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发布时间:2020-01-06 00:00:00
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等强度条件下碱激发高炉镍渣混凝土与普通硅酸盐水泥混凝土的性能对比
等强度条件下碱激发高炉镍渣混凝土与普通硅酸盐水泥混凝土的性能对比
  • 李彦贺1,贺茂军1,周能源1,杨 峻2,王登权2
2023年第5期
摘要
引用本文
摘   要:分别以NaOH和水玻璃为激发剂,制备了碱激发高炉镍渣混凝土,在碱激发高炉镍渣混凝土的7 d抗压强度与普通硅酸盐水泥混凝土的28 d抗压强度基本相等的条件下,对比了碱激发高炉镍渣混凝土和普通硅酸盐水泥混凝土的后期(90 d)力学性能、孔结构发展规律和抗氯离子渗透性能的差异。结果表明:碱激发高炉镍渣混凝土的早期(7 d前)强度发展迅速,其中,NaOH激发高炉镍渣混凝土28 d后的强度发展相对缓慢;等强度条件下,碱激发高炉镍渣混凝土的后期抗压强度和劈裂抗拉强度、孔结构和抗氯离子渗透性能均优于普通硅酸盐水泥混凝土,其中,水玻璃激发高炉镍渣混凝土的各项性能最好。 Abstract: Alkali-activated blast furnace nickel slag concrete was prepared using NaOH and water glass as activator. Under the condition that the 7 days compressive strength of alkali-activated blast furnace nickel slag concrete was basically equal to the 28 days compressive strength of ordinary Portland cement concrete, the differences in mechanical properties, pore structure development rules, and chloride ion penetration resistance between alkali-activated blast furnace nickel slag concrete and ordinary Portland cement concrete at the later stage (90 days) were compared. The results show that the early(before 7 days) strength of the alkali-activated blast furnace nickel slag concrete develops rapidly, and the strength of the NaOH activated blast furnace nickel slag concrete develops relatively slowly after 28 days. Under equal strength conditions, alkali-activated blast furnace nickel slag concrete has better compressive and splitting tensile strength, pore structure, and chloride ion penetration resistance than those of ordinary Portland cement concrete, among which water glass activated blast furnace nickel slag concrete has the best performance.
李彦贺,贺茂军,周能源,等.等强度条件下碱激发高炉镍渣混凝土与普通硅酸盐水泥混凝土的性能对比[J].混凝土与水泥制品,2023(5):79-82. LI Y H,HE M J,ZHOU N Y,et al.Performance Comparison of Alkali-Activated Blast Furnace Nickel Slag Concrete and Ordinary Portland Cement Concrete Under Equal Strength Conditions[J].China Concrete and Cement Product,2023(5):79-82.
锂渣粉和磷渣粉对再生混凝土力学及耐久性能的影响
锂渣粉和磷渣粉对再生混凝土力学及耐久性能的影响
  • 赵俭斌1,赵 港1,杜松岩1,李志军1,张延年1,王 震2
2023年第5期
摘要
引用本文
摘   要:研究了不同掺量的锂渣粉和磷渣粉分别单掺和复掺对再生混凝土抗压强度和抗氯离子渗透性能的影响。结果表明:与空白组试件相比,单掺锂渣粉或磷渣粉试件的7 d、14 d和28 d抗压强度变化幅度最高不超过7.7%;与锂渣粉和磷渣粉分别单掺相比,二者复掺对再生混凝土的7 d抗压强度影响不大,但明显提高了14 d、28 d抗压强度;单掺和复掺锂渣粉和磷渣粉试件的抗氯离子渗透性能均较空白组试件好,其中,复掺锂渣粉和磷渣粉试件的抗氯离子渗透性能介于单掺锂渣粉试件和单掺磷渣粉试件之间,单掺锂渣粉试件的抗氯离子渗透性能最好;再生混凝土中的氯离子在环境氯离子浓度较低时以物理吸附和化学结合为主,而在环境氯离子浓度较高时以化学结合为主;氯离子总结合能力随着环境氯离子浓度的增加而下降;复掺20%锂渣粉与10%磷渣粉试件的氯离子总结合能力相对最好。 Abstract: The effects of different amounts of lithium slag powder and phosphorus slag powder on the compressive strength and resistance to chloride ion penetration of recycled concrete were studied. The results show that, compared with the blank group, the compressive strength of the specimens mixed with lithium slag powder or phosphorus slag powder at 7 d, 14 d and 28 d has the highest change range of not more than 7.7%. Compared with single addition of lithium slag powder or phosphorus slag powder, their combination has little effect on the 7 d compressive strength of recycled concrete, but significantly improves the 14 d and 28 d compressive strength. The resistance to chloride ion penetration of the specimens with lithium slag powder and phosphorus slag powder is better than that of the blank group. Among them, the resistance to chloride ion penetration of the specimens mixed with lithium slag powder and phosphorus slag powder is between that of the specimens with single lithium slag powder or single phosphorus slag powder, and the resistance to chloride ion penetration of the specimens with single lithium slag powder is the best. The chloride ion in recycled concrete is mainly physical adsorption and chemical binding when the environmental chloride ion concentration is low, while the chloride ion is mainly chemical binding when the environmental chloride ion concentration is high. The total chloride ion binding capacity decreases with the increase of the environmental chloride ion concentration. The total chloride ion binding capacity of the specimen mixed with 20% lithium slag powder and 10% phosphorus slag powder is relatively best.
赵俭斌,赵港,杜松岩,等.锂渣粉和磷渣粉对再生混凝土力学及耐久性能的影响[J].混凝土与水泥制品,2023(5):83-87. ZHAO J B,ZHAO G,DU S Y,et al.Effect of Lithium Slag Powder and Phosphorus Slag Powder on Mechanical and Durability of Recycled Concrete[J].China Concrete and Cement Product,2023(5):83-87.
电炉钢渣用作混凝土骨料的研究进展
电炉钢渣用作混凝土骨料的研究进展
  • 韩 檬1,2,高成杰3,孙 健1,2,张亮亮1,2
2023年第5期
摘要
引用本文
韩檬,高成杰,孙健,等.电炉钢渣用作混凝土骨料的研究进展[J].混凝土与水泥制品,2023(5):88-94. HAN M,GAO C J,SUN J,et al.Research Progress of Electric Arc Furnace Slag as Concrete Aggregates[J].China Concrete and Cement Product,2023(5):88-94.
再生砂和再生粉对干粉砂浆工作性和力学性能的影响
再生砂和再生粉对干粉砂浆工作性和力学性能的影响
  • 凌 刚,徐智勇,胡 亮,林 希
2023年第5期
摘要
引用本文
摘   要:将废弃混凝土破碎、筛分制成再生砂和再生粉,研究了再生砂、再生粉分别等质量替代机制砂、石粉对干粉砂浆工作性和力学性能的影响,并对微观结构和水化产物进行了分析。结果表明:再生砂的掺入会增大砂浆的需水量、稠度损失和保水率,降低砂浆的表观密度;再生粉掺入过多会导致砂浆的需水量、表观密度和保水率降低,稠度损失增大;随着再生砂替代率的增加,砂浆的3 d抗压强度降低,28 d抗压强度先增大后减小,这主要归因于再生砂的内养护作用;再生粉对砂浆的3 d和28 d抗压强度影响不大,这主要归因于再生粉的水化作用和晶核效应;综合考虑砂浆的工作性和力学性能,建议再生砂替代率不超过40%,再生粉替代率不超过60%。 Abstract: The effects of recycled sand and recycled powder on the workability and mechanical properties of dry powder mortar were studied, and the microstructure and hydration products were analyzed. The results show that the addition of recycled sand can increase the water demand, consistency loss, and water retention rate of mortar, and reduce the apparent density of mortar. Excessive addition of recycled powder will reduce the water demand, apparent density, and water retention ratio of mortar, and increase the consistency loss. With the increase of the replacement rate of recycled sand, the compressive strength of mortar at 3 days decreases, and the compressive strength at 28 days first increases and then decreases, which is mainly due to the internal curing effect of recycled sand. The influence of recycled powder on the compressive strength of mortar at 3 days and 28 days is not significant, which is mainly due to the hydration and nucleation effects of recycled powder. Considering comprehensively the workability and mechanical properties of mortar, it is recommended that the replacement rate of recycled sand should not exceed 40%, and the replacement rate of recycled powder should not exceed 60%.
凌刚,徐智勇,胡亮,等.再生砂和再生粉对干粉砂浆工作性和力学性能的影响[J].混凝土与水泥制品,2023(5):95-98,102. LING G,XU Z Y,HU L,et al.Effect of Recycled Sand and Recycled Powder on Workability and Mechanical Properties of Dry Powder Mortar[J].China Concrete and Cement Product,2023(5):95-98,102.
大掺量石灰石粉对混凝土性能的影响
大掺量石灰石粉对混凝土性能的影响
  • 何 牟1,孟祥杰2
2023年第5期
摘要
引用本文
摘   要:研究了石灰石粉的掺量(0、12%、18%、24%、28%、32%)对混凝土工作性、力学性能和抗碳化性能的影响。结果表明:石灰石粉的掺入对混凝土的7 d抗压强度不利,但复掺适量粉煤灰和石灰石粉可提高混凝土的14 d、28 d和130 d抗压强度;混凝土的碳化深度随着碳化时间的增加而增大,复掺适量的粉煤灰和石灰石粉,同时适当延长养护龄期,可保证混凝土的抗碳化性能基本不变,甚至提高,建议石灰石粉的掺量不超过18%。 Abstract: The influence of limestone powder content (0, 12%, 18%, 24%, 28%, 32%) on the workability, mechanical properties and carbonation resistance of concrete was studied. The results show that the limestone powder is unfavorable to the compressive strength of concrete at 7 days, but adding proper content of fly ash and limestone powder can improve the compressive strength of concrete at 14 days, 28 days and 130 days. The carbonation depth of concrete increases with the increase of carbonation time. Adding proper content of fly ash and limestone powder and properly extending the curing time can ensure that the carbonation resistance of concrete is basically unchanged or even improved. It is recommended that the content of limestone powder should not exceed 18%.
何牟,孟祥杰.大掺量石灰石粉对混凝土性能的影响[J].混凝土与水泥制品,2023(5):99-102. HE M,MENG X J.Influence of Large Content of Limestone Powder on Performance of Concrete[J].China Concrete and Cement Product,2023(5):99-102.
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