节能降碳_2023_《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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节能降碳

纳米材料改性对再生粗骨料性能的影响研究

马书山1，张勇1，杨淑娟1，曾志勇2，杨飞3，李康3

2023年第2期

摘要

引用本文

摘要：研究了碳纳米管、纳米SiO2和纳米CaCO3的分散液浓度和浸泡时间对再生粗骨料吸水率、压碎值、堆积密度和表观密度的影响，并通过SEM分析了纳米材料的改性机理。结果表明：经纳米材料改性后，再生粗骨料的堆积密度、表观密度分别稳定在1 260 kg/m3、2 650 kg/m3左右，且能够显著提高再生混凝土的抗压强度；当碳纳米管浓度为0.20%、浸泡时间为24 h时，能使再生粗骨料的吸水率最大降低4.24%，压碎值最大降低18.75%；当纳米SiO2浓度为7%、浸泡时间为72 h时，能使再生粗骨料的吸水率最大降低15.70%，压碎值最大降低19.53%；当纳米CaCO3浓度为7%、浸泡时间为72 h时，能使再生粗骨料的吸水率最大降低9.62%，压碎值最大降低26.56%；SEM分析结果表明，经纳米材料改性后，再生粗骨料的表面变得均匀，内部结构变得更加密实。 Abstract: The effects of the dispersion concentration of carbon nanotubes, nano SiO2 and nano CaCO3 and the soaking time on the water absorption, crushing value, bulk density and apparent density of recycled coarse aggregate were studied, and the mechanism of nano materials modification was analyzed by SEM. The results show that the bulk density and apparent density of recycled coarse aggregate are stable at 1 260 kg/m3 and 2 650 kg/m3 respectively after nano materials modification, and the compressive strength of recycled concrete can be significantly improved. When the carbon nanotube concentration is 0.20% and the soaking time is 24 h, the water absorption of recycled coarse aggregate can be reduced by 4.24% at the maximum, and the crushing value can be reduced by 18.75% at the maximum. When the concentration of nano SiO2 is 7% and the soaking time is 72 h, the water absorption of recycled coarse aggregate can be reduced by 15.70% at the maximum, and the crushing value can be reduced by 19.53% at the maximum. When the concentration of nano CaCO3 is 7% and the soaking time is 72 h, the water absorption of recycled coarse aggregate can be reduced by 9.62% at the maximum, and the crushing value can be reduced by 26.56% at the maximum. SEM analysis results show that the surface of recycled coarse aggregate becomes uniform and the internal structure becomes more dense after nano materials modification.

马书山,张勇,杨淑娟,等.纳米材料改性对再生粗骨料性能的影响研究[J].混凝土与水泥制品,2023(2):73-78. MA S S,ZHANG Y,YANG S J,et al.Effect of Nano Materials Modification on Properties of Recycled Coarse Aggregates[J].China Concrete and Cement Products,2023(2):73-78.

磷渣的改性及其在混凝土中的应用研究

彭文彬，张荣华，崔贺龙

2023年第2期

摘要

引用本文

摘要：研究了单掺化学试剂（甲酸钙、碳酸钠、硫酸钠、石灰）、单掺固硫灰（10%、20%、30%）、复掺固硫灰与甲酸钙对磷渣性能的影响，在此基础上，制备了改性磷渣基辅助胶凝材料，并研究了其对混凝土工作性、力学性能和耐久性能的影响。结果表明：相比单掺其他化学试剂，单掺3%甲酸钙对磷渣水泥凝结时间的改善效果最好；单掺固硫灰时，随着固硫灰掺量的增加，磷渣水泥的凝结时间呈降低趋势；复掺固硫灰与甲酸钙时，综合考虑凝结时间、流动性、活性，复掺20%固硫灰与2%甲酸钙对磷渣的改性效果最好；制备的改性磷渣基辅助胶凝材料可替代常用辅助胶凝材料（矿粉、粉煤灰等）制备混凝土。 Abstract: The effects of single addition of chemical reagents (calcium formate, sodium carbonate, sodium sulfate, lime), single addition of circulating fluidized bed ash (10%, 20%, 30%), multiple addition of circulating fluidized bed ash and calcium formate on the properties of phosphorus slag were studied. On this basis, the modified phosphorus slag based auxiliary cementitious materials were prepared, and the effects of phosphorus slag based auxiliary cementitious materials on the workability, mechanical properties and durability of concrete were studied. The results show that the setting time of phosphorous slag cement is improved better by adding 3% calcium formate alone than by adding other chemical reagents alone. The setting time of phosphorous slag cement decreases with the increase of circulating fluidized bed ash content when the circulating fluidized bed ash is added only. When mixed with circulating fluidized bed ash and calcium formate, considering the setting time, fluidity and activity, mixing 20% circulating fluidized bed ash and 2% calcium formate has the best modification effect on phosphorus slag. The prepared modified phosphorus slag based auxiliary cementitious materials can replace the common auxiliary cementitious materials (mineral powder, fly ash, etc.) to prepare concrete.

彭文彬,张荣华,崔贺龙.磷渣的改性及其在混凝土中的应用研究[J].混凝土与水泥制品,2023(2):79-83. PENG W B,ZHANG R H,CUI H L.Study on Modification of Phosphorus Slag and Its Application in Concrete[J].China Concrete and Cement Products,2023(2):79-83.

多元复合掺合料对胶砂力学性能的影响

赵俭斌，徐禹佳，王亭，张延年

2023年第2期

摘要

引用本文

摘要：制备了铁尾矿-煤矸石二元复合掺合料和铁尾矿-粉煤灰-煤矸石三元复合掺合料，研究了复合掺合料的配比和替代率、活化剂的种类（NaOH、Ca(OH)2、Na2SiO3）和掺量对胶砂力学性能的影响，采用SEM观察了胶砂的微观结构。结果表明：对于二元复合掺合料，当铁尾矿粉与煤矸石粉的质量比为1∶1时，胶砂的28 d抗压、抗折强度达到最大，抗裂性能较好；对于三元复合掺合料，当铁尾矿粉、粉煤灰、煤矸石粉的质量比为4∶3∶1时，胶砂的28 d抗压强度最大，28 d抗折强度较高，抗裂性能较好；随着三元复合掺合料替代率的增加，胶砂的抗压、抗折强度基本呈降低趋势；活化剂NaOH对胶砂力学性能的改善效果较Ca(OH)2和Na2SiO3好，NaOH的最佳掺量为1.6%。 Abstract: The binary composite admixtures were prepared by using iron tailings and coal gangue, and the ternary composite admixtures were prepared by using iron tailings, fly ash and coal gangue. The effects of the mix proportion and replacement rate of the composite admixtures, the type and content of the activator(NaOH、Ca(OH)2、Na2SiO3) on the mechanical properties of cement mortar were studied, and the microstructure of cement mortar was observed by SEM. The results show that for binary composite admixtures, when the mass ratio of iron tailings powder and coal gangue powder is 1∶1, the 28 d compressive strength and flexural strength of cement mortar reach the maximum, and the crack resistance is good. For ternary composite admixtures, when the mass ratio of iron tailings powder, fly ash and coal gangue powder is 4∶3∶1, the 28 d compressive strength of cement mortar is the largest, the 28 d flexural strength is high, and the crack resistance is good. With the increase of the content of ternary composite admixtures, the compressive strength and flexural strength of cement mortar basically decrease. The improvement effect of the activator NaOH on mechanical properties of cement mortar is better than that of Ca(OH)2 and Na2SiO3, and the optimum content of NaOH is 1.6%.

赵俭斌,徐禹佳,王亭,等.多元复合掺合料对胶砂力学性能的影响[J].混凝土与水泥制品,2023(2):84-88,93. ZHAO J B,XU Y J,WANG T,et al.Effects of Multi Component Composite Admixture on Mechanical Properties of Cement Mortar[J].China Concrete and Cement Products,2023(2):84-88,93.

大理石粉对水泥基材料性能的影响研究

杨子园，籍凤秋，宋雅情，陈帅伟，陈子涵，范林海

2023年第2期

摘要

引用本文

摘要：研究了大理石粉的细度（13 μm、18 μm、38 μm）和掺量（0、5%、10%、15%、20%）对水泥基材料工作性、力学性能和碱活性的影响，采用XRD和SEM分析了水化产物和微观结构。结果表明：随着大理石粉掺量的增加，浆体的标准稠度用水量先增大后减小，流动度增大，且大理石粉的细度越大，标准稠度用水量和流动度越大；掺加适量（5%）的大理石粉可以有效提高水泥基材料的抗压、抗折强度，且大理石粉的细度越大，对抗压、抗折强度的提高效果相对越明显；大理石粉的细度越大，水泥基材料的28 d膨胀率越大；微观结果表明，大理石粉在水泥基材料中起到微集料填充作用，同时具有一定的活性。 Abstract: The fineness(13 μm, 18 μm, 38 μm) and content(0, 5%, 10%, 15%, 20%) of marble powder on the workability, mechanical properties and alkali activity of cement-based materials were studied. The hydration products and microstructure were analyzed by XRD and SEM. The results show that with the increase of the content of marble powder, the standard consistency water consumption of the paste basically increases first and then decreases, and the fluidity increases. The greater the marble powder, the greater the standard consistency water consumption and the fluidity. Adding appropriate content(5%) of marble powder can effectively improve the compressive strength and flexural strength of cement-based materials, and the greater the marble powder, the more obvious the improvement of compressive strength and flexural strength. The greater the marble powder, the greater the 28 d expansion rate of cement-based materials. The microscopic results show that marble powder plays a role of micro aggregate filling in cement-based materials and has certain activity.

杨子园,籍凤秋,宋雅情,等.大理石粉对水泥基材料性能的影响研究[J].混凝土与水泥制品,2023(2):89-93. YANG Z Y,JI F Q,SONG Y Q,et al.Study on Effect of Marble Powder on Properties of Cement-based Materials[J].China Concrete and Cement Products,2023(2):89-93.

建筑用砂石资源短缺现状及对策思考

崔军1，徐迅1，游潘丽2，纪梦琦1，聂艳妮1，王宗浩1，喻锐1，龙浩1

2023年第2期

摘要

引用本文

崔军,徐迅,游潘丽,等.建筑用砂石资源短缺现状及对策思考[J].混凝土与水泥制品,2023(2):94-97. CUI J,XU X,YOU P L,et al.Current Situation and Countermeasures of the Shortage of the Sand and Stone Resource for Construction[J].China Concrete and Cement Products,2023(2):94-97.

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