节能降碳_2024_《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

固废基胶凝材料的粒度分布与其性能的关联度

张艳佳1，2，张广田1，2，*，于海洋1，2，贺光炜1，2

2024年第4期

摘要

引用本文

摘要：以矿渣、钢渣、脱硫石膏、粉煤灰为主要原材料制备了固废基胶凝材料，研究了粉磨时间（5、10、15 min）对固废基胶凝材料比表面积、粒度分布、标准稠度用水量和胶砂抗压强度的影响，并通过灰色关联分析方法探究了固废基胶凝材料的粒度分布与标准稠度用水量和抗压强度之间的关联度。结果表明：随着粉磨时间的增加，固废基胶凝材料的细度、比表面积、标准稠度用水量和胶砂抗压强度均增大；固废基胶凝材料的标准稠度用水量和胶砂的抗压强度均与粒度小于20 μm的颗粒含量呈正相关，与粒度大于等于20 μm的颗粒含量呈负相关；适当减少粒度10~20 μm的颗粒含量或增加粒度20~32 μm的颗粒含量，均可在一定程度上降低固废基胶凝材料的标准稠度用水量；增加粒度0~3 μm、10~20 μm的颗粒含量分别有助于提高胶砂的3 d、28 d抗压强度。 Abstract: Solid waste based cementitious materials were prepared by using slag, steel slag, desulfurization gypsum, and fly ash as the main raw materials. The effects of grinding time(5, 10, 15 min) on the specific surface area, particle size distribution, and water requirement of normal consistency of solid waste based cementitious materials, and compressive strength of the mortar were studied. The correlation degree between particle size distribution of solid waste based cementitious materials and water requirement of normal consistency, and compressive strength was explored through grey correlation analysis method. The results show that as the grinding time increases, the fineness, specific surface area, and water requirement of normal consistency of solid waste based cementitious materials, and compressive strength of the mortar all increase. The water requirement of normal consistency of solid waste based cementitious materials and the compressive strength of the mortar are positively correlated with the content of particles with particle size less than 20 μm, and negatively correlated with the content of particles with particle size greater than or equal to 20 μm. By appropriately reducing the content of particles with particle size of 10~20 μm or increasing the content of particles with particle size of 20~32 μm, the water requirement of normal consistency of solid waste based cementitious materials can be reduced to a certain extent. Increasing the content of particles with particle size of 0~3 μm and 10~20 μm respectively helps to improve the 3 d and 28 d compressive strength of the mortar.

张艳佳,张广田,于海洋,等.固废基胶凝材料的粒度分布与其性能的关联度[J].混凝土与水泥制品,2024(4):87-90,95. ZHANG Y J,ZHANG G T,YU H Y+,et al.Correlation degree between particle size distribution and performance of solid waste based cementitious materials[J].China Concrete and Cement Products,2024(4):87-90,95.

主塔C60大体积混凝土配合比设计及性能研究

盖珂瑜1，2，龙勇1，2，蒋本俊1，3，王宇1，2，周毅1，2，李晨1，2

2024年第4期

摘要

引用本文

摘要：研究了粉煤灰单掺、粉煤灰与矿渣粉或降黏剂复掺对主塔C60大体积混凝土工作性、力学性能、绝热温升和收缩性能的影响。结果表明：掺入适量降黏剂提高了混凝土的流动性，而掺入矿渣粉降低了混凝土的流动性，但仍满足施工要求；与单掺粉煤灰的试验组相比，复掺适量降黏剂提高了混凝土的抗压强度和弹性模量，降低了绝热温升和自收缩，对劈裂抗拉强度和干燥收缩的影响较小，而复掺适量矿渣粉后，混凝土的7 d抗压强度略有降低，28 d、60 d抗压强度增大，弹性模量增大，绝热温升和干燥收缩降低，28 d劈裂抗拉强度和自收缩变化不大。 Abstract: The effects of single addition of fly ash, compound addition of fly ash and slag powder or viscosity reducer on the workability, mechanical properties, adiabatic temperature rise, and shrinkage performance of C60 mass concrete for main tower were studied. The results show that adding an appropriate content of viscosity reducer improves the flowability of concrete, while adding slag powder reduces the flowability of concrete, but still meets the construction requirements. Compared with the experimental group with a single addition of fly ash, adding an appropriate content of viscosity reducer increases the compressive strength and elastic modulus of concrete, reduces adiabatic temperature rise and self shrinkage, and has a smaller impact on splitting tensile strength and dry shrinkage. However, after adding an appropriate content of slag powder, the 7 d compressive strength of concrete slightly decreases, while the 28 d and 60 d compressive strength increase, the elastic modulus increases, the adiabatic temperature rise and dry shrinkage decrease, and the 28 d splitting tensile strength and self shrinkage do not show significant changes.

盖珂瑜,龙勇,蒋本俊,等.主塔C60大体积混凝土配合比设计及性能研究[J].混凝土与水泥制品,2024(4):91-95. GE K Y,LONG Y,JIANG B J,et al.Mix proportion design and performance study of C60 mass concrete for main tower[J].China Concrete and Cement Products,2024(4):91-95.

超细粉煤灰特性及其在混凝土中的应用研究

王玉斌1，尹韶宁2，潘栋2，李梓源1，王娜1，3，袁鹏2

2024年第4期

摘要

引用本文

摘要：制备了不同细度（674、810、1 126 m2/kg）的超细粉煤灰，研究了其掺量（0~25%）对水泥-超细粉煤灰胶凝材料性能的影响，分析了掺不同细度超细粉煤灰混凝土的工作性、力学性能和耐久性能。结果表明：超细粉煤灰的强度活性指数和需水量比均随着其细度的增加而增大；用0~25%的超细粉煤灰替代P·O 42.5级水泥后，胶凝材料的初凝、终凝时间分别延长了11~71 min、13~74 min；与未掺超细粉煤灰的混凝土相比，掺超细粉煤灰混凝土的坍落度提高，3 d和7 d抗压强度相差不大，28、56、90 d抗压强度均有所提高，抗碳化性能和抗硫酸盐侵蚀性能均有所提升。 Abstract: Ultrafine fly ash with different fineness (674, 810, 1 126 m2/kg) was prepared, and the effects of its content (0~25%) on the properties of cement-ultrafine fly ash cementitious materials was studied. The workability, mechanical properties, and durability of concrete with different fineness ultrafine fly ash were analyzed. The results show that the strength activity index and water demand ratio of ultrafine fly ash increase with the increase of the fineness. After replacing P·O 42.5 cement with 0~25% content of ultrafine fly ash, the initial setting time and final setting time of the cementitious materials are extended by 11~71 min and 13~74 min, respectively. Compared with the concrete without ultrafine fly ash, the slump of concrete with ultrafine fly ash is increased, the 3 d and 28 d compressive strength are not significantly different, the 28 d, 56 d, and 90 d compressive strength are increased, and the carbonation resistance and sulfate corrosion resistance are improved.

王玉斌,尹韶宁,潘栋,等.超细粉煤灰特性及其在混凝土中的应用研究[J].混凝土与水泥制品,2024(4):96-100. WANG Y B,YIN S N,PAN D,et al.Study on characteristics of ultrafine fly ash and its application in concrete[J].China Concrete and Cement Products,2024(4):96-100.

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