节能与环保_2021_《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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节能与环保

再生微粉对超高性能混凝土力学性能和微观结构的影响

何智海1,2，张梦圆1，詹培敏3，杨一凡1，兰波1

2021年第5期

摘要

引用本文

摘要：研究了两种类型的再生微粉（混凝土粉和砖粉）取代部分硅灰对超高性能混凝土（Ultra-high Performance Concrete，UHPC）力学性能和微观结构的影响。结果表明：混凝土粉的掺入降低了UHPC的力学性能，而砖粉取代15%硅灰时，UHPC的28 d抗压强度和抗折强度分别达到了130 MPa和24 MPa，略高于基准组；相较于混凝土粉，在UHPC中掺入15%的砖粉能够优化混凝土的内部结构；砖粉良好的微集料填充作用和火山灰效应增强了界面过渡区的黏结性能和水化产物的纳观力学性能，从而改善UHPC的微观结构。 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,张梦圆,詹培敏,等.再生微粉对超高性能混凝土力学性能和微观结构的影响[J].混凝土与水泥制品,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.

利用电解锰渣制备活性粉末混凝土的研究

季军荣1，武双磊2，陈宇2，周洲1，陈胡星2

2021年第5期

摘要

引用本文

摘要：研究了电解锰渣取代石英粉或矿渣微粉对活性粉末混凝土（RPC）强度、收缩率和重金属浸出毒性的影响。结果表明：电解锰渣部分取代石英粉或矿渣微粉，RPC的抗压强度总体上有所提高，而抗折强度稍有下降；干缩率与湿胀率均降低；重金属浸出浓度均低于Ⅴ类地表水限值。 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.

季军荣,武双磊,陈宇,等.利用电解锰渣制备活性粉末混凝土的研究[J].混凝土与水泥制品,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.

不同材料增强处理再生骨料对混凝土抗压强度的影响

孙柯华1，沈阳2，王伟3，罗锋3，杨雅诗4，韦建斌5，章乐远3，冯兴国3，胡坤3，徐逸文3

2021年第5期

摘要

引用本文

摘要：研究了水泥浆、偏高岭土地聚物、掺粉煤灰偏高岭土地聚物、水泥浆-偏高岭土地聚物增强处理再生骨料对混凝土抗压强度的影响。结果表明：四种增强材料处理的再生骨料对混凝土抗压强度的影响顺序大小为水泥浆-偏高岭土地聚物＞偏高岭土地聚物＞水泥浆＞掺粉煤灰偏高岭土地聚物。 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.

孙柯华,沈阳,王伟,等.不同材料增强处理再生骨料对混凝土抗压强度的影响[J].混凝土与水泥制品,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.

原状粉煤灰-铁尾矿泡沫混凝土的性能研究

孙婧1,2,3，王宏1，陈静4，安艳玲1，兰建伟1，刘宏波1,3

2021年第5期

摘要

引用本文

摘要：采用Design-Expert软件研究了原状粉煤灰及铁尾矿砂对泡沫混凝土干密度、吸水率及抗压强度的影响，并观察了泡沫混凝土断面的细观结构。结果表明：原状粉煤灰掺量的增加会使泡沫混凝土的干密度和吸水率降低，当原状粉煤灰掺量占胶凝材料的40%时，泡沫混凝土的抗压强度最高；固定粉煤灰掺量为40%，铁尾矿砂掺量在0～50%范围内增加会使泡沫混凝土的干密度和抗压强度增加，吸水率降低；当原状粉煤灰掺量＜40%时，原状粉煤灰掺量越多，泡沫混凝土内部的气泡越稳定；铁尾矿砂掺量的增加可使泡沫混凝土的孔径减小，密实度增加。 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.

孙婧,王宏,陈静,等.原状粉煤灰-铁尾矿泡沫混凝土的性能研究[J].混凝土与水泥制品,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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