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

隧道洞渣机制砂的颗粒形貌参数对砂浆性能的影响

韩斌，赵爽，吴庆勇，王伟，曾鲁平，陈俊松

2023年第10期

摘要

引用本文

摘要：研究了隧道洞渣机制砂的细度模数（2.11~3.09）、石粉含量（3%~9%）、针片状颗粒的粒径（0.80~4.75 mm）与含量（0~20%）对机制砂空隙率和砂浆表观密度、流动度、抗压强度的影响。结果表明：随着细度模数的增加，机制砂的空隙率先减小后增大，砂浆的流动度、表观密度和28 d抗压强度先增大后减小，推荐细度模数为2.70；随着石粉含量的增加，机制砂的空隙率减小，砂浆的流动度、表观密度和28 d抗压强度降低，推荐石粉含量为3%；随着针片状颗粒粒径的增加，机制砂的空隙率增大，砂浆的流动度、表观密度和28 d抗压强度降低，推荐针片状颗粒粒径为0.80~1.60 mm；随着针片状颗粒含量从0增至20%，机制砂的空隙率增大，砂浆的流动度和表观密度降低，28 d抗压强度变化不大。 Abstract: The effects of fineness module(2.11~3.09), stone powder content(3%~9%) and particle size(0.80~4.75 mm) and content(0~20%) of needle flake particles of tunnel slag manufactured sand on the porosity of manufactured sand and the apparent density, fluidity and compressive strength of mortar were studied. The results show that as the fineness module increases, the porosity of manufactured sand first decreases and then increases, while the fluidity, apparent density and 28 d compressive strength of mortar first increase and then decrease, and the recommended fineness module is 2.70. With the increase of stone powder content, the porosity of manufactured sand decreases, and the fluidity, apparent density and 28 d compressive strength of mortar decrease, and the recommended stone powder content is 3%. As the particle size of needle flake particles increases, the porosity of manufactured sand increases, while the fluidity, apparent density and 28 d compressive strength of mortar decrease, and the recommended particle size of needle flake particles is 0.80~1.60 mm. As the content of needle flake particles increases from 0 to 20%, the porosity of manufactured sand increases, the fluidity and apparent density of mortar decrease, and there is little change in the 28 d compressive strength.

韩斌,赵爽,吴庆勇,等.隧道洞渣机制砂的颗粒形貌参数对砂浆性能的影响[J].混凝土与水泥制品,2023(10):72-77. HAN B,ZHAO S,WU Q Y,et al.The effect of particle morphology parameters of tunnel slag manufactured sand on performance of mortar[J].China Concrete and Cement Products,2023(10):72-77.

镍渣植生混凝土的制备及其性能研究

卞维宏1，纪小敏2，朱宝贵2

2023年第10期

摘要

引用本文

摘要：利用镍渣作为粗骨料制备了镍渣植生混凝土，研究了镍渣粒径、水灰比、骨灰比对镍渣植生混凝土抗压强度、孔隙率、透水系数和pH值的影响，分析了不同养护方式（自然养护、喷洒硫酸亚铁溶液并覆膜保湿养护）下，狗牙根和果岭草在镍渣植生混凝土中的生长情况。结果表明：随着水灰比的增加，试件的抗压强度先增大后减小，孔隙率和透水系数增大，pH值减小；随着镍渣粒径的减小，试件的抗压强度增大，孔隙率和透水系数减小，pH值基本不变；随着骨灰比的增大，试件的抗压强度减小，孔隙率和透水系数增大，pH值基本不变；与自然养护相比，喷洒硫酸亚铁溶液并覆膜保湿养护后，镍渣植生混凝土的碱度降低，狗牙根和果岭草的生长情况较好，其中，狗牙根的发芽情况和生长高度比果岭草更好。 Abstract: Nickel slag green-growing concrete was prepared by using nickel slag as coarse aggregates. The effects of nickel slag particle size, water-cement ratio, and aggregate-cement ratio on the compressive strength, porosity, permeability coefficient, and pH value of nickel slag green-growing concrete were studied. The growth of bermuda grass and green grass in nickel slag green-growing concrete was analyzed under different curing methods (natural curing, spraying ferrous sulfate solution and covering with film for moisture curing). The results show that as the water-cement ratio increases, the compressive strength of the specimen first increases and then decreases, the porosity and permeability coefficient increase, and the pH value decreases. As the particle size of nickel slag decreases, the compressive strength of the specimen increases, the porosity and permeability coefficient decrease, and the pH value remains basically unchanged. As the aggregate-cement ratio increases, the compressive strength of the specimen decreases, the porosity and permeability coefficient increase, and the pH value remains basically unchanged. Compared with natural curing, spraying ferrous sulfate solution and covering with film for moisture curing results in a decrease in alkalinity of nickel slag planting concrete, and better growth of bermuda grass and green grass. Among them, bermuda grass has better germination and growth height than those of green grass.

卞维宏,纪小敏,朱宝贵.镍渣植生混凝土的制备及其性能研究[J].混凝土与水泥制品,2023(10):78-81,86. BIAN W H,JI X M,ZHU B G.Study on preparation and performance of nickel slag green-growing concrete[J].China Concrete and Cement Products,2023(10):78-81,86.

锂渣基辅助胶凝材料的制备及其对混凝土性能的影响

肖波，张荣华*，胡卓强

2023年第10期

摘要

引用本文

摘要：制备了锂渣粉-钛矿渣粉、锂渣粉-花岗岩粉2种复合掺合料，测试了其活性和流动性，研究了其对混凝土工作性和力学性能的影响，确定了合适的m锂渣粉∶m钛矿渣粉、m锂渣粉∶m花岗岩粉。基于此，为了便于实际工程应用，制备了2种锂渣基辅助胶凝材料Z1、Z2。结果表明：综合考虑复合掺合料的活性、流动性及其对混凝土工作性和力学性能的影响，推荐m锂渣粉∶m钛矿渣粉、m锂渣粉∶m花岗岩粉均为6∶4；Z1、Z2分别满足相关标准中Ⅱ级、Ⅲ级复合掺合料的要求，且其等质量取代100%矿粉对混凝土的工作性和力学性能影响不大，同时能提高混凝土的耐久性能。 Abstract: Two composite admixtures (lithium slag powder-titanium slag powder and lithium slag powder-granite powder) were prepared, and their activity and flowability were tested, and the effects of the composite admixtures on the workability and mechanical properties of concrete were studied. Based on this, the suitable mlithium slag powder∶mtitanium slag powder and mlithium slag powder∶mgranite powder were determined. Two lithium slag based supplementary cementitious materials Z1 and Z2 were prepared for practical engineering applications. The results show that considering the activity, flowability of the composite admixture and its impact on the workability and mechanical properties of concrete, it is recommended that both mlithium slag powder∶mtitanium slag powder and mlithium slag powder∶mgranite powder be 6∶4. Z1 and Z2 meet the requirements of Class Ⅱ and Class Ⅲ composite admixtures in relevant standards respectively, and replacing 100% mineral powder with Z1 or Z2 has little impact on the workability and mechanical properties of concrete, and can improve the durability of concrete.

肖波,张荣华,胡卓强.锂渣基辅助胶凝材料的制备及其对混凝土性能的影响[J].混凝土与水泥制品,2023(10):82-86. XIAO B,ZHANG R H,HU Z Q.Preparation of lithium slag based supplementary cementitious materials and its impact on concrete performance[J].China Concrete and Cement Products,2023(10):82-86.

花岗岩锯泥对C80管桩混凝土性能的影响

李松1，胡新军1，梁寒琴1，万惠文2，沈聪2

2023年第10期

摘要

引用本文

摘要：将适量花岗岩锯泥分别与机制砂或河砂复配制成了混合砂，并等质量替代100%细骨料，研究了标准养护条件下花岗岩锯泥等质量替代100%粉煤灰对C30、C40混凝土工作性和力学性能的影响，对比分析了常压蒸汽养护和压蒸养护条件下，花岗岩锯泥等质量替代100%石英粉对C80管桩混凝土力学性能的影响，并进行了微观分析。结果表明：在标准养护条件下，花岗岩锯泥对C30、C40混凝土的坍落度和抗压强度影响较小；在常压蒸汽养护条件下，掺入花岗岩锯泥后，C80管桩混凝土的抗压强度变化不大，花岗岩锯泥呈惰性，主要起填充作用；与常压蒸汽养护条件相比，压蒸养护条件下C80管桩混凝土的抗压强度大幅提高，石英粉和花岗岩锯泥具有填充效应和一定的活性效应，其中的SiO2会与钙质材料发生水热合成反应，生成C-S-H（B）型水化硅酸钙和托贝莫来石。 Abstract: The suitable content of granite saw-mud was mixed with machine-made sand or river sand to produce mixed sand, and replacing all fine aggregates. The effects of replacing all fly ash with granite saw-mud under standard curing conditions on the workability and mechanical properties of C30 and C40 concrete were studied. The effects of replacing all quartz powder with granite saw-mud under atmospheric steam curing and autoclave curing conditions on the mechanical properties of C80 pipe pile concrete were compared and analyzed, and the microscopic analysis was conducted. The results show that under standard curing conditions, the impact of granite saw-mud on the slump and compressive strength of C30 and C40 concrete is relatively small. Under atmospheric steam curing conditions, the compressive strength of C80 pipe pile concrete show little change after adding granite saw-mud, and the granite saw-mud is in an inert state and mainly plays a filling role. Compared with atmospheric steam curing conditions, the compressive strength of C80 pipe pile concrete under autoclave curing conditions is significantly improved, and the quartz powder and granite saw-mud have filling and certain activity effects, and the SiO2 in them will undergo hydrothermal synthesis reaction with calcium materials to generate C-S-H(B) type hydrated calcium silicate and tobermorite.

李松,胡新军,梁寒琴,等.花岗岩锯泥对C80管桩混凝土性能的影响[J].混凝土与水泥制品,2023(10):87-89.94. LI S,HU X J,LIANG H Q,et al.Effect of granite saw-mud on performance of C80 pipe pile concrete[J].China Concrete and Cement Products,2023(10):87-89.94.

复合改性再生粗骨料对混凝土性能的影响

赖泽成

2023年第10期

摘要

引用本文

摘要：通过加热和颗粒整形对再生粗骨料进行了复合改性处理，对比分析了未改性和改性再生粗骨料的性能，研究了再生粗骨料的掺量对混凝土工作性和抗压强度的影响，优选出了最佳再生粗骨料类型和掺量，并在此基础上，研究了粉煤灰掺量对再生混凝土耐久性能的影响。结果表明：经过复合改性处理后，再生粗骨料的性能得到了强化。随着再生粗骨料掺量的增加，混凝土的坍落度、扩展度和抗压强度基本呈减小趋势；掺改性再生粗骨料混凝土（MRAC）的工作性和抗压强度整体上比掺未改性再生粗骨料混凝土（RAC）的好；综合考虑工作性和抗压强度，改性再生粗骨料的最佳掺量为30%；随着粉煤灰掺量的增加，MRAC的氯离子迁移系数和碳化深度均先减小后增大，推荐粉煤灰掺量为20%~30%。 Abstract: The composite modification treatment of recycled coarse aggregate was carried out through heating and particle shaping, and the performance of unmodified and modified recycled coarse aggregate was compared and analyzed. The influence of the content of recycled coarse aggregate on the workability and compressive strength of concrete was studied, and the optimal type and content of recycled coarse aggregate were selected. On this basis, the effect of fly ash content on the durability of recycled concrete was studied. The results show that the performance of recycled coarse aggregate has been strengthened after composite modification. With the increase of recycled coarse aggregate content, the slump, slump-flow and compressive strength of concrete show a decreasing trend generally. The workability and compressive strength of modified recycled coarse aggregate concrete(MRAC) are generally better than those of unmodified recycled coarse aggregate concrete(RAC). Considering workability and compressive strength comprehensively, the optimal content of modified recycled coarse aggregate is 30%. With the increase of fly ash content, the chloride ion migration coefficient and carbonization depth of MRAC first decrease and then increase, and the recommended fly ash content is 20%~30%.

赖泽成.复合改性再生粗骨料对混凝土性能的影响[J].混凝土与水泥制品,2023(10):90-94. LAI Z C.Effect of composite modified recycled coarse aggregates on performance of concrete[J].China Concrete and Cement Products,2023(10):90-94.

石材废浆的性能及其在薄层砂浆中的应用研究

陈洪钢1，詹镇峰2，彭鸿涛3

2023年第10期

摘要

引用本文

摘要：将石材（大理石、花岗岩）加工过程中产生的废浆经烘干、粉磨后得到石粉，测试了石粉的颗粒特性，研究了不同石粉掺量（0~30%）下，M5强度等级薄层砂浆的最低纤维素醚掺量，在此基础上，分析了石粉掺量对砂浆性能的影响。结果表明：大理石粉的矿物成分主要为方解石，花岗岩粉的矿物成分主要为石英、长石和云母；两种石粉的粒径分布范围主要在0～30 μm之间，其中，大理石粉整体上较细且均匀，而花岗岩粉中存在一定数量棱角明显的大颗粒；在砂浆保水率满足≥99%的条件下，石粉掺量越大，最低纤维素醚掺量越小；在最低纤维素醚掺量下，石粉掺量越大，砂浆的14 d黏结强度越小，掺大理石粉砂浆的28 d抗压强度越小，掺花岗岩粉砂浆的28 d抗压强度越大；掺入适量石粉降低了砂浆的28 d收缩率。 Abstract: The waste slurry generated during the stone(marble and granite) processing was dried and ground to obtain stone powder, and the particle characteristics of the stone powder were tested, and the minimum cellulose ether content of M5 strength grade thin layer mortar was studied under different stone powder contents (0~30%). Based on this, the influence of stone powder content on the mortar performance was analyzed. The results show that the mineral composition of marble powder is mainly calcite, while the mineral composition of granite powder is mainly quartz, feldspar and mica. The particle size distribution range of two types of stone powder mainly ranges from 0 to 30 μm, and marble powder is generally fine and uniform, while granite powder contains a certain number of large particles with obvious edges and corners. When the water retention rate of mortar is ≥99%, the higher the content of stone powder, the smaller the minimum content of cellulose ether. At the lowest content of cellulose ether, the higher the content of stone powder, the lower the 14 d bonding strength of the mortar, the lower the 28 d compressive strength of the mortar mixed with marble powder, and the higher the 28 d compressive strength of the mortar mixed with granite powder. Adding an appropriate content of stone powder reduces the 28 d shrinkage rate of the mortar.

陈洪钢,詹镇峰,彭鸿涛.石材废浆的性能及其在薄层砂浆中的应用研究[J].混凝土与水泥制品,2023(10):95-99. CHEN H G,ZHAN Z F,PENG H T.Study on properties of stone waste slurry and its application in thin layer mortar[J].China Concrete and Cement Products,2023(10):95-99.

电解锰渣对混凝土抗压强度及孔结构的影响

黄真江1，赵瑜1，侯俊宇2，张坤1，余冰洋1

2023年第10期

摘要

引用本文

摘要：研究了电解锰渣等质量替代0、10%、20%、30%、40%、50%水泥对混凝土抗压强度的影响，采用核磁共振技术分析了掺电解锰渣混凝土微观孔隙的发育规律。结果表明：掺入电解锰渣后，混凝土的抗压强度降低；随着龄期的延长，掺电解锰渣混凝土的抗压强度基本呈先小幅降低后增大的趋势；随着电解锰渣掺量的增加，T2谱图的面积增大，试件的孔隙率增大。 Abstract: The effects of replacing 0, 10%, 20%, 30%, 40% and 50% cement with electrolytic manganese slag on the compressive strength of concrete were studied, and the development law of micro pores in concrete mixed with electrolytic manganese slag was analyzed by using nuclear magnetic resonance technology. The results show that after adding electrolytic manganese slag, the compressive strength of concrete decreases. With the increase of age, the compressive strength of concrete mixed with electrolytic manganese slag shows a trend of initially decreasing slightly and then increasing. As the content of electrolytic manganese slag increases, the area of T2 spectrum increases, and the porosity of the specimen increases.

黄真江,赵瑜,张坤,等.电解锰渣对混凝土抗压强度及孔结构的影响[J].混凝土与水泥制品,2023(10):100-102. HUANG Z J,ZHAO Y,ZHANG K,et al.Effect of electrolytic manganese slag on compressive strength and pore structure of concrete[J].China Concrete and Cement Products,2023(10):100-102.

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