苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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节能与环保

再生骨料黏附砂浆含量对人工成孔透水混凝土抗冻性的影响
再生骨料黏附砂浆含量对人工成孔透水混凝土抗冻性的影响
  • 臧旭航1,朱平华1,王新杰1,陈春红1,刘 惠1,许 鸣2
2021年第1期
摘要
引用本文
摘   要:研究了不同冻融工况下黏附砂浆含量对高强再生透水混凝土抗冻耐久性的影响,并用SEM对其微观机理进行了分析。结果表明,300次冻融循环后,以相对动弹性模量不低于60%和抗压强度损失率不高于25%为失效准则,确定了再生粗骨料黏附砂浆的界限含量分别为41.19%和43.89%。在设计使用年限分别为100年、50年和30年的严寒地区高度饱水条件下,再生粗骨料最大黏附砂浆含量分别为33.00%、38.94%和40.27%。 Abstract: The influence of attached mortar content on the frost resistance of high strength recycled pervious concrete under different freeze-thaw conditions was studied, and the microscopic mechanism was analyzed by SEM. The results show that after 300 freezing-thawing cycles, taking the relative dynamic elastic modulus of not less than 60% and the loss rate of compressive strength not more than 25% as the failure criterion, the limit content of recycled coarse aggregate attached mortar is determined to be 41.19% and 43.89%, respectively. When the designed service life is 100 years, 50 years and 30 years respectively, the maximum attached mortar content of recycled coarse aggregate applied for structural concrete is 33.00%, 38.94% and 40.27%, respectively.
臧旭航,朱平华,王新杰,等.再生骨料黏附砂浆含量对人工成孔透水混凝土抗冻性的影响[J].混凝土与水泥制品,2021(1):80-84,99. ZANG X H,ZHU P H,WANG X J,et al.Effect of Recycled Aggregate Attached Mortar Content on Frost Resistance of Artificial Porous Pervious Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):80-84,99.
不同机制砂微观形貌和胶砂性能研究
不同机制砂微观形貌和胶砂性能研究
  • 孙星海1,刘 泽1,王军伟2,姜启衎1
2021年第1期
摘要
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摘   要:为更好研究机制砂的合理应用,选取了3种不同岩性的机制砂,通过分级筛分后调配成Ⅱ区中砂,设计了三种不同级配的机制砂。研究了不同机制砂的化学组成、矿物组成和微观形貌,以及不同机制砂对胶砂性能的影响。研究表明:不同机制砂颗粒的长径比和圆形度有一定的差异,个别粒级的参数差异较大;级配对钙基机制砂胶砂强度影响没有硅基机制砂显著;细度模数较大时,钙基机制砂胶砂强度大于硅基机制砂。 Abstract: In order to study the reasonable application of machine-made sands, 3 kinds of machine-made sands with different lithology were selected and mixed into the middle sands of Area Ⅱ through classification and screening, and three different gradations of machine-made sands were prepared. The influence on the properties of mortar of the chemical composition, mineral composition, and micro-morphology of machine-made sands, different machine-made sands were analyzed. The results indicate that the slenderness ratio and roundness of different machine-made sands are different, and the parameters of individual grades are also different. The effect of gradation on the strength of silicon-based sands is more significant than that of calcium-based sands. When the fineness modulus is larger, the strength of calcium-based machine-made sand is higher than that of silicon-based machine-made sand.
孙星海,刘泽,王军伟,等.不同机制砂微观形貌和胶砂性能研究[J].混凝土与水泥制品,2021(1):85-89. SUN X H,LIU Z,WANG J W,et al.Study on Microstructure and Mortar Properties of Different Machine-made Sands[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):85-89.
碱矿渣-粉煤灰砂浆的耐高温性能及孔结构研究
碱矿渣-粉煤灰砂浆的耐高温性能及孔结构研究
  • 高 帅1,吴岳峻2,唐海涛3,汪峻峰2,4,鲁刘磊3
2021年第1期
摘要
引用本文
摘   要:研究了不同粉煤灰掺量的碱矿渣-粉煤灰砂浆在20 ℃、200 ℃、400 ℃、600 ℃、800 ℃下力学性能的变化规律,并通过X射线衍射(XRD)、红外光谱(FTIR)和压汞法(MIP)分析了浆体的水化及孔结构。结果表明:掺粉煤灰可优化浆体的孔径分布,降低内部孔隙率,提高砂浆的耐高温性能,粉煤灰的适宜掺量为30%~50%;200 ℃时,掺30%粉煤灰砂浆的抗压强度最高,较20 ℃时提高了49.3%;600 ℃时,发生了固相反应,C-S-H凝胶减少,少害孔(20~50 nm)数量增加,砂浆保持了与20 ℃相当的抗压强度;800 ℃时,浆体生成大量钙黄长石,砂浆的抗压强度为20 ℃时的11.5%,基本失去工作性能。综合考虑,碱矿渣-粉煤灰砂浆的使用温度不宜超过600 ℃。 Abstract: The mechanical properties of alkali slag-fly ash mortar with different fly ash content at 20 ℃, 200 ℃, 400 ℃, 600 ℃, 800 ℃ were studied, and the hydration and pore structure were examined by using XRD, FTIR and MIP. The results show that adding fly ash can optimize the pore size distribution of the slurry, reduce the internal porosity, and improve the high-temperature resistance of the mortar, and the suitable blending amount is 30%~50%. At 200 ℃, the compressive strength of 30% fly ash mortar is the highest, which is 49.3% higher than that at 20 ℃. At 600 ℃, the mortar maintains the same compressive strength as 20 ℃, but the solid phase reaction occurs in the slurry, the number of less harmful pores (20~50 nm) increases and the C-S-H decreases. At 800 ℃, a large amount of calcium feldspar is formed in the slurry, and the compressive strength of the mortar is 11.5% of that at 20 ℃, which basically loses the working performance. Comprehensive consideration, the use temperature of alkali slag-fly ash mortar should not exceed 600 ℃.
高帅,吴岳峻,唐海涛,等.碱矿渣-粉煤灰砂浆的耐高温性能及孔结构研究[J].混凝土与水泥制品,2021(1):90-94. GAO S,WU Y J,TANG H T,et al. Study on High Temperature Resistance and Pore Structure of Alkali Slag-fly Ash Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):90-94.
蒸养机制砂混凝土的毛细吸水特性
蒸养机制砂混凝土的毛细吸水特性
  • 贡鑫茹1,2,3,李 东1,耿 健2,3
2021年第1期
摘要
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贡鑫茹,李东,耿健.蒸养机制砂混凝土的毛细吸水特性[J].混凝土与水泥制品,2021(1):95-99. GONG X R,LI D,GENG J.Water Absorption of Steam Curing Machine-made Sand Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):95-99.
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