第二期_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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第二期

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.

表观密度与孔结构对微孔混凝土性能的影响

曹万智，高潇，代佳，王洪镇，杨永恒

2023年第2期

摘要

引用本文

摘要：采用料浆容重法进行配合比设计，分别制备了表观密度为600、800、1 000、1 200 kg/m3的微孔混凝土，并研究了表观密度与孔结构对微孔混凝土性能的影响。结果表明，所制备的微孔混凝土抗压强度在1.68~10.57 MPa之间，导热系数在0.081~0.140 W/（m·K）之间，吸水率在29.76%~48.16 %之间，且微孔混凝土的表观密度对上述性能的影响具有明显的规律性。孔结构测试结果表明，孔隙率、孔分布均匀性、平均孔径大小等因素对微孔混凝土性能也有一定的规律性影响。 Abstract: The slurry bulk density method was used to design the mix proportion, and the microporous concrete with apparent density of 600, 800, 1 000 and 1 200 kg/m3 was prepared, and the influence of apparent density and pore structure on the properties of microporous concrete was studied. The results show that the prepared microporous concrete compressive strength is 1.68~10.57 MPa, thermal conductivity is 0.081~0.140 W/(m·K), and the water absorption rate is between 29.76% and 48.16%. The influence of the apparent density of microporous concrete on the above properties has obvious regularity. The pore structure tests show that the influence of porosity, pore distribution uniformity, average pore size and other factors on the performance of microporous concrete also has a certain regularity.

曹万智,高潇,代佳,等.表观密度与孔结构对微孔混凝土性能的影响[J].混凝土与水泥制品,2023(2):60-64,72. CAO W Z,GAO X,DAI J,et al.Influence of Apparent Density and Pore Structure on Properties of Microporous Concrete[J].China Concrete and Cement Products,2023(2):60-64,72.

蒸压加气混凝土制造过程碳减排量评估模型研究与应用

王铁柱，张佳阳，赵炜璇，杨飞华

2023年第2期

摘要

引用本文

摘要：通过建立蒸压加气混凝土生产碳减排技术评估模型，提出了固废回收利用、绿色能源、余热利用等减碳技术措施。结果表明：采用减碳措施可有效降低蒸压加气混凝土生产阶段的碳排放，为实现蒸压加气混凝土“双碳”目标选择合理技术方向提供依据。 Abstract: Through the establishment of carbon emission reduction technology evaluation model for autoclaved aerated concrete production, carbon reduction technical measures such as solid waste recycling, green energy and waste heat utilization are put forward. The results show that carbon reduction measures can effectively reduce the carbon emissions in the production stage of autoclaved aerated concrete, and provide a basis for selecting a reasonable technical direction to achieve the "double carbon" goal of autoclaved aerated concrete.

王铁柱,张佳阳,赵炜璇,等.蒸压加气混凝土制造过程碳减排量评估模型研究与应用[J].混凝土与水泥制品,2023(2):65-67,72. WANG T Z,ZHANG J Y,ZHAO W X,et al.Research and Application of CO2 Emission Reduction Evaluation Model in Autoclaved Aerated Concrete Manufacturing Process[J].China Concrete and Cement Products,2023(2):65-67,72.

基于近场动力学方法的泡沫混凝土单轴拉伸三维数值模拟

饶烽瑞

2023年第2期

摘要

引用本文

摘要：采用近场动力学方法模拟了泡沫混凝土三维模型的单轴拉伸，通过与文献数据对比验证了数值模拟的有效性。基于对孔隙率为30%~70%、单元孔隙球度为0.6~1.0的泡沫混凝土三维模型的模拟结果，探讨了泡沫混凝土的孔隙结构对抗拉性能的影响。结果表明：泡沫混凝土的抗拉性能（弹性模量、强度和断裂能）随着孔隙率的增加而降低，随着单元孔隙球度的增加而提升。泡沫混凝土三维模型的抗拉性能具有显著的非均质性，这是由于孔隙随机分布导致不同模型的水泥骨架壁厚级配不同所致，在壁厚较薄的局部区域容易造成应力集中，从而削弱泡沫混凝土的抗拉性能。 Abstract: The peridynamics was used to simulate the uniaxial tension of the three-dimensional foamed concrete model, and the validity of the numerical simulation was verified by comparing with experimental datas. Based on the simulation results of the three-dimensional foamed concrete model with porosity of 30%~70% and single pore sphericity of 0.6~1.0, the influence of the pore structure of foamed concrete on its tensile properties was discussed. The results show that the tensile properties(elastic modulus, strength and fracture energy) decrease with the increase of porosity, and increase with the increase of single pore sphericity. The tensile properties of the three-dimensional foamed concrete model have significant heterogeneity, which is due to the random distribution of pores leading to different cement skeleton wall thickness gradations of different models. It is easy to cause stress concentration in local areas with thinner wall thickness, thus weakening the tensile properties of foamed concrete.

饶烽瑞.基于近场动力学方法的泡沫混凝土单轴拉伸三维数值模拟[J].混凝土与水泥制品,2023(2):68-72. RAO F R.Three-dimensional Numerical Simulation of Foamed Concrete Under Uniaxial Tension Based on Peridynamics[J].China Concrete and Cement Products,2023(2):68-72.

玄武岩纤维和外加剂对混凝土力学和抗裂性能的影响

夏艳晴1,2，种娜1，林燕1，钟文1，王宁1,2

2023年第2期

摘要

引用本文

摘要：研究了玄武岩纤维（BF）、可再分散乳胶粉、羟乙基甲基纤维素醚（HEMC）、UEA膨胀剂和十二烷基硫酸钠（K12）对混凝土力学性能和抗裂性能的影响。结果表明：随着可再分散乳胶粉掺量的增加，混凝土的抗压强度和劈裂抗拉强度基本呈降低趋势，拉压比先减小后增大；随着BF掺量的增加，混凝土的抗压强度和劈裂抗拉强度先增大后减小，拉压比基本呈增大趋势，抗裂性能提升；复掺BF、可再分散乳胶粉、HEMC、UEA膨胀剂和K12 时，混凝土的抗压强度和劈裂抗拉强度较复掺BF、可再分散乳胶粉、HEMC和UEA膨胀剂时有所降低，但拉压比增大，抗裂性能显著提升。 Abstract: The effects of basalt fiber(BF), redispersible latex powder, hydroxyethyl methyl cellulose ether (HEMC), UEA expansion agent and sodium dodecyl sulfate (K12) on the mechanical properties and crack resistance of concrete were studied. The results show that the compressive strength and splitting tensile strength of concrete basically decrease with the increase of redispersible latex powder content, and the tensile compression ratio decreases first and then increases. With the increase of BF content, the compressive strength and splitting tensile strength of concrete first increase and then decrease, the tension compression ratio basically increases, and the crack resistance is improved. When mixed with BF, redispersible latex powder, HEMC, UEA expansion agent and K12, the compressive strength and splitting tensile strength of concrete are lower than those of mixed with BF, redispersible latex powder, HEMC and UEA expansion agent, but the tensile compression ratio is increased, and the crack resistance is significantly improved.

夏艳晴,种娜,林燕,等.玄武岩纤维和外加剂对混凝土力学和抗裂性能的影响[J].混凝土与水泥制品,2023(2):51-54,59. XIA Y Q,CHONG N,LIN Y,et al.Effect of Basalt Fiber and Admixture on Mechanical Properties and Crack Resistance of Concrete[J].China Concrete and Cement Products,2023(2):51-54,59.

不同PVA纤维增强水泥基复合材料性能试验研究

刘军宏1，郑银林2,3，马锋玲2，刘艳霞2，王利娜2

2023年第2期

摘要

引用本文

摘要：对比研究了日本PVA纤维（J-PVA纤维）和国产PVA纤维（C-PVA、S-PVA纤维）对工程水泥基复合材料（ECC）性能影响的差异。结果表明：在纤维体积掺量为2.0%的条件下，掺J-PVA纤维的ECC能够完全实现多点开裂，应变硬化特征显著，28 d极限拉应变在3.7%以上；掺C-PVA纤维ECC的28 d极限拉应变在2.1%以上，增韧效果良好，且具有明显的价格优势，在实际工程应用中具有较强的竞争力；S-PVA纤维对ECC性能的改善效果不如J-PVA纤维和C-PVA纤维，工程应用中应注意优选甄别。 Abstract: The effects of Japanese PVA fiber(J-PVA fiber) and domestic PVA fiber(C-PVA、S-PVA fiber) on engineering cementitious composites(ECC) properties were compared. The results show that when the fiber volume fraction is 2.0%, the ECC mixed with J-PVA fiber can fully realize multi-point cracking, and the strain hardening characteristics are significant, and the 28 d ultimate tensile strain is above 3.7%. The 28 d ultimate tensile strain of ECC mixed with C-PVA fiber is more than 2.1%, which shows that the toughening effect is good, and it has obvious price advantage, and has strong competitiveness in practical engineering applications. The improvement effect of S-PVA fiber on ECC performance is not as good as that of J-PVA fiber and C-PVA fiber, and the attention should be paid to the selection and discrimination in engineering application.

刘军宏,郑银林,马锋玲,等.不同PVA纤维增强水泥基复合材料性能试验研究[J].混凝土与水泥制品,2023(2):55-59. LIU J H,ZHENG Y L,MA F L,et al.Experimental Study on Properties of Different PVA Fiber Reinforced Cementitious Composites[J].China Concrete and Cement Products,2023(2):55-59.

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