第四期_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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第四期

《混凝土与水泥制品》热点专题征稿启事

2022年第4期

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轻质碱渣-氯氧镁水泥基材料性能研究及孔结构特征分析

余海燕，胡林童

2022年第4期

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摘要：以碱渣、MgO、MgSO4·7H2O等为主要原材料，制备了轻质碱渣-氯氧镁水泥基材料，研究了养护温度、发泡剂掺量、稳泡剂掺量对轻质碱渣-氯氧镁水泥基材料性能的影响，并对其孔结构进行了分析。结果表明：当养护温度为60 ℃、发泡剂掺量为5%、稳泡剂掺量为6%时，轻质碱渣-氯氧镁水泥基材料的各项性能最优，干密度为597 kg/m3、抗压强度为2.7 MPa、导热系数为0.21 W/（m·K）、吸水率为15.1%、软化系数为0.83、28 d收缩率为0.17%。 Abstract: Light alkali residue-magnesium oxychloride cement-based materials were prepared with alkali residue, magnesium oxide and magnesium sulfate heptahydrate as the main raw materials. The effects of curing temperature, foaming agent content and foam stabilizer content on the properties of light alkali residue-magnesium oxychloride cement-based materials were studied, and the pore structure was analyzed. The results show that when the curing temperature is 60 ℃, the content of foaming agent is 5% and the content of foam stabilizer is 6%, the properties of light alkali residue-magnesium oxychloride cement-based materials are the best, with dry density of 597 kg/m3, compressive strength of 2.7 MPa, thermal conductivity of 0.21 W/（m·K）, water absorption of 15.1%, softening coefficient of 0.83 and 28 d shrinkage rate of 0.17%.

余海燕,胡林童.轻质碱渣-氯氧镁水泥基材料性能研究及孔结构特征分析[J].混凝土与水泥制品,2022(4):78-83. YU H Y,HU L T.Experimental Study on Properties and Pore Structure Characteristics of Light Alkali Residue-magnesium Oxychloride Cement-based Materials[J].China Concrete and Cement Products,2022(4):78-83.

基于Weibull分布的再生混凝土中钢筋锈蚀预测

王子健1，彭金贵2，郭飞2，苏睿3，乔宏霞3

2022年第4期

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摘要：为了解决西部盐渍土环境下再生混凝土中钢筋的寿命预测问题，采用电化学测试仪对浸泡在氯盐溶液中的再生骨料钢筋混凝土进行了电化学试验，得到了表征钢筋腐蚀的腐蚀电流密度及自腐蚀电位两个指标。利用最小二乘法对Weibull参数做了进一步估计，在Weibull分布函数的基础上对钢筋腐蚀后的寿命进行了建模。结果表明：再生混凝土中的钢筋加速腐蚀至30个月时，其腐蚀电流密度最高为0.058 4 μA/cm2，处于未腐蚀状态；将钢筋低腐蚀与中等腐蚀的界限值（0.5 μA/cm2）作为钢筋达到高腐蚀状态时的阈值，确定出再生混凝土中钢筋在第750个月时的可靠度函数开始趋近于零，处于中等腐蚀状态，从而直观反映了钢筋在实际环境中的有效使用寿命，可为再生混凝土中钢筋的维护与检测提供参考。 Abstract: In order to solve the problem of steel bar life prediction in recycled concrete in the western saline soil environment, the electrochemical test of recycled aggregate reinforced concrete soaked in chloride solution was carried out by using an electrochemical tester, and the corrosion current density and self-corrosion potential of steel bar were obtained. The least-squares method was used to further estimate the Weibull parameters, and the life of the steel bars after corrosion was modeled based on the Weibull distribution function. The results show that when the steel bar in recycled concrete is accelerated to 30 months, the maximum corrosion current density is 0.058 4 μA/cm2, and the steel bars are in non corrosive state. Taking the limit value of low corrosion and moderate corrosion of steel bars(0.5 μA/cm2) as the threshold value when steel bars reach high corrosion state, it is determined that the reliability function of steel bar in recycled concrete begins to approach zero at 750 months and is in the medium corrosive state, which directly reflects the effective service life of the steel bars in the actual environment. It can provide a reference for the maintenance and detection of steel bars in recycled concrete.

王子健,彭金贵,郭飞,等.基于Weibull分布的再生混凝土中钢筋锈蚀预测[J].混凝土与水泥制品,2022(4):84-88,93. WANG Z J,PENG J G,GUO F,et al.Prediction of Steel Bar Corrosion in Recycled Concrete Based on Weibull Distribution[J].China Concrete and Cement Products,2022(4):84-88,93.

全铁尾矿骨料混凝土的工作性、力学性能及耐久性能研究

康迎杰1，郭自利1，潘鹏1，2

2022年第4期

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摘要：利用铁尾矿机制砂石完全替代天然砂石，制备了全铁尾矿骨料混凝土，研究了全铁尾矿骨料混凝土和天然骨料混凝土的工作性、力学性能和耐久性能差异。结果表明：在工作性方面，需通过调配外加剂的方法来保证全铁尾矿骨料混凝土良好的工作性；在力学性能方面，全铁尾矿骨料混凝土的抗压、抗折和劈裂抗拉强度与天然骨料混凝土相比差别不大；在耐久性能方面，全铁尾矿骨料混凝土的抗氯离子渗透性能、抗碳化性能、抗冻性能及抗硫酸盐侵蚀性能均与天然骨料混凝土接近。 Abstract: Using iron tailings machine-made sand and stone to completely replace natural sand and stone, all-iron tailings aggregate concrete was prepared, and the difference between all-iron tailings aggregate concrete and natural aggregate concrete in workability, mechanical properties and durability was studied. The results show that in terms of workability, it is recommended to ensure the good workability of all-iron tailings aggregate concrete by mixing admixtures. In terms of mechanical properties, the compressive, flexural and splitting tensile strength of all-iron tailings aggregate concrete are little different from those of natural aggregate concrete. In terms of durability, the chloride ion penetration resistance, carbonation resistance, frost resistance and sulfate resistance of all-iron tailings aggregate concrete are close to those of natural aggregate concrete.

康迎杰,郭自利,潘鹏.全铁尾矿骨料混凝土的工作性、力学性能及耐久性能研究[J].混凝土与水泥制品,2022(4):89-93. KANG Y J,GUO Z L,PAN P.Study on Workability, Mechanical Properties and Durability of All-iron Tailings Aggregate Concrete[J].China Concrete and Cement Products,2022(4):89-93.

改性磷石膏矿渣水泥在混凝土和路基材料中的应用研究

胡彪，吴赤球，吕伟，龚文辉

2022年第4期

摘要

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摘要：利用生石灰对磷石膏进行改性，得到改性磷石膏，将改性磷石膏、矿渣粉、水泥按一定比例混合均匀，通过粉磨制得改性磷石膏矿渣水泥，分析研究了改性磷石膏矿渣水泥的性能及改性磷石膏矿渣水泥在混凝土和路基材料中应用的可行性。结果表明：与未改性磷石膏相比，利用改性磷石膏制得的水泥早期强度有所提高；以改性磷石膏矿渣水泥为胶凝材料的混凝土和路基材料的早期强度增长较慢，但中后期强度可实现稳定增长；将改性磷石膏应用于混凝土和路基材料中时，其中的磷、氟等杂质可得到有效固化，对生态环境的影响较小。研制的改性磷石膏相关产品具有良好的结构功能性与安全环保性，已成功应用于道路工程。 Abstract: The phosphogypsum was modified with quicklime to obtain modified phosphogypsum. The modified phosphogypsum, slag powder and cement were mixed uniformly in a certain proportion, and then ground to obtain modified phosphogypsum slag cement. The properties of modified phosphogypsum slag cement and the feasibility of modified phosphogypsum slag cement in concrete and roadbed materials were analyzed. The results show that compared with unmodified phosphogypsum, the early strength of cement prepared with modified phosphogypsum is improved. The early strength growth of concrete and roadbed materials using modified phosphogypsum slag cement as cementitious material is slow, but the strength can achieve stable growth in the middle and late stages. When the modified phosphogypsum is applied to concrete and roadbed materials, impurities such as phosphorus and fluorine can be effectively cured, and the impact on the ecological environment is small. The developed modified phosphogypsum related products have good structural functionality and safety and environmental protection, and have been successfully applied to road engineering.

胡彪,吴赤球,吕伟,等.改性磷石膏矿渣水泥在混凝土和路基材料中的应用研究[J].混凝土与水泥制品,2022(4):97-99. HU B,WU C Q,LYU W,et al.Study on the Application of Modified Phosphogypsum Slag Cement in Concrete and Roadbed Materials[J].China Concrete and Cement Products,2022(4):97-99.

轻质高强抗裂隔墙板的制备及试验研究

王清1，刘成健2，岳汉威1

2022年第4期

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王清,刘成健,岳汉威.轻质高强抗裂隔墙板的制备及试验研究[J].混凝土与水泥制品,2022(4):59-63. WANG Q,LIU C J,YUE H W.Preparation and Experimental Study of Lightweight High-strength Crack Resistance Partition Wall Boards[J].China Concrete and Cement Products,2022(4):59-63.

基于ABAQUS的型钢-RPC梁抗弯性能试验验证

段吉强，邓年春，李颢旭

2022年第4期

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摘要：为了研究利用ABAQUS软件模拟活性粉末混凝土（RPC）梁抗弯性能的适用性，基于该软件中的混凝土材料塑性损伤（CDP）模型，针对RPC不同的本构模型，采用当前几种主流的塑性损伤因子计算方法，得到了适用于RPC材料的CDP参数。结合已有的型钢-RPC梁抗弯性能试验，将RPC材料的CDP参数输入ABAQUS软件中，建立了考虑型钢与RPC之间黏结滑移的有限元模型，并将模拟得到的荷载-挠度曲线与试验实测曲线进行了对比。结果表明：在试验实测RPC材料特征值参数值以及合适的RPC本构关系及塑性损伤因子计算方法的基础上，考虑型钢与RPC之间黏结滑移的数值模拟结果与试验结果吻合较好；建议模拟时选择下降段较缓和的受压应力-应变曲线，受拉应力-应变曲线近似强化模型，采用能量损失法及Sidoroff能量等价原理计算RPC材料的CDP参数。 Abstract: In order to study the applicability of using ABAQUS software to simulate the flexural performance of reactive powder concrete(RPC) beams, based on the concrete material plastic damage(CDP) model in ABAQUS software, according to different constitutive models of RPC, several current mainstream plastic damage factor calculation methods were used to obtain the CDP parameters suitable for RPC material. Combined with the existing flexural performance tests of section steel-RPC beams, the CDP parameters of the RPC material were input into the ABAQUS software, and a finite element model considering the bond-slip between the section steel and RPC was established, and the load-deflection curves obtained from the simulation were compared with the measured curves. The results show that on the basis of the eigenvalue parameters of the RPC material measured in the test and the appropriate calculation method of the RPC constitutive relation and the plastic damage factor, the numerical simulation results considering the bond-slip between the section steel and the RPC are in good agreement with the experimental results. It is recommended to select a gentler compressive stress-strain curve in the descending section during simulation, and approximate the strengthening model of the tensile stress-strain curve, and use the energy loss method and the Sidoroff energy equivalent principle to calculate the CDP parameters of RPC.

段吉强,邓年春,李颢旭.基于ABAQUS的型钢-RPC梁抗弯性能试验验证[J].混凝土与水泥制品,2022(4):64-71. DUAN J Q,DENG N C,LI H X.Experimental Verification of Flexural Performance of Section Steel-RPC Beam Based on ABAQUS[J].China Concrete and Cement Products,2022(4):64-71.

构造钢筋对改性RPC-普通混凝土结合面性能影响试验研究

王欣1，杨哲1，张国强2，陈国斌2，刘黎明3，刘国安1

2022年第4期

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王欣,杨哲,张国强,等.构造钢筋对改性RPC-普通混凝土结合面性能影响试验研究[J].混凝土与水泥制品,2022(4):72-77. WANG X,YANG Z,ZHANG G Q,et al.Experimental Study on the Influence of Structural Steel Bars on the Performance of Modified RPC-normal Concrete Interface[J].China Concrete and Cement Products,2022(4):72-77.

层布式陶瓷纤维混凝土的抗折性能试验研究

肖娴1，高林1,2，刘昆雄1，郭凯旋1

2022年第4期

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肖娴,高林,刘昆雄,等.层布式陶瓷纤维混凝土的抗折性能试验研究[J].混凝土与水泥制品,2022(4):46-49. XIAO X,GAO L,LIU K X,et al.Experimental Study on Flexural Properties of Laminated Ceramic Fiber Reinforced Concrete[J].China Concrete and Cement Products,2022(4):46-49.

高温后钢纤维增强混凝土的空气渗透性试验研究

何佳欢1，韩阳1，沈雷2，陈家豪1，朱德1，谭晗洋1

2022年第4期

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摘要：采用Torrent法研究了受热温度和钢纤维掺量对高强混凝土空气渗透系数和渗透深度的影响。结果表明：常温下，在高强混凝土中分别掺入体积分数为1%和2%的钢纤维后，试件的空气渗透系数分别降低了约76%和55%；在钢纤维掺量相同的情况下，随着受热温度的升高，试件的空气渗透系数和渗透深度均增大，150 ℃之后，空气渗透系数和渗透深度的增大趋势更加显著；钢纤维的掺入能够显著提升高强混凝土的抗渗性。 Abstract: The effects of heating temperature and steel fiber content on the air permeability coefficient and penetration depth of high-strength concrete were studied by the Torrent method. The results show that the air permeability coefficients of the specimens are reduced by about 76% and 55% respectively after adding steel fibers with a volume fraction of 1% and 2% into the high-strength concrete at room temperature. In the case of the same steel fiber content, with the increase of heating temperature, the air permeability coefficient and penetration depth of the specimen both increase, and the increase trend is more significant after 150 ℃. The incorporation of steel fiber can significantly improve the impermeability of high-strength concrete.

何佳欢,韩阳,沈雷,等.高温后钢纤维增强混凝土的空气渗透性试验研究[J].混凝土与水泥制品,2022(4):50-54. HE J H,HAN Y,SHEN L,et al.Experimental Study on Air Permeability of Steel Fiber Reinforced Concrete After High Temperature[J].China Concrete and Cement Products,2022(4):50-54.

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