第十期_2022_《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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第十期

黏土基铸造废旧砂特性及其对砂浆性能的影响

许晓烨1，李丹妮1，温小栋1，冯蕾1，盛惠佳2，许琳3

2022年第10期

摘要

引用本文

摘要：分析了黏土基铸造废旧砂的特性，研究了黏土基铸造废旧砂对砂浆性能的影响。结果表明：黏土基铸造废旧砂中含有微量重金属，但在相关环境标准许可范围内；与河砂相比，黏土基铸造废旧砂的颗粒形貌不规则、细颗粒较多；黏土基铸造废旧砂的表观密度与河砂接近，但堆积密度显著低于河砂，吸水率、亚甲蓝值和氯离子含量显著大于河砂；该黏土基铸造废旧砂的细度模数为1.76，属于Ⅲ区砂；当黏土基铸造废旧砂的替代率小于20%时，对砂浆的流动度和减水剂用量影响不大；当黏土基铸造废旧砂的替代率为40%时，砂浆的强度达到最高。 Abstract: The characteristics of clay-based foundry waste sand were analyzed, and the influence of clay-based foundry waste sand on the properties of cement mortar was studied. The results show that the clay-based foundry waste sand contains trace heavy metals, but it is within the allowable range of relevant environmental standards. Compared with river sand, the clay-based foundry waste sand has irregular particle morphology and more fine particles. The apparent density of the clay-based foundry waste sand is close to that of river sand, but the bulk density is significantly lower than that of river sand, and the water absorption, methylene blue value and chloride ion content are significantly higher than those of river sand. The fineness modulus of the clay-based foundry waste sand is 1.76, which belongs to the zone Ⅲ sand. When the replacement rate of clay-based foundry waste sand is less than 20%, it has little effect on the fluidity and the water reducing agent amount of the cement mortar. When the replacement rate of the clay-based foundry waste sand is 40%, the strength of the cement mortar is the highest.

许晓烨,李丹妮,温小栋,等.黏土基铸造废旧砂特性及其对砂浆性能的影响[J].混凝土与水泥制品,2022(10):101-104. XU X Y,LI D N,WEN X D,et al.Characteristics of Clay-based Foundry Waste Sand and Its Influence on Properties of Cement Mortar[J].China Concrete and Cement Products,2022(10):101-104.

花岗岩废石粉对水泥砂浆性能的影响

谭幸淼1，吴汐晗1，杨健茹1，赵建明2，曾昊1，梁超锋1，3

2022年第10期

摘要

引用本文

摘要：研究了花岗岩废石粉等质量（0、10%、20%、30%）取代水泥对砂浆抗压强度、毛细吸水、干燥收缩及微观结构的影响，并分析了其作用机理。结果表明：总体上，随着花岗岩废石粉取代率的增加，砂浆的抗压强度下降，毛细吸水量和干缩率增大，孔结构劣化；但当花岗岩废石粉取代率为10%时，砂浆的28 d抗压强度略高于基准组，干缩率和累计孔隙体积低于基准组，孔结构与基准组相近。 Abstract: The effects of granite waste powder replacing cement(0、10%、20%、30%) on the compressive strength, capillary water absorption, drying shrinkage and microstructure of mortar were studied, and its mechanism was analyzed. The results show that with the increase of granite waste powder replacement rate, the compressive strength of mortar decreases, the capillary water absorption and drying shrinkage rate increase, the pore structure deteriorates. However, when granite waste powder replacement rate is 10%, the 28 d compressive strength of mortar is slightly higher than that of the reference group, the drying shrinkage rate and cumulative pore volume are lower than those of the reference group, and the pore structure is similar to that of the reference group.

谭幸淼,吴汐晗,杨健茹,等.花岗岩废石粉对水泥砂浆性能的影响[J].混凝土与水泥制品,2022(10):96-100. TAN X M,WU X H,YANG J R,et al.Effects of Granite Waste Powder on the Performance of Cement Mortar[J].China Concrete and Cement Products,2022(10):96-100.

蔗渣灰对砂浆性能及孔结构的影响研究

李腾宇a，梁晋鹏a，陀广泉a，韦远富a，陈正a，b，李舒阳a，韦京利a

2022年第10期

摘要

引用本文

摘要：研究了蔗渣灰等质量替代水泥对砂浆力学性能、抗氯离子渗透性能和抗碳化性能的影响，分析了蔗渣灰对砂浆孔结构的影响机理。结果表明：随着蔗渣灰掺量的增加，砂浆的抗压、抗折强度均呈先增大后减小的趋势，抗氯离子渗透性能和抗碳化性能也呈相似的变化规律；蔗渣灰的最佳掺量为15%，此时，试件的抗压强度较对照组提高了9.8%，氯离子扩散系数减小了26.2%，碳化深度降低了3.8%；掺入适量蔗渣灰可有效降低砂浆基体的孔隙率，减少多害孔，优化孔结构，提高密实性。 Abstract：The effects of replacing cement with bagasse ash on the mechanical properties, chloride ion penetration resistance and carbonization resistance of mortar were studied, and the influence mechanism of bagasse ash on the pore structure of mortar was analyzed. The results show that with the increase of bagasse ash content, the compressive strength and flexural strength of mortar increase first and then decrease, and the chloride ion penetration resistance and carbonization resistance also show a similar change law. The optimum content of bagasse ash is 15%, at this time, the compressive strength of the specimen is increased by 9.8% compared with the control group, the chloride ion diffusion coefficient is decreased by 26.2%, and the carbonization depth is decreased by 3.8%. Adding appropriate amount of bagasse ash can effectively reduce the porosity of mortar matrix, reduce the harmful pores, optimize the pore structure and improve the compactness.

李腾宇,梁晋鹏,陀广泉,等.蔗渣灰对砂浆性能及孔结构的影响研究[J].混凝土与水泥制品,2022(10):92-95,100. LI T Y,LIANG J P,TUO G Q,et al.Effect of Bagasse Ash on Properties and Pore Structure of Mortar[J].China Concrete and Cement Products,2022(10):92-95,100.

再生砂作为内养护材料对C60混凝土性能的影响

童小根，张凯峰，罗作球，孟刚，胡宇博，张林啸，王敏

2022年第10期

摘要

引用本文

摘要：研究了再生砂等质量（0、30%、40%、50%、60%、70%）替代天然砂对C60混凝土力学性能、耐久性能、收缩性能和抗裂性能的影响，并采用XRD分析了再生砂的作用机理。结果表明：掺入30%~50%的再生砂对混凝土的抗压、劈裂抗拉强度影响不大，但能有效提高混凝土的抗氯离子渗透性能和抗硫酸盐侵蚀性能，改善混凝土的收缩性能和开裂性能。 Abstract: The influence of recycled sand replacing 0, 30%, 40%, 50%, 60%, 70% natural sand on the mechanical properties, durability, shrinkage and crack resistance of C60 concrete was studied, and the mechanism of recycled sand was analyzed by XRD. The results show that the addition of 30%~50% recycled sand has little effect on the compressive strength and splitting tensile strength of concrete, but can effectively improve the chloride ion penetration resistance and sulfate corrosion resistance of concrete, and improve the shrinkage and crack resistance of concrete.

童小根,张凯峰,罗作球,等.再生砂作为内养护材料对C60混凝土性能的影响[J].混凝土与水泥制品,2022(10):88-91. TONG X G,ZHANG K F,LUO Z Q,et al.Effect of Recycled Sand as Internal Curing Material on Properties of C60 Concrete[J].China Concrete and Cement Products,2022(10):88-91.

粉煤灰漂珠对碱矿渣水泥灌浆料性能的影响

陈晓磊1，田义2，魏奇科1，刘赫凯1，刘建1，胡星3，余林文2

2022年第10期

摘要

引用本文

摘要：研究了水胶比、碱当量和粉煤灰漂珠掺量对碱矿渣水泥灌浆料流动度和抗压强度的影响。结果表明：随着水胶比的增加，碱矿渣水泥灌浆料的流动度增大；随着碱当量的增加，碱矿渣水泥灌浆料的流动度和抗压强度均呈先增后减的趋势；粉煤灰漂珠能有效改善碱矿渣水泥灌浆料的流动度，且掺入适量的粉煤灰漂珠，对碱矿渣水泥灌浆料的抗压强度影响不大。总体而言，当水胶比为0.4、砂胶比为1.5、水玻璃模数为1.4、碱当量为8%、粉煤灰漂珠掺量为10%时，碱矿渣水泥灌浆料的各项性能较好，满足相关标准要求。 Abstract: The influence of water-binder ratio, alkali equivalent and fly ash microsphere content on the fluidity and compressive strength of alkali-activated slag cement grouting material was studied. The results show that with the increase of water-binder ratio, the fluidity of alkali-activated slag cement grouting material increases. With the increase of alkali equivalent, the fluidity and compressive strength of the alkali-activated slag cement grouting material increase first and then decrease. The fly ash microsphere can improve the fluidity of alkali-activated slag cement grouting material, and the proper content of fly ash microsphere has little effect on the compressive strength of alkali-activated slag cement grouting material. In general, when the water-binder ratio is 0.4, the sand-cement ratio is 1.5, the water glass modulus is 1.4, the alkali equivalent is 8% and the fly ash microsphere content is 10%, the performance of alkali-activated slag cement grouting material is better, and meets the relevant standard requirements.

陈晓磊,田义,魏奇科,等.粉煤灰漂珠对碱矿渣水泥灌浆料性能的影响[J].混凝土与水泥制品,2022(10):84-87. CHEN X L,TIAN Y,WEI Q K,et al.Effect of Fly Ash Microsphere on Properties of Alkali-activated Slag Cement Grouting Material[J].China Concrete and Cement Products,2022(10):84-87.

电厂炉底渣的性能及在混凝土中的应用现状

高仁辉1，曹巍缤2a，庞超明2b，秦鸿根2b，刘家彬2a

2022年第10期

摘要

引用本文

摘要：介绍了电厂炉底渣的性能及其在混凝土中的应用现状。电厂炉底渣的粒径范围与细砂相近，且其密度较低、吸水率较高，化学成分与粉煤灰相近。目前，电厂炉底渣主要应用在以下两个方面：一是取代部分细骨料用于制备混凝土，推荐掺量为10%~50%；二是磨细后用作水泥混合材或混凝土掺合料。通过掺加减水剂、采用活性激发技术等方式可有效缓解电厂炉底渣对混凝土的不利影响。 Abstract: The properties of coal-fired furnace bottom slag and its application status in concrete are introduced. The particle size of coal-fired furnace bottom slag is similar to that of fine sand, and its density is low and the water absorption rate is high, and its chemical composition is similar to that of fly ash. At present, the coal-fired furnace bottom slag is mainly used in the following two aspects: one is to replace part of the fine aggregate with the coal-fired furnace bottom slag to prepare concrete, and the recommended dosage is 10%~50%, the other is to grind the coal-fired furnace bottom slag to be used as cement admixtures or concrete admixtures. The adverse effects of coal-fired furnace bottom slag on concrete can be effectively alleviated by adding water reducing agent and using active excitation technology.

高仁辉,曹巍缤,庞超明,等.电厂炉底渣的性能及在混凝土中的应用现状[J].混凝土与水泥制品,2022(10):78-83,87. GAO R H,CAO W B,PANG C M,et al.Review of Properties of Coal-fired Furnace Bottom Slag and Its Application in Concrete[J].China Concrete and Cement Products,2022(10):78-83,87.

钢筋上焊接锚固板半灌浆套筒力学性能有限元分析

孙志远1，陈权1，夏文传1，姚兵2，刘建2

2022年第10期

摘要

引用本文

摘要：为了减小装配式结构连接用半灌浆套筒破坏时的变形，提出了一种改进的半灌浆套筒，即在钢筋上焊接锚固板，以增加灌浆料与钢筋的机械咬合力。基于已有的半灌浆套筒单调拉伸试验，利用Midas FEA NX有限元软件进行模拟。结果表明：采用混凝土本构模型可以很好地模拟灌浆料的本构模型；半灌浆套筒的破坏状态、模拟结果与试验结果基本吻合，说明所建立的有限元模型是可行的；锚固板的使用不能提高套筒的抗拉强度，但可以大幅提高套筒的整体刚度，提高幅度为8%~10%。 Abstract: In order to reduce the deformation of the semi-grouting sleeve used for the connection of prefabricated structures, an improved semi-grouting sleeve was put forward, in which the anchor plate was welded on the steel bar to increase the mechanical occlusal force between the grouting sleeve and the steel bar. Based on the existing monotonic tensile test of the semi-grouting sleeve, the simulation was carried out using Midas FEA NX finite element software. The results show that the constitutive model of the grouting material can be well simulated by the concrete constitutive model. The failure state of semi-grouting sleeve and the simulation results are basically consistent with the test results, indicating that the finite element model established is feasible. The use of the anchor plate cannot improve the tensile strength of the grouting sleeve, but can greatly improve the overall stiffness of the sleeve by 8% to 10%.

孙志远,陈权,夏文传,等.钢筋上焊接锚固板半灌浆套筒力学性能有限元分析[J].混凝土与水泥制品,2022(10):74-77. SUN Z Y,CHEN Q,XIA W C,et al.Finite Element Analysis of Mechanical Properties of Semi-grouting Sleeve for Welded Anchorage Plate on Steel Bar[J].China Concrete and Cement Products,2022(10):74-77.

陶粒加气混凝土收缩率试验研究

李瑞鸽1，罗敬德1，卢玉华2，林宏剑1，陈羲3，刘鹏1，何政文1，覃业双1

2022年第10期

摘要

引用本文

摘要：研究了自然养护、恒温恒湿养护（温度 20 ℃、湿度70%）、3 d恒温恒湿养护后再自然养护对陶粒加气混凝土收缩率的影响。结果表明：3种养护方式下，试件均是前期膨胀后期收缩，且随着时间的增加，收缩率先快速增大后趋于稳定；恒温恒湿养护试件的前期膨胀率最大，后期收缩率与3 d恒温恒湿养护后再自然养护试件的收缩率相近；自然养护试件的前期膨胀率最小，后期收缩率最大。建议采用先恒温恒湿养护3 d再自然养护24 d的方式养护陶粒加气混凝土，此时，将陶粒加气混凝土应用于墙体砌筑工程时，不仅能加快材料堆放场地的周转，而且能有效减轻墙体收缩开裂。 Abstract: The effects of natural curing, constant temperature and humidity curing (temperature at 20 ℃, humidity at 70%), and natural curing after 3 days of constant temperature and humidity curing on the shrinkage rate of ceramsite aerated concrete were studied. The results show that under the three curing methods, the specimens are expanded in the early stage and contracted in the later stage, and with the increase of time, the shrinkage rate first increases rapidly and then tends to be stable. The early expansion rate of specimens cured at constant temperature and humidity is the largest, and the later shrinkage rate is similar to that of the specimens cured naturally after 3 days of constant temperature and humidity curing. The early expansion rate of natural curing specimens is the smallest, and the later shrinkage rate is the largest. It is suggested that the ceramsite aerated concrete can be cured for 3 days at constant temperature and humidity, and then cured naturally for 24 days. At this time, when the ceramsite aerated concrete is applied to the wall masonry project, it can not only speed up the turnover of the material stacking site, but also effectively reduce the wall shrinkage and cracking.

李瑞鸽,罗敬德,卢玉华,等.陶粒加气混凝土收缩率试验研究[J].混凝土与水泥制品,2022(10):70-73. LI R G,LUO J D,LU Y H,et al.Experimental Study on Shrinkage Rate of Ceramsite Aerated Concrete[J].China Concrete and Cement Products,2022(10):70-73.

GFRP加固损伤钢筋混凝土（RC）短梁受弯性能试验研究

吴玉祥，王廷彦，赵顺波

2022年第10期

摘要

引用本文

摘要：对GFRP布加固未损伤和损伤普通钢筋混凝土（RC）短梁进行了受弯试验，研究了其破坏形态、材料（混凝土、钢筋、GFRP布）应变、抗弯承载力、挠度、曲率和抗弯刚度。结果表明：GFRP布加固未损伤和损伤RC短梁的极限破坏特征一致，破坏时GFRP布被拉断，受压区混凝土未被压碎，属于延性破坏；GFRP布加固未损伤和损伤RC短梁的跨中截面混凝土应变均近似符合平截面假定；GFRP布加固未损伤和损伤RC短梁的荷载-挠度曲线分别呈三阶段和两阶段特征，GFRP布加固损伤RC短梁的荷载-挠度曲线没有开裂阶段，试件的极限承载力得到一定提高；采用GFRP布加固可提高试件的刚度，但会降低其延性；对比GFRP布加固未损伤RC梁，GFRP布加固损伤RC梁的延性提高。 Abstract: Through the flexural tests on undamaged and damaged ordinary reinforced concrete(RC) short beams strengthened with GFRP sheets, the failure modes, material(concrete, steel bar, GFRP sheet) strain, flexural capacity, deflection, curvature and flexural stiffness were studied. The results show that the ultimate failure characteristics of the undamaged and damaged RC short beams strengthened with GFRP sheets are the same, both belong to the ductility failure in which the GFRP sheets are pulled off and the concrete in the compression zone is not crushed. The concrete strains of the mid-span section of the undamaged and damaged RC short beams strengthened with GFRP sheets are approximately consistent with the assumption of plane section. The load-deflection curves of the undamaged and damaged RC short beams strengthened with GFRP sheets are three stages and two stages respectively, and the load-deflection curve of the damaged RC short beams strengthened with GFRP sheets has no cracking stage, and the ultimate bearing capacity of the specimen is improved to a certain extent. Using GFRP sheets can improve the stiffness of the specimen, but it will reduce its ductility. Compared with the undamaged RC short beams strengthened with GFRP sheets, the ductility of the damaged RC short beams strengthened with GFRP sheets is improved.

吴玉祥,王廷彦,赵顺波.GFRP加固损伤钢筋混凝土（RC）短梁受弯性能试验研究[J].混凝土与水泥制品,2022(10):65-69,73. WU Y X,WANG T Y,ZHAO S B.Experimental Study on Flexural Behavior of Damaged Reinforced Concrete(RC) Short Beams Strengthened with GFRP Sheets[J].China Concrete and Cement Products,2022(10):65-69,73.

塑钢纤维增强核桃壳轻骨料混凝土的性能研究

黄正峰1，欧忠文1,2，罗伟1，王飞1

2022年第10期

摘要

引用本文

摘要：研究了塑钢纤维掺量（0.7%、1.0%、1.3%、1.6%、1.9%）对核桃壳轻骨料混凝土性能的影响。结果表明：掺入塑钢纤维后，核桃壳轻骨料混凝土的相对坍落度下降，抗压强度略有提升，劈裂抗拉强度和抗冲击韧性显著提高，透水孔隙率和含气量增大；当塑钢纤维掺量为1.3%时，核桃壳轻骨料混凝土的28 d抗压、劈裂抗拉强度最高，分别为45.2 MPa、3.82 MPa。 Abstract: The influence of the content of plastic steel fiber (0.7%, 1.0%, 1.3%, 1.6%, 1.9%) on the properties of walnut shell lightweight aggregate concrete was studied. The results show that after adding plastic steel fiber, the relative slump of walnut shell lightweight aggregate concrete decreases, the compressive strength increases slightly, the splitting tensile strength and impact toughness increase significantly, and the permeable porosity and air content increase. When the content of plastic steel fiber is 1.3%, the 28 d compressive strength and splitting tensile strength of walnut shell lightweight aggregate concrete are the highest, which are 45.2 MPa and 3.82 MPa respectively.

黄正峰,欧忠文,罗伟,等.塑钢纤维增强核桃壳轻骨料混凝土的性能研究[J].混凝土与水泥制品,2022(10):60-64. HUANG Z F,OU Z W,LUO Wei,et al.Study on Properties of Walnut Shell Lightweight Aggregate Concrete Reinforced by Plastic Steel Fiber[J].China Concrete and Cement Products,2022(10):60-64.

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