节能降碳_2022_《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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节能降碳

建筑垃圾再生骨料改性技术研究进展

王亚松1，覃铃玲1，李松2，谢颉3，段平1

2022年第9期

摘要

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摘要：合理使用再生骨料有助于节约资源和改善环境，但再生骨料存在形状不规则、吸水率高、压碎指标大等问题，直接用到混凝土中会劣化混凝土的性能。对再生骨料进行改性可在一定程度上减小其与天然骨料之间的差距，从而减轻其对混凝土性能的不利影响。通过物理强化技术、化学强化技术和微生物矿化技术改性再生骨料的作用机理和改性效果介绍，为再生骨料在混凝土中的合理应用提供借鉴。 Abstract: The rational use of recycled aggregates can help save resources and improve the environment. However, recycled aggregates have problems such as irregular shape, high water absorption, and large crushing index. Direct use of recycled aggregates in concrete will deteriorate the performance of concrete. The modification of recycled aggregates can reduce the gap between recycled aggregates and natural aggregates to some extent, so as to reduce its adverse impact on the performance of concrete. The action mechanism and modification effect of modified recycled aggregates by physical strengthening technology, chemical strengthening technology and microbial mineralization technology are introduced, which can provide a reference for rational application of recycled aggregates in concrete.

王亚松,覃铃玲,李松,等.建筑垃圾再生骨料改性技术研究进展[J].混凝土与水泥制品,2022(9):99-105. WANG Y S,QIN L L,LI S,et al.Research Progress on Modification Technology of Construction Waste Recycled Aggregates[J].China Concrete and Cement Products,2022(9):99-105.

碱激发矿粉-粉煤灰混凝土耐久性能试验研究

任君1，王允波2，徐伟伟2，张思雨2，王玉璞2，王腾2

2022年第9期

摘要

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摘要：研究了激发剂模数、养护方式和粉煤灰掺量对机制砂碱激发混凝土（MAAC）耐久性能的影响。结果表明：与20 ℃标养相比，60 ℃蒸养MAAC的收缩率降低明显，耐久性能增强；掺入20%粉煤灰后，MAAC的收缩性能有所改善，抗硫酸盐侵蚀性能有所减弱，但在蒸养条件下，掺入20%粉煤灰可以在一定程度上提高MAAC的抗氯离子侵蚀能力；随着碱激发剂模数由2.0降至1.8，MAAC的耐久性能有所增强。 Abstract: The effects of activator modulus, curing method and fly ash content on the durability of manufactured sand alkali-activated concrete(MAAC) were studied. The results show that compared with the standard curing at 20 ℃, the shrinkage rate of MAAC in steam curing at 60 ℃ is significantly reduced, and the durability is enhanced. After adding 20% fly ash, the shrinkage performance of MAAC is improved, the resistance to sulfate corrosion is weakened, but under steam curing conditions, adding 20% fly ash can improve the chloride ion corrosion resistance of MAAC to a certain extent. The durability of MAAC is enhanced with the decrease of alkali activator modulus from 2.0 to 1.8.

任君,王允波,徐伟伟,等.碱激发矿粉-粉煤灰混凝土耐久性能试验研究[J].混凝土与水泥制品,2022(9):95-98. REN J,WANG Y B,XU W W,et al.Experimental Study on Durability of Alkali-activated Mineral Powder and Fly Ash Concrete[J].China Concrete and Cement Products,2022(9):95-98.

混合再生细骨料水泥砂浆性能试验研究

马加存1，杨永富2，段淑芸1，张晓萌2，迟朝明3，葛智4，庄培芝4

2022年第9期

摘要

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摘要：研究了废弃混凝土和废弃黏土砖制成的混合再生细骨料的掺量（0、30%、60%、100%）和预湿时长（0、1/6 h、24 h）对砂浆流动性、抗压强度、抗折强度和干燥收缩性能的影响。结果表明：砂浆的初始流动度和流动度经时损失率随着再生细骨料掺量和预湿时长的增加而降低；随着再生细骨料掺量的增加，砂浆的抗压强度降低，抗折强度变化较小；砂浆的抗压、抗折强度随着再生细骨料预湿时长的增加呈增大趋势；由于再生细骨料的内养护作用，砂浆的干燥收缩量随再生细骨料掺量和预湿时长的增加呈减小趋势。 Abstract: The effects of the content (0, 30%, 60%, 100%) and pre-wetting time (0, 1/6 h, 24 h) of mixed recycled fine aggregate made from waste concrete and waste clay bricks on the fluidity, compressive strength, flexural strength and drying shrinkage properties of mortar were studied. The results show that the initial fluidity and fluidity loss rate of mortar decrease with the increase of recycled fine aggregate content and pre-wetting time. With the increase of recycled fine aggregate content, the compressive strength of mortar decreases, and the change of flexural strength is small. The compressive and flexural strengths of mortar tend to increase with the increase of pre-wetting time of recycled fine aggregate. Due to the internal curing effect of recycled fine aggregate, the drying shrinkage of mortar decreases with the increase of recycled fine aggregate content and pre-wetting time.

马加存,杨永富,段淑芸,等.混合再生细骨料水泥砂浆性能试验研究[J].混凝土与水泥制品,2022(9):92-94,105. MA J C,YANG Y F,DUAN S Y,et al.Experimental Study on the Properties of Mixed Recycled Fine Aggregate Mortar[J].China Concrete and Cement Products,2022(9):92-94,105.

橡胶混凝土力学性能与耐久性能研究进展

郑邦容1，唐延丰2，李佳骏2，范灿俊2，张敏2

2022年第9期

摘要

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摘要：介绍了国内外有关橡胶混凝土力学性能与耐久性能的研究进展，得出了掺入橡胶颗粒后混凝土的力学性能降低，而耐久性能改善的结论，提出了橡胶混凝土的未来研究方向。 Abstract: The research progress on the mechanical properties and durability of rubber concrete at home and abroad is introduced, and the conclusion that the mechanical properties of concrete are reduced after adding rubber particles, but the durability is improved is drawn, and the future research direction of rubber concrete is proposed.

郑邦容,唐延丰,李佳骏,等.橡胶混凝土力学性能与耐久性能研究进展[J].混凝土与水泥制品,2022(9):88-91. ZHENG B R,TANG Y F,LI J J,et al.Research Progress on Mechanical Properties and Durability of Rubber Concrete[J].China Concrete and Cement Products,2022(9):88-91.

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