节能与环保_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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节能与环保

再生PET塑料骨料对砂浆单轴受压性能的影响

陆俊1，鲍聪2，方刘基2，占海华3，梁超锋2

2022年第1期

摘要

引用本文

摘要：利用废弃PET塑料制备了再生PET塑料骨料（RPA），研究了RPA部分取代天然细骨料（0、10%、20%、30%、40%）对砂浆单轴受压性能的影响，并建立了掺RPA砂浆的单轴受压应力-应变本构关系。结果表明：随着RPA取代率的增加，试件的延性增加，应力-应变曲线上升段和下降段斜率逐渐降低，峰值应力和弹性模量逐渐降低；试件的峰值应变、极限应变和抗压韧性指数均随着RPA取代率的增加而增大；建立的掺RPA砂浆单轴受压本构方程计算结果与试验结果吻合较好。 Abstract: Recycled PET plastic aggregate(RPA) was prepared from waste PET plastics. The effect of RPA partially replacing natural fine aggregate (0, 10%, 20%, 30%, 40%) on the uniaxial compressive properties of mortar was studied, and the uniaxial compressive stress-strain constitutive relationship of mortar mixed with RPA was established. The results show that with the increase of RPA replacement rate, the ductility of the specimen increases, the slopes of the rising and falling sections of the stress-strain curve gradually decrease, and the peak stress and elastic modulus gradually decrease. The peak strain, ultimate strain and compressive toughness index increase with the increase of RPA replacement rate. The established constitutive equation of the mortar mixed with RPA under uniaxial compression is in good agreement with the experimental results.

陆俊,鲍聪,方刘基,等.再生PET塑料骨料对砂浆单轴受压性能的影响[J].混凝土与水泥制品,2022(1):95-99. LU J,BAO C,FANG L J,et al.Effect of Recycled PET Plastic Aggregate on Uniaxial Compression Performance of Mortar[J].China Concrete and Cement Products,2022(1):95-99.

搅拌站废水对混凝土抗冻性能与力学性能的影响研究

胡涌琼

2022年第1期

摘要

引用本文

摘要：研究了搅拌站废水掺量（25%、35%、45%）对混凝土冻融循环后的质量损失、外观形态、动弹性模量及抗压强度的影响规律，建立了掺废水混凝土的冻融损伤模型。结果表明：当废水掺量为25%时，试件的质量损失较大，但抗压强度及动弹性模量仍高于普通混凝土；当废水掺量为35%和45%时，混凝土的抗冻性能得到显著提高，但废水掺量为45%的混凝土动弹性模量下降较快，废水掺量为35%的混凝土抗冻性能最佳；建立的冻融损伤模型能够较好地反映掺废水混凝土的冻融损伤演化规律。 Abstract: The effects of the content of wastewater from concrete mixing station(25%, 35%, 45%) on the mass loss, appearance, dynamic elastic modulus and compressive strength of concrete after freeze-thaw cycle were studied, and the freeze-thaw damage model of concrete mixed with wastewater was established. The results show that when the content of wastewater is 25%, the mass loss of the specimen is large, but the compressive strength and dynamic elastic modulus are still higher than those of ordinary concrete. When the wastewater content is 35% and 45%, the frost resistance of concrete is significantly improved, but the dynamic elastic modulus of concrete with wastewater content of 45% decreases rapidly, and the frost resistance of concrete with wastewater content of 35% is the best. The established freeze-thaw damage model can better reflect the freeze-thaw damage evolution law of concrete mixed with wastewater.

胡涌琼.搅拌站废水对混凝土抗冻性能与力学性能的影响研究[J].混凝土与水泥制品,2022(1):89-94. HU Y Q.Influence of Wastewater from Concrete Mixing Station on the Frost Resistance and Mechanical Properties of Concrete[J].China Concrete and Cement Products,2022(1):89-94.

废石粉对3D打印水泥砂浆性能的影响研究

邢家瑞，于淇，全世涛，黎玥琨，刘超，邓智聪，张亚梅

2022年第1期

摘要

引用本文

摘要：研究了石材加工产生的废石粉替代部分水泥对3D打印水泥砂浆性能的影响。结果表明：总体上，随着废石粉掺量的增加，砂浆的流动度降低，静态屈服应力提高，但凝结时间变化不明显；通过调整减水剂掺量可以改善废石粉对3D打印水泥砂浆流动性和可建造性的不利影响；废石粉的掺入对3D打印水泥砂浆的力学性能和层间界面黏结强度不利。 Abstract: The effect of replacing part of cement with waste stone powder produced by stone processing on the performance of 3D printing cement mortar was studied. The results show that with the increase of the waste stone powder content, the fluidity of cement mortar decreases and the static yield stress increases in general, but the setting time does not change significantly. The adverse effect of waste stone powder on the fluidity and constructability of 3D printing cement mortar can be improved by adjusting the amount of water reducing agent. The incorporation of waste stone powder is detrimental to the mechanical properties and interface bonding strength of 3D printing cement mortar.

邢家瑞,于淇,全世涛,等.废石粉对3D打印水泥砂浆性能的影响研究[J].混凝土与水泥制品,2022(1):84-88. XING J R,YU Q,QUAN S T,et al.Study on the Influence of Waste Stone Powder on Performance of 3D Printing Cement Mortar[J].China Concrete and Cement Products,2022(1):84-88.

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