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    蘇州混凝土水泥制品研究院有限公司

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    發布時間:2020-01-06 00:00:00
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    節能與環保

    再生微粉對超高性能混凝土力學性能和微觀結構的影響
    再生微粉對超高性能混凝土力學性能和微觀結構的影響
    • 何智海1,2,張夢圓1,詹培敏3,楊一凡1,蘭 波1
    2021年第5期
    摘要
    引用本文
    摘 ? 要:研究了兩種類型的再生微粉(混凝土粉和磚粉)取代部分硅灰對超高性能混凝土(Ultra-high Performance Concrete,UHPC)力學性能和微觀結構的影響。結果表明:混凝土粉的摻入降低了UHPC的力學性能,而磚粉取代15%硅灰時,UHPC的28 d抗壓強度和抗折強度分別達到了130 MPa和24 MPa,略高于基準組;相較于混凝土粉,在UHPC中摻入15%的磚粉能夠優化混凝土的內部結構;磚粉良好的微集料填充作用和火山灰效應增強了界面過渡區的黏結性能和水化產物的納觀力學性能,從而改善UHPC的微觀結構。 Abstract: The effect of replacing part of silica fume with two kinds of hybrid recycled powder (concrete powder and brick powder) on the mechanical properties and microstructure of ultra-high performance concrete (UHPC) was studied. The results show that the addition of concrete powder reduces the mechanical properties of UHPC, while the 28 d compressive strength and flexural strength of UHPC reach 130 MPa and 24 MPa respectively when 15% silica fume is replaced by brick powder, which are slightly higher than those of the reference group. Compared with concrete powder, mixing 15% brick powder in UHPC can optimize the internal structure of concrete. The good micro-aggregate filling effect and pozzolanic properties of brick powder enhance the cohesiveness of the interface transition zone and the nanomechanical properties of the hydration products, thus improving the microstructure of UHPC.
    何智海,張夢圓,詹培敏,等.再生微粉對超高性能混凝土力學性能和微觀結構的影響[J].混凝土與水泥制品,2021(5):85-90. HE Z H,ZHANG M Y,ZHAN P M,et al.Effect of Hybrid Recycled Powder on Mechanical Properties and Microstructure of Ultra-high Performance Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):85-90.
    利用電解錳渣制備活性粉末混凝土的研究
    利用電解錳渣制備活性粉末混凝土的研究
    • 季軍榮1,武雙磊2,陳 宇2,周 洲1,陳胡星2
    2021年第5期
    摘要
    引用本文
    摘 ? 要:研究了電解錳渣取代石英粉或礦渣微粉對活性粉末混凝土(RPC)強度、收縮率和重金屬浸出毒性的影響。結果表明:電解錳渣部分取代石英粉或礦渣微粉,RPC的抗壓強度總體上有所提高,而抗折強度稍有下降;干縮率與濕脹率均降低;重金屬浸出濃度均低于Ⅴ類地表水限值。 Abstract: The effects of electrolytic manganese residue instead of quartz powder or slag powder on the strength, shrinkage and heavy metal leaching toxicity of reactive powder concrete (RPC) were studied. The results show that using electrolytic manganese residue to partially replace quartz powder or slag powder, the compressive strength of RPC is generally improved, while the flexural strength is slightly reduced, the dry shrinkage and wet swelling rate of RPC are both reduced, and the leaching concentration of heavy metals is below Class V surface water limit.
    季軍榮,武雙磊,陳宇,等.利用電解錳渣制備活性粉末混凝土的研究[J].混凝土與水泥制品,2021(5):91-94,99. JI J R,WU S L,CHEN Y,et al.Study on the Preparation of Reactive Powder Concrete with Electrolytic Manganese Residue[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):91-94,99.
    不同材料增強處理再生骨料對混凝土抗壓強度的影響
    不同材料增強處理再生骨料對混凝土抗壓強度的影響
    • 孫柯華1,沈 陽2,王 偉3,羅 鋒3,楊雅詩4,韋建斌5,章樂遠3,馮興國3, 胡 坤3,徐逸文3
    2021年第5期
    摘要
    引用本文
    摘 ? 要:研究了水泥漿、偏高嶺土地聚物、摻粉煤灰偏高嶺土地聚物、水泥漿-偏高嶺土地聚物增強處理再生骨料對混凝土抗壓強度的影響。結果表明:四種增強材料處理的再生骨料對混凝土抗壓強度的影響順序大小為水泥漿-偏高嶺土地聚物>偏高嶺土地聚物>水泥漿>摻粉煤灰偏高嶺土地聚物。 Abstract: The effects of cement slurry, metakaolin geopolymer, metakaolin geopolymer with fly ash and cement slurry-metakaolin geopolymer on compressive strength of concrete were studied. The results show that the influence order of recycled aggregate reinforced by four materials on compressive strength of concrete is cement slurry-metakaolin geopolymer > metakaolin geopolymer > cement slurry > metakaolin geopolymer with fly ash.
    孫柯華,沈陽,王偉,等.不同材料增強處理再生骨料對混凝土抗壓強度的影響[J].混凝土與水泥制品,2021(5):95-99. SUN K H,SHEN Y,WANG W,et al.Effects of Recycled Aggregate Reinforced by Different Materials on Compressive Strength of Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):95-99.
    原狀粉煤灰-鐵尾礦泡沫混凝土的性能研究
    原狀粉煤灰-鐵尾礦泡沫混凝土的性能研究
    • 孫 婧1,2,3,王 宏1,陳 靜4,安艷玲1,蘭建偉1,劉宏波1,3
    2021年第5期
    摘要
    引用本文
    摘 ? 要:采用Design-Expert軟件研究了原狀粉煤灰及鐵尾礦砂對泡沫混凝土干密度、吸水率及抗壓強度的影響,并觀察了泡沫混凝土斷面的細觀結構。結果表明:原狀粉煤灰摻量的增加會使泡沫混凝土的干密度和吸水率降低,當原狀粉煤灰摻量占膠凝材料的40%時,泡沫混凝土的抗壓強度最高;固定粉煤灰摻量為40%,鐵尾礦砂摻量在0~50%范圍內增加會使泡沫混凝土的干密度和抗壓強度增加,吸水率降低;當原狀粉煤灰摻量<40%時,原狀粉煤灰摻量越多,泡沫混凝土內部的氣泡越穩定;鐵尾礦砂摻量的增加可使泡沫混凝土的孔徑減小,密實度增加。 Abstract: The influence of original fly ash and iron tailings on dry density, water absorption and compressive strength of foam concrete was studied by Design-Expert software, and the microstructure of foam concrete was observed. The results show that the dry density and water absorption rate of foam concrete decrease with the increase of raw fly ash content, and when the original fly ash content is 40%, the compressive strength of foam concrete is the highest. When the fixed fly ash content is 40%, the increase of iron tailings content in the range of 0~50% can increase the dry density and compressive strength of foam concrete, but reduce the water absorption. When the original fly ash content is less than 40%, the more the raw fly ash content, the more stable the bubbles inside the foam concrete. The increase of the iron tailings content can reduce the pore size of foam concrete and increase the density.
    孫婧,王宏,陳靜,等.原狀粉煤灰-鐵尾礦泡沫混凝土的性能研究[J].混凝土與水泥制品,2021(5):100-104. SUN J,WANG H,CHEN J,et al.Study on Properties of Original Fly Ash-iron Tailings Foam Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):100-104.
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