第三期_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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第三期

碱式硫酸镁水泥的生命周期评价

李莹江1a，徐迅1a，2a，胡海龙1b，李丹1a，余波2a，2b，2c

2023年第3期

摘要

引用本文

摘要：为了评估碱式硫酸镁水泥对环境的影响，采用生命周期评价（LCA）方法，定量分析了碱式硫酸镁水泥的3种原材料在15项中点类别（致癌物质、非致癌物质、可吸入无机物等）和4项终点类别（人类健康、生态系统质量、气候变化、资源消耗）上的影响，并对比分析了不同镁质水泥的环境影响。结果表明：碱式硫酸镁水泥在水生生态毒性上的影响值最高，在臭氧层破坏上的影响值最低；氧化镁在致癌物质、非致癌物质和水生生态毒性上的影响占比较大，均超过85.00%；七水硫酸镁在电离辐射上的影响占比（53.67%）较大；柠檬酸在土地占有上的影响占比（68.80%）较大；在4项终点类别上，氧化镁的环境影响最大，七水硫酸镁次之，柠檬酸最小；与活性氧化镁水泥、磷酸镁水泥、氯氧镁水泥相比，碱式硫酸镁水泥在9项中点类别（致癌物质、非致癌物质、可吸入无机物等）和2项终点类别（气候变化、资源消耗）上优势明显。 Abstract: In order to evaluate the impact of basic magnesium sulfate cement on the environment, life cycle assessment (LCA) method was used to quantitatively analyze the impact of three raw materials of basic magnesium sulfate cement on fifteen midpoint categories (carcinogens, non-carcinogens, inhalable inorganic substances, etc.) and four endpoint categories (human health, ecosystem quality, climate change, resource consumption). The environmental impact of different types of magnesia cement was discussed. The results show that basic magnesium sulfate cement has the highest impact value on aquatic ecotoxicity and the lowest impact value on ozone depletion. Magnesium oxide has a relatively large impact on carcinogens, non-carcinogens and aquatic ecotoxicity, with the impact ratio exceeding 85.00%. The influence of magnesium sulfate heptahydrate on ionizing radiation is relatively large, with the impact ratio of 53.67%. The influence of citric acid on land possession is relatively large, with the impact ratio of 68.80%. In the four endpoint categories, magnesium oxide has the largest environmental impact, followed by magnesium sulfate heptahydrate, and citric acid is the smallest. Compared with the active magnesium oxide cement, magnesium phosphate cement and magnesium oxychloride cement, the basic magnesium sulfate cement has obvious advantages in the nine midpoint categories (carcinogens, non-carcinogens, inhalable inorganic substances, etc.) and two endpoint categories (climate change and resource consumption).

李莹江,徐迅,胡海龙,等.碱式硫酸镁水泥的生命周期评价[J].混凝土与水泥制品,2023(3):78-82. LI Y J,XU X,HU H L,et al.Life Cycle Evaluation of Basic Magnesium Sulfate Cement[J].China Concrete and Cement Products,2023(3):78-82.

钢渣混凝土的抗碳化性能及寿命预测

王成刚1，2，王帅1，马兵辉3，汪陈林1，幸飞宇1

2023年第3期

摘要

引用本文

摘要：采用钢渣石、钢渣砂分别等质量取代碎石、河砂制备了钢渣混凝土，研究了钢渣混凝土的抗碳化性能，并建立了不同保护层厚度钢渣混凝土的碳化寿命预测模型。结果表明：随着钢渣石、钢渣砂取代率的增加，试件的抗碳化性能先增强后减弱，且当钢渣石、钢渣砂取代率均为50%时，试件的抗碳化性能最好；建立的碳化寿命预测模型的精度较高，可为实际工程中钢渣混凝土结构的碳化寿命预测提供参考。 Abstract: Steel slag concrete was prepared by replacing gravel and river sand with steel slag stone and steel slag sand of equal quality. The carbonation resistance of steel slag concrete was studied, and the carbonation life prediction model of steel slag concrete with different protective layer thickness was established. The results show that with the increase of the replacement rate of steel slag stone and steel slag sand, the carbonation resistance of the specimen first increases and then decreases, and when the replacement rate is 50%, the carbonation resistance of the specimen is the best. The established carbonation life prediction model has high accuracy, which can provide a reference for the carbonation life prediction of steel slag concrete structures in practical engineering.

王成刚,王帅,马兵辉,等.钢渣混凝土的抗碳化性能及寿命预测[J].混凝土与水泥制品,2023(3):83-86,91. WANG C G,WANG S,MA B H,et al.Carbonization Resistance and Life Prediction of Steel Slag Concrete[J].China Concrete and Cement Products,2023(3):83-86,91.

硅灰类型对碱集料反应的影响及机理分析

赵明，汪冬冬，张悦然

2023年第3期

摘要

引用本文

摘要：采用快速砂浆棒法研究了原状硅灰和增密硅灰对活性骨料碱集料反应（AAR）的影响，采用岩相法分析了增密硅灰发生反应后的形貌及膨胀开裂现象。结果表明：原状硅灰可以明显地抑制活性骨料发生AAR，增密硅灰则会加剧碱硅酸反应（ASR）；原状硅灰颗粒微小，在砂浆中分散均匀，主要发生火山灰反应，消耗砂浆孔溶液中的碱，降低孔溶液的pH值，且形成的低钙硅比C-S-H凝胶还能进一步捕捉体系中的碱，从而抑制发生AAR；增密硅灰中的部分颗粒难以在砂浆搅拌过程中充分破碎和分散，会与碱发生ASR而非火山灰反应，形成的ASR凝胶吸水膨胀，加剧了活性骨料的AAR和膨胀。 Abstract: The effect of undensified silica fume and densified silica fume on the alkali-aggregate reaction(AAR) of reactive aggregates was studied by using the accelerated mortar bar method. The morphology and expansion cracking of densified silica fume after reaction were analyzed by using the petrographic method. The results show that the undensified silica fume can obviously inhibit the AAR of the reactive aggregates, but the densified silica fume aggravates the alkali-silica reaction(ASR). The undensified silica fume particles are small and evenly dispersed in the mortar, mainly producing pozzolanic reaction, consuming the alkali in the mortar pore solution, reducing the pH value of the pore solution, and the formed low calcium silica ratio C-S-H gel can further capture the alkali in the system, thus inhibiting the AAR. Some particles in densified silica fume are difficult to be fully broken and dispersed during mortar mixing, and will react with alkali in ASR rather than pozzolanic reaction, and the formed ASR gel absorbs water and expands, which intensifies the AAR and the expansion of reactive aggregates.

赵明,汪冬冬,张悦然.硅灰类型对碱集料反应的影响及机理分析[J].混凝土与水泥制品,2023(3):87-91. ZHAO M,WANG D D,ZHANG Y R.Effect of Silica Fume Type on Alkali-aggregate Reaction and Its Mechanism Analysis[J].China Concrete and Cement Products,2023(3):87-91.

铁尾矿粉和磷渣粉对再生混凝土抗氯离子渗透性能的影响

赵俭斌，牟道平，杜松岩，张延年

2023年第3期

摘要

引用本文

摘要：通过RCM试验、电通量试验和氯离子固化试验，研究了铁尾矿粉和磷渣粉分别单掺和复掺（等质量替代30%水泥）对再生混凝土抗氯离子渗透性能的影响。结果表明：单掺和复掺铁尾矿粉与磷渣粉均能提高再生混凝土的抗氯离子渗透性能，且复掺时铁尾矿粉掺量越大，抗氯离子渗透性能越好；随着铁尾矿粉掺量的增加，再生混凝土的氯离子结合能力提高；在氯离子浓度较低的环境下，再生混凝土中的氯离子主要以物理吸附和化学结合两种形式存在；在氯离子浓度较高的环境下，再生混凝土中的氯离子主要以化学结合形式存在，物理吸附作用相对较弱。 Abstract: Through RCM test, electric flux test and chloride ion curing test, the influence of iron tailings powder and phosphorus slag powder (replacing 30% cement) on the chloride ion penetration resistance of recycled concrete was studied. The results show that the chloride ion penetration resistance of concrete can be improved by adding iron tailings powder and phosphorus slag powder. When mixed, the greater the content of iron tailings powder, the better the chloride ion penetration resistance. With the increase of the content of iron tailings powder, the chloride binding capacity of recycled concrete increases. In the environment with low chloride ion concentration, chloride ions in recycled concrete mainly exist in the form of physical adsorption and chemical binding. In the environment with high chloride ion concentration, the chloride ions in recycled concrete mainly exist in the form of chemical binding, and the physical adsorption is relatively weak.

赵俭斌,牟道平,杜松岩,等.铁尾矿粉和磷渣粉对再生混凝土抗氯离子渗透性能的影响[J].混凝土与水泥制品,2023(3):92-95. ZHAO J B,MOU D P,DU S Y,et al.Effect of Iron Tailings Powder and Phosphorus Slag Powder on Chloride Ion Penetration Resistance of Recycled Concrete[J].China Concrete and Cement Products,2023(3):92-95.

再生混凝土粉和再生砖粉活化技术研究进展

方维炯1，宣晓鑫1，赵建明2，崔新忠3，梁超锋3，高越青3

2023年第3期

摘要

引用本文

摘要：介绍了再生混凝土粉（RCP）和再生砖粉（RBP）的基本特性，分析了机械活化、热活化、碳化活化、碱激发等活化方式对RCP和RBP活性的影响，并探讨了相关活化机理，总结了各活化方式的优点与不足，可为再生微粉活化方式的优选提供参考。 Abstract: The basic characteristics of recycled concrete powder (RCP) and recycled brick powder (RBP) are introduced. The effects of mechanical activation, thermal activation, carbonation activation, alkali activation and other activation technologies on the activities of RCP and RBP are analyzed, and the relevant activation mechanisms are discussed. The advantages and disadvantages of each activation technology are summarized, which can provide a reference for the selection of recycled micro powder activation technology.

方维炯,宣晓鑫,赵建明,等.再生混凝土粉和再生砖粉活化技术研究进展[J].混凝土与水泥制品,2023(3):96-101 FANG W J,XUAN X X,ZHAO J M,et al.Research Progress on Activation Technology of Recycled Concrete Powder and Recycled Brick Powder[J].China Concrete and Cement Products,2023(3):96-101

建筑废弃物轻质隔墙板的制备及力学性能研究

谭春雷1，任吉2，崔李三1，邓宇1

2023年第3期

摘要

引用本文

摘要：以硅烷偶联剂、木质素纤维、双氧水作为改性剂，对建筑废弃物粉末进行改性，并将改性后形成的水性复配物作为胶凝材料替代部分水泥，与建筑废弃物颗粒充分混合，制成轻质隔墙板，研究了木质素纤维掺量和建筑废弃物颗粒掺量对轻质隔墙板力学性能的影响，并进行了SEM微观分析。结果表明：改性后的建筑废弃物水性复配物具有与水泥相同功效的凝胶性质，在交联聚合作用下，可形成稳定的三维网络结构，有效提高轻质隔墙板的力学强度；随着木质素纤维掺量和建筑废弃物颗粒掺量的增加，轻质隔墙板的力学性能均呈先增大后减小的趋势，最佳木质素纤维掺量为6%，适宜建筑废弃物颗粒掺量为42%左右。 Abstract: With silane coupling agent, lignin fiber and hydrogen peroxide as modifiers, the construction waste powder was modified, and the modified water-based compound was used as the cementitious material to replace part of cement, which was fully mixed with the construction waste particles to prepare lightweight partition board. The influence of lignin fiber content and construction waste particle content on the mechanical properties of lightweight partition board was studied, and the SEM microscopic analysis was carried out. The results show that the modified water-borne compound of construction waste has the same gel property as cement, and can form a stable three-dimensional network structure under the cross-linking polymerization, effectively improving the mechanical strength of lightweight partition board. With the increase of lignin fiber content and construction waste particle content, the mechanical properties of lightweight partition board are increased first and then decreased, and the optimum content of lignin fiber is 6%, and the suitable content of construction waste particle is about 42%.

谭春雷,任吉,崔李三,等.建筑废弃物轻质隔墙板的制备及力学性能研究[J].混凝土与水泥制品,2023(3):74-77. TAN C L,REN J,CUI L S,et al.Study on Preparation and Mechanical Properties of Lightweight Partition Board with Construction Waste[J].China Concrete and Cement Products,2023(3):74-77.

轻质陶粒混凝土的配合比优化及性能研究

黄炜蓥1，黄群艺1，2，梁罗1

2023年第3期

摘要

引用本文

摘要：为了解决装配式结构在村镇建筑应用中存在预制构件自重较大、运输和安装要求较高等问题，用轻质陶粒混凝土替代普通混凝土生产预制构件，以减轻预制构件的重量。开展轻质陶粒混凝土的配合比优化及性能试验研究。结果表明：轻质陶粒混凝土中的水泥、砂、陶粒、水用量分别为400、540、450、170 kg/m3时，试件的干表观密度为1 816.7 kg/m3，满足轻质混凝土相关要求；28 d抗压强度为35.5 MPa，满足承重构件强度要求；坍落度为78 mm，和易性满足30~80 mm要求。 Abstract: In order to solve the problems of prefabricated components in village and town building applications, such as the large self-weight of prefabricated components and the high requirements for transportation and installation, lightweight ceramsite concrete was used to replace ordinary concrete to produce prefabricated components to reduce the weight of prefabricated components. The mix proportion optimization and performance test of lightweight ceramsite concrete were carried out. The results show that when the amount of cement, sand, ceramsite and water in lightweight ceramsite concrete is 400, 540, 450 and 170 kg/m3 respectively, the dry apparent density of the specimen is 1 816.7 kg/m3, which meets the relevant requirements of lightweight concrete. The 28 d compressive strength is 35.5 MPa, meeting the strength requirements of load-bearing components. The slump is 78 mm, and the workability meets the requirements of 30~80 mm.

黄炜蓥,黄群艺,梁罗.轻质陶粒混凝土的配合比优化及性能研究[J].混凝土与水泥制品,2023(3):70-73. HUANG W Y,HUANG Q Y,LIANG L.Study on Mix Proportion Optimization and Performance of Lightweight Ceramsite Concrete[J].China Concrete and Cement Products,2023(3):70-73.

配工字型钢混凝土梁的剪扭性能数值模拟分析

谢强，邵永健，严舒云

2023年第3期

摘要

引用本文

摘要：试验研究了4个配工字型钢混凝土梁试件和1个钢筋混凝土梁试件的剪扭性能，并用ABAQUS软件进行了数值模拟，分析了截面配钢率、混凝土强度、截面尺寸、箍筋间距对梁剪扭性能的影响。结果表明：模拟得到的扭矩-扭率曲线与试验值吻合较好；梁的极限扭矩随着截面配钢率的增大而增大，但当截面配钢率大于3.48%后，对极限扭矩的提高有限；随着混凝土强度的增加，梁的屈服扭矩和极限扭矩均增大，开裂扭率增大；梁的初始刚度、屈服扭矩、极限扭矩和延性均随着截面尺寸的增大而显著提升；提高截面配钢率和降低箍筋间距均可提升梁的延性。 Abstract: The shear torsional performance of four I-shaped steel reinforced concrete beams and one reinforced concrete beam was studied experimentally, and the numerical simulation was carried out with ABAQUS software, and the effects of section steel ratio, concrete strength, section size and stirrup spacing on the shear torsional performance of beams were analyzed. The results show that the simulated torque-torsion curves of the specimens are in good agreement with the experimental values. The ultimate torque of the beam increases with the increase of the section steel ratio, but when the section steel ratio is greater than 3.48%, the increase of the ultimate torque is limited. With the increase of concrete strength, the yield torque and ultimate torque of the beam increase, and the cracking torsion rate increases. The initial stiffness, yield torque, ultimate torque and ductility of the beam increase significantly with the increase of the section size. The ductility of the beam can be improved by increasing the section steel ratio and reducing the stirrup spacing.

谢强,邵永健,严舒云.配工字型钢混凝土梁的剪扭性能数值模拟分析[J].混凝土与水泥制品,2023(3):64-69. XIE Q,SHAO Y J,YAN S Y.Numerical Simulation Analysis of Shear Torsional Performance of I- shaped Steel Reinforced Concrete Beams[J].China Concrete and Cement Products,2023(3):64-69.

高温下钢纤维陶瓷骨料混凝土的劈裂抗拉性能研究

刘洋帆，陶俊林

2023年第3期

摘要

引用本文

摘要：研究了温度(20、170、220、270、320、500、750、1 000 ℃)和加载率（0.5 kN/s、5.0 kN/s）对普通混凝土和钢纤维陶瓷骨料混凝土劈裂抗拉性能的影响。结果表明：高温下普通混凝土与钢纤维陶瓷骨料混凝土的劈裂抗拉强度均存在加载率强化效应；普通混凝土的劈裂抗拉强度在20~1 000 ℃内总体表现为温度软化效应，其中，在170~220 ℃内以温度强化效应为主；钢纤维陶瓷骨料混凝土的劈裂抗拉强度表现出明显的温度软化效应；各温度下，钢纤维陶瓷骨料混凝土的的劈裂抗拉强度均高于普通混凝土，表现出良好的耐高温性能。 Abstract: The effects of temperatures (20, 170, 220, 270, 320, 500, 750, 1 000 ℃) and loading rates (0.5 kN/s, 5.0 kN/s) on the splitting tensile properties of ordinary concrete and steel fiber reinforced ceramic aggregate concrete were studied. The results show that the splitting tensile strength of ordinary concrete and steel fiber reinforced ceramic aggregate concrete under high temperature is strengthened by loading rate. The splitting tensile strength of ordinary concrete generally shows the temperature softening effect at 20~1 000 ℃, and the temperature strengthening effect is dominant at 170~220 ℃. The splitting tensile strength of steel fiber reinforced ceramic aggregate concrete shows obvious temperature softening effect. At all temperatures, the splitting tensile strength of steel fiber reinforced ceramic aggregate concrete is higher than that of ordinary concrete, showing good high temperature resistance.

刘洋帆,陶俊林.高温下钢纤维陶瓷骨料混凝土的劈裂抗拉性能研究[J].混凝土与水泥制品,2023(3):51-55. LIU Y F,TAO J L.Study on Splitting Tensile Properties of Steel Fiber Reinforced Ceramic Aggregate Concrete at High Temperature[J].China Concrete and Cement Products,2023(3):51-55.

钢纤维混凝土的受力破坏机制及力学性能研究

任宏伟

2023年第3期

摘要

引用本文

摘要：采用试验和数值模拟相结合的方法，对比研究了普通混凝土和钢纤维混凝土的力学性能、应力-应变响应、破坏特征和声发射规律。结果表明：随着钢纤维体积掺量的增加，试件的抗压和抗折强度均呈先增大后减小的趋势，适宜掺量范围为2.0%~2.5%，超过该掺量范围后，试件的抗压和抗折强度降低；掺入适量钢纤维可增大混凝土的弹性模量和残余强度，增强混凝土的峰后延性，改善混凝土的破坏形态。 Abstract: The mechanical properties, stress-strain response, failure characteristics and acoustic emission laws of ordinary concrete and steel fiber reinforced concrete were compared and studied by means of tests and numerical simulation. The results show that with the increase of steel fiber volume content, the compressive and flexural strength of the specimen first increase and then decrease, and the appropriate content range is 2.0%~2.5%. When the content range is exceeded, the compressive and flexural strength decrease. Adding appropriate content of steel fiber can increase the elastic modulus and residual strength of concrete, enhance the post-peak ductility of concrete, and improve the failure mode of concrete.

任宏伟.钢纤维混凝土的受力破坏机制及力学性能研究[J].混凝土与水泥制品,2023(3):56-59,63. REN H W.Study on the Failure Mechanism and Mechanical Properties of Steel Fiber Reinforced Concrete[J].China Concrete and Cement Products,2023(3):56-59,63.

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