節能與環保_2022_《混凝土與水泥制品》雜志社

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節能與環保

廢石粉對3D打印水泥砂漿性能的影響研究

邢家瑞，于淇，全世濤，黎玥琨，劉超，鄧智聰，張亞梅

2022年第1期

摘要

引用本文

摘 ? 要：研究了石材加工產生的廢石粉替代部分水泥對3D打印水泥砂漿性能的影響。結果表明：總體上，隨著廢石粉摻量的增加，砂漿的流動度降低，靜態屈服應力提高，但凝結時間變化不明顯；通過調整減水劑摻量可以改善廢石粉對3D打印水泥砂漿流動性和可建造性的不利影響；廢石粉的摻入對3D打印水泥砂漿的力學性能和層間界面黏結強度不利。 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,全世濤,等.廢石粉對3D打印水泥砂漿性能的影響研究[J].混凝土與水泥制品,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.

攪拌站廢水對混凝土抗凍性能與力學性能的影響研究

胡涌瓊

2022年第1期

摘要

引用本文

摘 ? 要：研究了攪拌站廢水摻量（25%、35%、45%）對混凝土凍融循環后的質量損失、外觀形態、動彈性模量及抗壓強度的影響規律，建立了摻廢水混凝土的凍融損傷模型。結果表明：當廢水摻量為25%時，試件的質量損失較大，但抗壓強度及動彈性模量仍高于普通混凝土；當廢水摻量為35%和45%時，混凝土的抗凍性能得到顯著提高，但廢水摻量為45%的混凝土動彈性模量下降較快，廢水摻量為35%的混凝土抗凍性能最佳；建立的凍融損傷模型能夠較好地反映摻廢水混凝土的凍融損傷演化規律。 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.

胡涌瓊.攪拌站廢水對混凝土抗凍性能與力學性能的影響研究[J].混凝土與水泥制品,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.

再生PET塑料骨料對砂漿單軸受壓性能的影響

陸俊1，鮑聰2，方劉基2，占海華3，梁超鋒2

2022年第1期

摘要

引用本文

摘 ? 要：利用廢棄PET塑料制備了再生PET塑料骨料（RPA），研究了RPA部分取代天然細骨料（0、10%、20%、30%、40%）對砂漿單軸受壓性能的影響，并建立了摻RPA砂漿的單軸受壓應力-應變本構關系。結果表明：隨著RPA取代率的增加，試件的延性增加，應力-應變曲線上升段和下降段斜率逐漸降低，峰值應力和彈性模量逐漸降低；試件的峰值應變、極限應變和抗壓韌性指數均隨著RPA取代率的增加而增大；建立的摻RPA砂漿單軸受壓本構方程計算結果與試驗結果吻合較好。 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.

陸俊,鮑聰,方劉基,等.再生PET塑料骨料對砂漿單軸受壓性能的影響[J].混凝土與水泥制品,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.

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