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复合矿粉再生骨料CFG桩桩身材料强度试验研究
复合矿粉再生骨料CFG桩桩身材料强度试验研究
  • 陈 辉1,高 强2,陈 甦1,孙 飞2,钱林根1
2020年1期
摘要
引用本文
摘要:研究了复合矿粉(矿粉+粉煤灰)再生骨料CFG桩桩身材料强度随矿粉替代粉煤灰百分比和养护龄期的变化规律;通过正交试验设计,分析了复合矿粉再生骨料CFG桩桩身材料强度的影响因素,并对正交试验结果进行数值拟合,提出了强度预测公式。研究结果表明,复合矿粉再生骨料CFG桩桩身材料强度随矿粉替代粉煤灰百分比的增加而增加,但当矿粉替代粉煤灰百分比大于50%时,强度增长速率开始减小;复合矿粉再生骨料桩桩身材料强度随龄期增加而增大;影响复合矿粉CFG桩桩身材料强度的因素顺序依次为:龄期>矿粉取代粉煤灰>矿粉取代水泥,最优组合为矿粉取代粉煤灰100%、矿粉取代水泥0、龄期90 d;桩身材料强度预测公式精度较高。
Abstract: Through mixture ratio test of CFG pile with composite mineral powder (mineral powder + fly ash) recycled aggregate, the change rules of material strength under different replacement percentage of fly ash with mineral powder and various curing age were studied, and the influencing factors of material strength of CFG pile with composite mineral powder recycled aggregate was analyzed by orthogonal test, and the material strength prediction formula was proposed by mathematical fitting. The results show that the strength of composite mineral powder recycled aggregate pile increases with the increase of the percentage of fly ash replaced by mineral powder, but when the replacement percentage is greater than 50%, the growth rate of strength begins to decrease. The strength of composite mineral powder recycled aggregate pile increases with the increase of curing age. The importance ranking of factors affecting the strength of CFG pile material is: curing age > replacement percentage of fly ash with mineral powder > replacement percentage of cement with mineral powder, and the optimal combination is 100% fly ash replaced by mineral powder, 0% cement replaced by mineral powder, and 90 days curing age. The prediction formula of material strength has high accuracy
陈辉,高强,陈甦,等.复合矿粉再生骨料CFG桩桩身材料强度试验研究[J].混凝土与水泥制品,2020(1):97-100.
CHEN H,GAO Q,CHEN S,et al.Experimental Study on the Strength of Materials of Composite Mineral Powder Recycled Aggregate CFG Piles[J].China Concrete and Cement Products,2020(1):97-100.
铁尾矿砂混凝土与HRB500钢筋锚固性能试验研究
铁尾矿砂混凝土与HRB500钢筋锚固性能试验研究
  • 康洪震1,2,王 宇2,李 强1,3
2020年1期
摘要
引用本文
摘要:为研究HRB500高强钢筋在铁尾矿砂混凝土中的锚固性能,通过两类共27个不同锚固类型试件的直接拉拔试验方法,分析了不同锚固形式钢筋的受力特征,研究了铁尾矿砂混凝土强度、保护层厚度和锚固长度等因素对锚固性能的影响。结果表明,随着混凝土强度、保护层厚度和锚固长度的增加,锚固强度逐渐增大,且呈一定的线性关系,并在保护层厚度和锚固长度方面存在限值。同时,与GB 50010—2010《混凝土结构设计规范》中的锚固长度进行对比,提出了HRB500钢筋在铁尾矿砂混凝土中锚固长度设计建议。
Abstract: In order to study the anchorage performance of HRB500 high-strength steel bar in iron tailings sand concrete, the mechanical characteristics of different anchorage forms of steel bar were analyzed by direct pull-out test of 27 specimens of different anchorage types, and the effects of strength of iron tailings sand concrete, thickness of protective layer and anchorage length on anchorage performance were studied. The results show that with the increase of concrete strength, protective layer thickness and anchorage length, anchorage strength increases gradually and has a certain linear relationship, and there are limits in protective layer thickness and anchorage length. At the same time, compared with the anchorage length in GB 50010—2010 The Code Design of Concrete Structures, the design proposal of anchorage length of HRB500 steel bar in iron tailings sand concrete is put forward.
康洪震,王宇,李强.铁尾矿砂混凝土与HRB500钢筋锚固性能试验研究[J].混凝土与水泥制品,2020(1):92-96. KANG H Z,WANG Y,LI Q.Experimental Study on Anchorage Performance of Iron Tailings Sand Concrete and HRB500 Steel Bar[J].China Concrete and Cement Products,2020(1):92-96.
河道疏浚底泥制备泡沫混凝土试验研究
河道疏浚底泥制备泡沫混凝土试验研究
  • 杨小云1,赵 玲1,2;陈 兵3,仁 增1,张 颖2,李德平2,申哲民1
2020年1期
摘要
引用本文
摘要:利用河道疏浚底泥制备泡沫混凝土,研究了石灰、粉煤灰和微硅粉部分代替水泥,以及外掺偏硅酸钠、水玻璃和生物炭对所制备的底泥基泡沫混凝土抗压强度、导热系数和吸水耐水性能的影响。结果表明,微硅粉的加入优化了孔隙分布,可诱发火山灰反应,改善底泥基泡沫混凝土的综合性能;外掺2%的大麦草生物炭(500 ℃)可使底泥基泡沫混凝土的抗压强度提高14.2%,导热系数降低4.78%;添加石灰、粉煤灰和偏硅酸钠降低了泡沫混凝土的综合性能;水玻璃对泡沫混凝土的性能影响不大。
Abstract: Dredged sediment was used to produce foamed concrete, and the effects of partial replacement of cement by lime, fly ash and silica fume, and doping sodium metasilicate, water glass and biochar on the compressive strength, thermal conductivity and water absorption of the foamed concrete were studied. The results show that the addition of silica fume optimizes the pore distribution, induce the pozzolanic reaction, which can improve the comprehensive properties of the sediment foamed concrete. Dosage of 2% barley grass biochar (500 ℃) can increase the compressive strength of the sediment foamed concrete by 14.2% and reduce the thermal conductivity by 4.78%. The addition of lime, fly ash and sodium metasilicate reduce the comprehensive properties of foam concrete, and water glass has little effect on the properties of foam concrete.
杨小云,赵玲,陈兵,等.河道疏浚底泥制备泡沫混凝土试验研究[J].混凝土与水泥制品,2020(1):86-91.
YANG X Y,ZHAO L,CHEN B,et al.Experiment Study on Preparation of Foamed Concrete with Dredged River Sediment[J].China Concrete and Cement Products,2020(1):86-91.
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