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

闪长玢岩的吸水特性及其对混凝土施工性能的影响研究

潘金敢1，王子龙1，柏立果1，程猛2，毛永琳2

2021年第10期

摘要

引用本文

摘要：测试了闪长玢岩的吸水特性，研究了闪长玢岩作为粗骨料对混凝土施工性能的影响。结果表明：闪长玢岩碎石内部的裂隙、孔隙较发达，吸水率高，但吸水速率慢；闪长玢岩的掺入使得混凝土拌合物的流动性损失显著增加，泌水率降低；采用骨料预湿工艺和掺减水剂的方法可以解决闪长玢岩混凝土的施工性能问题。 Abstract: The water absorption characteristics of diorite porphyrite was tested, and its influence on the construction performance of concrete was studied. The results show that the fissures and pores in the diorite porphyrite are relatively developed, and the water absorption is high, but the water absorption rate is slow. The addition of diorite porphyrite significantly increases the fluidity loss of concrete mixture and reduces the bleeding rate. The problem of construction performance of diorite porphyrite concrete can be solved by using aggregate pre-wetting technology and adding water reducing agent.

潘金敢,王子龙,柏立果,等.闪长玢岩的吸水特性及其对混凝土施工性能的影响研究[J].混凝土与水泥制品,2021(10):95-99. PAN J G,WANG Z L,BAI L G,et al.Study on Water Absorption Characteristics of Diorite Porphyrite and Its Influence on the Construction Performance of Concrete[J].China Concrete and Cement Products,2021(10):95-99.

纳米SiO2对掺膨胀剂碱矿渣砂浆力学及收缩性能的影响

田翔，陈佩圆，娄星，李进

2021年第10期

摘要

引用本文

摘要：研究了纳米SiO2掺量对掺膨胀剂碱矿渣砂浆抗压强度、自收缩、干燥收缩和孔隙率的影响。结果表明：膨胀剂的掺入有助于减少碱激发矿渣砂浆的自收缩和干燥收缩，但会显著降低早期强度；掺入2%纳米SiO2可基本补偿由于掺入膨胀剂造成的强度损失，且对碱矿渣砂浆自收缩和干燥收缩的影响较小；适量纳米SiO2的掺入可显著降低掺膨胀剂碱矿渣砂浆的孔隙率。 Abstract: The effects of nano-SiO2 content on the compressive strength, self-shrinkage, dry shrinkage and porosity of the alkali-activated slag mortar(AASM) with expansion agent were analyzed. The results show that the addition of expansive agent can reduce the self-shrinkage and dry shrinkage of AASM, but can significantly reduce its early strength. The addition of 2% nano-SiO2 can basically compensate the strength loss caused by the addition of expansive agent, and has little effect on the self-shrinkage and dry shrinkage of AASM. Appropriate amount of nano-SiO2 can significantly reduce the porosity of AASM with expansion agent.

田翔,陈佩圆,娄星,等.纳米SiO2对掺膨胀剂碱矿渣砂浆力学及收缩性能的影响[J].混凝土与水泥制品,2021(10):91-94. TIAN X,CHEN P Y,LOU X,et al.Effect of Nano-SiO2 on Mechanical and Shrinkage Properties of Alkali-activated Slag Mortar with Expansion Agent[J].China Concrete and Cement Products,2021(10):91-94.

废玻璃粉对高延性水泥基复合材料性能的影响

李碧雄，张治博，汪知文

2021年第10期

摘要

引用本文

摘要：采用粒径为75~300 μm的废玻璃粉取代部分河砂制备了高延性水泥基复合材料（HDCC），研究了废玻璃粉取代率(10%、20%、30%)对HDCC抗压、抗拉和抗弯性能以及流动性的影响。结果表明：废玻璃粉的掺入提高了HDCC的流动度；HDCC的抗压强度随废玻璃粉取代率的增加而增大；当废玻璃粉取代率为10%时，HDCC的拉伸性能略有改善，取代率继续增大时，抗拉性能劣化；随废玻璃粉取代率的增加，HDCC的弯曲韧性降低，裂缝数量减少，裂缝宽度增大。此外，拉伸过程中废玻璃粉对PVA纤维有刮伤，削弱了PVA纤维的拉伸性能，导致HDCC的抗拉强度和抗弯强度降低。 Abstract： High ductility cementitious composites (HDCC) were prepared by replacing part of river sand with waste glass powder with a particle size of 75~300 μm, and the effects of waste glass powder replacement rates(10%、20%、30%) on the compressive, tensile and flexural properties and fluidity of HDCC were studied. The results show that the fluidity of HDCC is improved by adding waste glass powder. The compressive strength of HDCC increases with the increase of waste glass powder replacement rate. When waste glass powder replacement rate is 10%, the tensile properties of HDCC are slightly improved, and the tensile properties are deteriorated when the replacement rate continues to increase. With the increase of waste glass powder replacement rate, the bending toughness of HDCC decreases, the number of cracks decreases and the width of cracks increases. In addition, the waste glass powder scratches PVA fiber during the tensile process, which weakens the tensile properties of PVA fiber, thus resulting in the decrease of tensile strength and bending strength of HDCC.

李碧雄,张治博,汪知文.废玻璃粉对高延性水泥基复合材料性能的影响[J].混凝土与水泥制品,2021(10):86-90,94. LI B X,ZHANG Z B,WANG Z W.Influence of Waste Glass Powder on the Properties of High Ductility Cementitious Composites[J].China Concrete and Cement Products,2021(10):86-90,94.

沥青搅拌站废粉对混凝土力学与耐久性能的影响研究

张兰峰1，王恒昌2，蓝亚明3，胡胜1，邓再桔1

2021年第10期

摘要

引用本文

张兰峰,王恒昌,蓝亚明,等.沥青搅拌站废粉对混凝土力学与耐久性能的影响研究[J].混凝土与水泥制品,2021(10):81-85. ZHANG Lan-feng, WANG Heng-chang, LAN Ya-ming,et al.Study on the Effect of Waste Powder From Asphalt Mixing Station on the Mechanical and Durability of Concrete[J].China Concrete and Cement Products,2021(10):81-85.

不锈钢管与钢纤维增强再生混凝土组合柱的轴压性能研究

黄波1，张亮2，翟江棚3

2021年第10期

摘要

引用本文

摘要：研究了不同再生骨料替代率下，不锈钢管与钢纤维增强再生混凝土组合柱的轴压性能，获得了试件的破坏形态、荷载-位移曲线和轴压刚度。结果表明：根据荷载-位移曲线的变化特征，可将试件按承载力稳定性分为不稳定和稳定两类；不稳定试件峰值荷载后的荷载-位移曲线快速探底，此后荷载开始缓慢提升，轴向变形快速增大；稳定试件峰值荷载后的荷载-位移曲线沿水平方向发展，试件的持荷能力突出；试件的轴压刚度在0.3~0.9倍的峰值荷载时达到最大，此时钢与混凝土的材料损伤相对较小，钢管对混凝土的约束效应相对有效；随着再生骨料替代率的增大，试件的轴压刚度逐渐降低；钢纤维抑制了裂缝的发展，维护了混凝土的整体性，从而提高了试件的轴压刚度。 Abstract： The axial compression performance of stainless steel pipe and steel fiber reinforced recycled concrete composite columns with different recycled aggregate replacement rates was studied, and the failure mode, load-displacement curve and axial compression stiffness were obtained. The results show that according to the characteristics of load-displacement curve, the specimens can be divided into unstable and stable types according to the bearing capacity stability. The load-displacement curve of the unstable specimen after the peak load quickly reaches the bottom, after which the load starts to increase slowly, and the axial deformation increases rapidly. The load-displacement curve of the stable specimen after the peak load develops in the horizontal direction, and the load-holding capacity of the specimen is outstanding. The axial compression stiffness of the specimen reaches the maximum when the load is 0.3~0.9 times of the peak load, and at this time, the material damage of steel and concrete is relatively small, and the restraint effect of steel pipe on concrete is relatively effective. With the increase of the replacement rate of recycled aggregate, the axial compression stiffness of the specimen decreases gradually. The steel fiber inhibits the development of cracks and maintains the integrity of the concrete, thereby improving the axial stiffness of the specimen.

黄波,张亮,翟江棚.不锈钢管与钢纤维增强再生混凝土组合柱的轴压性能研究[J].混凝土与水泥制品,2021(10):77-80. HUANG B,ZHANG L,ZHAI J P.Study on Axial Compression Performance of Stainless Steel Pipe and Steel Fiber Reinforced Recycled Concrete Composite Columns[J].China Concrete and Cement Products,2021(10):77-80.

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