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电厂燃煤炉渣在预拌砂浆中的应用技术研究
电厂燃煤炉渣在预拌砂浆中的应用技术研究
  • 高仁辉1,曹巍缤2,庞超明3,*,刘家彬2,秦鸿根3
20223年第9期
摘要
引用本文
摘   要:分析了电厂燃煤炉渣的基本性能,设计了一种炉渣吸水率快速测试方法,研究了炉渣等体积替代部分河砂对不掺和掺机制砂预拌砂浆工作性和力学性能的影响。结果表明:炉渣具有质轻、多孔、吸水率高的特点,其中粒径在0.60 mm以下的颗粒占比在60%左右;用粒径为0~4.75 mm的烘干炉渣等体积替代10%、20%的河砂,会导致不掺机制砂的M10预拌砂浆的稠度和强度降低;用粒径为0~4.75 mm的饱和面干状态的炉渣等体积替代20%、40%的河砂,同时掺入适量砂浆改性剂和调节剂,可制备出性能要求满足M10的掺机制砂预拌砂浆,但其稠度仍明显低于未掺炉渣组的稠度;用粒径为0~0.60 mm的炉渣等体积替代38%、76%的同粒径河砂,同时掺入适量附加水、减水剂、砂浆改性剂和调节剂,可制备出性能要求满足M7.5、M10和M15的掺机制砂预拌砂浆,且其稠度较大,强度较高,其中,附加水量按炉渣质量乘以炉渣1 h吸水率的60%~70%计算;掺入适量激发剂可提高炉渣细粒料(粒径0~0.60 mm)的活性。 Abstract: The basic properties of coal-fired slag were analyzed, and a rapid testing method for water absorption rate of coal-fired slag was designed, and the effects of replacing part of river sand with coal-fired slag on the workability and mechanical properties of ready-mixed mortar without and with machine-made sand were studied. The results show that the coal-fired slag is lightweight, porous, and has a high water absorption rate, and the proportion of particles with the particle size below 0.60 mm is about 60%. Replacing 10% and 20% of river sand with the drying coal-fired slag with the particle size of 0~4.75 mm can lead to a decrease in the consistency and strength of M10 ready-mixed mortar without machine-made sand. Replacing 20% and 40% of river sand with coal-fired slag in a saturated surface dry state with the particle size of 0~4.75 mm, and adding an appropriate content of mortar modifier and regulator, the ready-mixed mortar with machine-made sand that meets the performance requirements of M10 can be prepared, but its consistency is still significantly lower than that of the group without coal-fired slag. Replacing 38% and 76% of the same particle size river sand with coal-fired slag with the particle size of 0~0.60 mm, and adding an appropriate content of additional water, water reducing agent, mortar modifier and regulator, the ready-mixed mortar with machine-made sand that meets the performance requirements of M7.5, M10 and M15 can be prepared, and the consistency and strength are high. Among which, the additional water content can be calculated by multiplying the coal-fired slag mass by 60%~70% of the 1 h water absorption rate of coal-fired slag. Adding an appropriate content of activator can improve the activity of fine-grained coal-fired slag with particle size of 0~0.60 mm.
高仁辉,曹巍缤,庞超明,等.电厂燃煤炉渣在预拌砂浆中的应用技术研究[J].混凝土与水泥制品,2023(9):80-85. GAO R H,CAO W B,PANG C M,et al.Study on application technology of coal-fired slag in ready-mixed mortar[J].China Concrete and Cement Products,2023(9):80-85.
CO2矿化养护建筑垃圾再生砖的性能研究
CO2矿化养护建筑垃圾再生砖的性能研究
  • 王 震1,2,周文嘉3,李有财4,朱亮亮3,*,刘立熙5,*,陈 曦6
2023年第9期
摘要
引用本文
摘   要:以建筑垃圾为主要原材料制备了建筑垃圾再生砖,研究了CO2矿化养护时间(2、6、12、24 h)和CO2浓度(20%、30%、50%)对建筑垃圾再生砖抗压强度和固碳率的影响。结果表明:随着CO2矿化养护时间的增加,试件的抗压强度和固碳率增大;随着CO2浓度的增加,试件的抗压强度在CO2矿化养护6 h内呈增大趋势,在CO2矿化养护12 h后呈先增大后减小的趋势;试件的固碳率随着CO2浓度的增加而增大;综合考虑成本、抗压强度和固碳率,推荐CO2矿化养护时间为12 h,CO2浓度为20%。 Abstract: Using construction wastes as the main raw materials, the construction waste recycled bricks were prepared. The effects of CO2 mineral curing time (2, 6, 12, 24 h) and CO2 concentration (20%, 30%, 50%) on the compressive strength and carbon sequestration rate of construction waste recycled bricks were studied. The results show that as the CO2 mineral curing time increases, the compressive strength and carbon sequestration rate of the specimens increase. With the increase of CO2 concentration, the compressive strength of the specimen shows an increasing trend within 6 hours of CO2 mineral curing, and a first increasing and then decreasing trend after 12 hours of CO2 mineral curing. The carbon sequestration rate of the specimen increases with the increase of CO2 concentration. Taking into account cost, compressive strength, and carbon sequestration rate, it is recommended that the CO2 mineral curing time is 12 hours and the CO2 concentration is 20%.
王震,周文嘉,李有财,等.CO2矿化养护建筑垃圾再生砖的性能研究[J].混凝土与水泥制品,2023(9):86-89. WANG Z,ZHOU W J,LI Y C,et al.Study on properties of construction waste recycled bricks with CO2 mineral curing[J].China Concrete and Cement Products,2023(9):86-89.
不同状态铝土尾矿泥对泡沫混凝土性能的影响
不同状态铝土尾矿泥对泡沫混凝土性能的影响
  • 秦金喜1,吕政凡2,*
2023年第9期
摘要
引用本文
摘   要:为了提高铝土尾矿泥(以下简称尾泥)的资源化利用率,根据含水量对广西某岩溶洼地型排泥库的尾泥状态进行了分类,研究了不同状态尾泥对W4密度等级泡沫混凝土工作性、力学性能、体积吸水率和孔结构的影响,并进行了微观分析。结果表明:尾泥状态大致分为可塑态、软塑态、流塑态和高流塑态;采用软塑态尾泥制备的泡沫混凝土性能不满足相关标准要求;采用流塑态和高流塑态尾泥制备的泡沫混凝土性能基本一致,且满足相关标准要求。 Abstract: In order to improve the resource utilization rate of alumina tailings mud, the alumina tailings mud of a mud dump in a karst depression in Guangxi was classified based on the moisture content. The effects of alumina tailings mud in different states on workability, mechanical properties, volume water absorption rate and pore structure of W4 density grade foamed concrete were studied, and the microscopic analysis was carried out. The results show that the alumina tailings mud can be roughly divided into plastic state, soft plastic state, flow plastic state and high flow plastic state. The performance of foamed concrete prepared with soft plastic alumina tailings mud does not meet the requirements of relevant standards. The performance of foamed concrete prepared with flow plastic and high flow plastic alumina tailings mud is basically the same, and meets the requirements of relevant standards.
秦金喜,吕政凡.不同状态铝土尾矿泥对泡沫混凝土性能的影响[J].混凝土与水泥制品,2023(9):90-93,99. QIN J X,LYU Z F.Effect of different states of alumina tailings mud on properties of foamed concrete[J].China Concrete and Cement Products,2023(9):90-93,99.
粉煤灰和硅灰对砂浆抗碳酸腐蚀性能的影响
粉煤灰和硅灰对砂浆抗碳酸腐蚀性能的影响
  • 杨 静1,杨 林2,3,卫海涛 4
2023年第9期
摘要
引用本文
摘   要:为了提高水泥基材料的抗碳酸腐蚀性能,通过碳酸腐蚀前后砂浆的外观、质量、抗压强度和腐蚀深度的变化,研究了粉煤灰和硅灰的掺量、掺入方式(单掺、复掺)对砂浆抗碳酸腐蚀性能的影响。结果表明:单掺时,粉煤灰和硅灰的最佳掺量分别为15%、5%;复掺时,当m粉煤灰∶m硅灰=7∶3时,砂浆的抗碳酸腐蚀性能最佳,且优于单掺粉煤灰或硅灰砂浆的性能。 Abstract: In order to improve the carbonic acid corrosion resistance of cement-based materials, the effects of the contents and addition methods(single addition or compound addition) of fly ash and silica fume on the carbonic acid corrosion resistance of mortar were studied by examining the changes in appearance, mass, compressive strength, and corrosion depth of mortar before and after carbonic acid corrosion. The results show that the optimal content of fly ash and silica fume is 15% and 5% respectively when added alone. When mixed, the mortar has the best carbonic acid corrosion resistance when mfly ash∶msilica fume is 7∶3, and which is superior to the performance of the mortar when only fly ash or silica fume is added.
杨静,杨林,卫海涛.粉煤灰和硅灰对砂浆抗碳酸腐蚀性能的影响[J].混凝土与水泥制品,2023(9):94-99. YANG J,YANG L,WEI H T.Effect of fly ash and silica fume on carbonic acid corrosion resistance of mortar[J].China Concrete and Cement Products,2023(9):94-99.
稻壳灰混凝土的性能研究进展
稻壳灰混凝土的性能研究进展
  • 刘 坤1,刘华新1,刘 娜2
2023年第9期
摘要
引用本文
摘   要:介绍了稻壳灰的制备方法及基本性质,总结了稻壳灰对混凝土耐久性能、力学性能和工作性的影响,分析了稻壳灰对混凝土性能的作用机理,并对稻壳灰混凝土的未来研究方向进行了展望。 Abstract: The preparation method and basic properties of rice husk ash are introduced, and the influence of rice husk ash on the durability, mechanical properties and workability of concrete is summarized. The mechanism of rice husk ash on concrete performance is analyzed, and the future research direction of rice husk ash concrete is prospected.
刘坤,刘华新,刘娜.稻壳灰混凝土的性能研究进展[J].混凝土与水泥制品,2023(9):100-104. LIU K,LIU H X,LIU N.Research progress on properties of rice husk ash concrete[J].China Concrete and Cement Products,2023(9):100-104.
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