplements the water content of the connection surface between the ceramsite aggregate and the mortar, and supplies the cement material for continuous hardening.

穆龙飞,李思琪,冯竟竟,等.预湿骨料对陶粒混凝土性能影响的试验研究[J].混凝土与水泥制品,2019(11):66-69. MU L F,LI S Q,FENG J J,et al.Study on Effect of Prewet Aggregate on Performance of Ceramsite Concrete[J].China Concrete and Cement Products,2019(11):66-69.

冻融作用下煤矸石陶粒混凝土劣化规律及寿命预测

邱继生，王斌，关虓，熊光红，秦卿

２０19年第11期

摘要

引用本文

摘要：通过对不同煤矸石陶粒掺量（0、20%、40%、60%）的混凝土进行快速冻融循环试验，探究了冻融循环后煤矸石陶粒混凝土的表面劣化、质量损失率和相对动弹性模量的变化规律，以不同冻融循环次数下煤矸石陶粒混凝土的动弹性模量为损伤变量，建立了煤矸石陶粒混凝土冻融损伤劣化模型，并对其在自然冻融环境下的寿命进行了预测。研究结果表明，随着冻融循环次数的增加，煤矸石陶粒混凝土的抗冻性能逐渐降低，但降低幅度有所不同；随着煤矸石陶粒取代率的增加，混凝土的抗冻性能呈现先下降后提高再下降的趋势；建立的煤矸石陶粒混凝土冻融损伤劣化模型与试验结果符合较好，具有较高的精度；当煤矸石陶粒掺量为40%时，混凝土的抗冻性能效果最佳，抗冻耐久性寿命最长。 Abstract: The rapid freeze-thaw cycling tests of concrete blocks with different content of coal gangue ceramsite (0, 20%, 40%, 60%) were carried out to study the variation regularities of surface deterioration, mass loss rate and relative dynamic elastic modulus of coal gangue ceramsite concrete after freeze-thaw cycling, and the dynamic elastic modulus of coal gangue ceramsite concrete with different freeze-thaw cycles was used as the damage variable and the freeze-thaw damage deterioration model of coal gangue ceramsite concrete was established and its life under natural freeze-thaw environment was predicted. The results show that with the increase of freeze-thaw cycles, the frost-resistance of coal gangue ceramsite concrete decreases gradually, but the decreasing range is different. With the increase of the replacement rate of coal gangue ceramsite, the frost-resistance of concrete decreases first, then increases and then decreases. The freeze-thaw damage deterioration model of coal gangue ceramsite concrete is in good agreement with the experimental results and has high accuracy. When the content of coal gangue ceramsite is 40%, the frost-resistance of concrete is the best, and the life of frost-resistance is the longest.

邱继生,王斌,关虓,等.冻融作用下煤矸石陶粒混凝土劣化规律及寿命预测[J].混凝土与水泥制品,2019(11):61-65. QIU J S,WANG B,GUAN X,et al.Deterioration Rule and Life Prediction of the Coal Gangue Ceramsite Concrete under Freeze-thaw Cycles[J].China Concrete and Cement Products,2019(11):61-65.

稳泡剂改善火山灰泡沫混凝土性能研究

史星祥1，张磊蕾2，满丽莹1，田寅1

２０19年第11期

摘要

引用本文

摘要：采用硬脂酸钙和一种实验室自制的外加剂作为稳泡剂，通过双氧水化学发泡方法，制备了火山灰泡沫混凝土（VAFC）。研究了两种稳泡剂单掺和复掺对VAFC成型状态、干密度、抗压强度、吸水率、导热系数和孔结构的影响。试验结果表明，硬质酸钙可以作为稳泡剂改善孔结构提高抗压强度，同时也具有很好的憎水效果，显著降低吸水率；而使用自制稳泡剂时，对VAFC抗压强度会产生负面影响，对吸水率改善效果一般。VAFC的孔结构影响材料的保温性能，相近干密度情况下，气孔孔径越小，连通孔越少，导热系数越低；使用自制稳泡剂制备的VAFC，孔径在0.5~1 mm之间，气孔呈球状，连通孔很少，导热系数较低；而使用硬脂酸钙时，孔径在1~2 mm之间，部分气孔呈不规则状，且存在少量连通孔，导热系数相对较高。硬脂酸钙和自制稳泡剂复合使用，可以达到协同增效的作用，使VAFC在力学性能和保温性能两个方面均达到较为理想的水平。 Volcanic ash foam concrete is prepared by hydrogen peroxide chemical foaming method using calcium stearate and an admixture produced in laboratory as foam stabilizer. The effects of two admixtures on forming state, dry density, compressive strength, water absorption rate, thermal conductivity and pore structure of VAFC are researched. The results show that taking as foam stabilizer, calcium stearate can not only improve the pore structure and compressive strength, but also have the hydrophobic effect which decreases the absorption ratio significantly. But the compressive strength of VAFC decreases and the hydrophobic effect is not that well when using self-made foam stabilizer. The pore structure of VAFC affects the thermal insulation performance. Under the condition of similar dry density, small pore size and few connecting holes in concrete results in low thermal conductivity. The pore size is at the range of 0.5~1 mm, the shape of the pores are circular, the connecting holes are few and the thermal conductivity is low when using the self-made foam stabilizer. In the otherwise, the pore size is at the range of 1~2 mm, the shape of the pores are irregular, the thermal conductivity are few and the heat conductivity coefficient is high when using calcium stearate. The combination of calcium stearate and self-made foam stabilizer can achieve synergistic effect, which makes the mechanical properties and thermal insulation properties of VAFC reach an ideal level.

史星祥,张磊蕾,满丽莹,等.稳泡剂改善火山灰泡沫混凝土性能研究[J].混凝土与水泥制品,2019(11):57-60. SHI X X,ZHANG L L,MAN L Y,et al.Effect of Foam Stabilizer on Performance of Volcanic Ash Foam Concrete[J].China Concrete and Cement Products,2019(11):57-60.

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