第三期_2024_《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

不同加热方式下高温后防辐射混凝土的性能研究

王若祥1，陈振富1，2，*，陶秋旺1，谢利平3

2024年第3期

摘要

引用本文

摘要：以磁铁矿为骨料制备了防辐射混凝土，研究了不同加热方式（微波辐射加热、马弗炉加热）和温度（25~800 ℃）对防辐射混凝土外观形貌、抗压强度、超声波波速和屏蔽性能的影响。结果表明：在相同加热方式下，随着温度的升高，试件的外观形貌劣化程度加重，抗压强度、超声波波速、屏蔽性能均降低；与马弗炉加热相比，微波辐射加热在各个温度区间内对试件造成的损伤均较大。 Abstract: Radiation shielding concrete was prepared by using magnetite as aggregates, and the effects of different heating modes (microwave radiation heating, muffle furnace heating) and temperatures (25~800 ℃) on the apparent morphology, compressive strength, ultrasonic wave velocity, and shielding performance of radiation shielding concrete were studied. The results show that under the same heating mode, as the temperature increases, the deterioration degree of the apparent morphology of the specimen increases, and the compressive strength, ultrasonic wave velocity, and shielding performance of the specimen decrease. Compared with muffle furnace heating, microwave radiation heating causes greater damage to the specimen in various temperature ranges.

王若祥，陈振富，陶秋旺,等.不同加热方式下高温后防辐射混凝土的性能研究[J].混凝土与水泥制品,2024(3):79-83,89. WANG R X,CHEN Z F,TAO Q W,et al.Study on properties of radiation shielding concrete after high temperature under different heating modes[J].China Concrete and Cement Products,2024(3):79-83,89.

粉煤灰基地聚物混凝土的抗氯盐侵蚀性能研究

谭云

2024年第3期

摘要

引用本文

摘要：对比研究了氯盐侵蚀0~360 d内，粉煤灰基地聚物混凝土（以下简称FABGC）与普通混凝土（以下简称OPC）的抗压强度、质量损失率、氯离子含量、氯离子扩散系数、微观结构。结果表明：各侵蚀龄期下，OPC的抗压强度、质量损失率、氯离子含量基本均高于FABGC；随着侵蚀龄期的增加，FABGC和OPC的抗压强度、氯离子扩散系数基本呈下降趋势，质量损失率、氯离子含量呈增大趋势；当侵蚀龄期达到60 d后，OPC的抗压强度损失率、质量损失率和氯离子扩散系数均明显高于FABGC；随着侵蚀深度的增加，FABGC与OPC氯离子含量逐渐降低；与FABGC相比，未受氯盐侵蚀时，OPC的微观结构更致密，但受氯盐侵蚀后，OPC的微观结构劣化速率较快。 Abstract: The compressive strength, mass loss rate, chloride ion content, chloride diffusion coefficient, and microstructure of fly ash based geopolymer concrete (FABGC) and ordinary concrete (OPC) were investigated comparatively in the chlorine salt erosion environment during 0~360 d. The results show that the compressive strength, mass loss rate, and chloride ion content of OPC are basically higher than those of FABGC at each erosion age. With the increase of erosion age, the compressive strength and chloride ion diffusion coefficient of FABGC and OPC basically show a decreasing trend, and the mass loss rate and chloride content show an increasing trend. When the erosion age reaches 60 d, the compressive strength loss rate, mass loss rate, and chloride ion diffusion coefficient of OPC are significantly higher than those of FABGC. With the increase of erosion depth, the chloride ion content of FABGC and OPC gradually decreases. Compared with FABGC, the microstructure of OPC is denser when it is not subjected to chloride salt erosion environment, but the microstructure deterioration rate of OPC is faster when it is subjected to chloride salt erosion environment.

谭云.粉煤灰基地聚物混凝土的抗氯盐侵蚀性能研究[J].混凝土与水泥制品,2024(3):84-89. TAN Y. Study on chloride corrosion resistance of fly ash based geopolymer Concrete[J].China Concrete and Cement Products,2024(3):84-89.

火山渣粒径和DPS掺量对轻骨料混凝土性能的影响

刘宏波1，2，张少云1，张博洋1，李泳1，常璞1，孙婧1，2，*

2024年第3期

摘要

引用本文

摘要：以火山渣作为粗骨料制备了轻骨料混凝土，研究了火山渣粒径（4.75~9.50、4.75~19.00、4.75~26.00 mm）对轻骨料混凝土坍落度、吸水率和抗压强度的影响，优选出了最佳火山渣粒径。在此基础上，研究了渗透结晶型无机防水剂（DPS）的掺量（0、0.6%、0.8%、1.0%）对轻骨料混凝土性能的影响，并分析了其作用机理。结果表明：随着火山渣粒径的增大，轻骨料混凝土的坍落度降低，吸水率增大，抗压强度先增大后减小，最佳火山渣粒径为4.75~19.00 mm；随着DPS掺量的增加，轻骨料混凝土的坍落度和吸水率降低，抗压强度增大；掺入适量DPS可以有效提高混凝土基体的密实度，从而改善混凝土的性能。 Abstract: Lightweight aggregate concrete was prepared by using volcanic slag as coarse aggregates, and the influence of volcanic slag particle size (4.75~9.50、4.75~19.00、4.75~26.00 mm) on the slump, water absorption, and compressive strength of lightweight aggregate concrete was studied, and the optimal volcanic slag particle size was selected. On this basis, the influence of the content of penetrating crystalline inorganic waterproofing agent (DPS) (0, 0.6%, 0.8%, 1.0%) on the performance of lightweight aggregate concrete was studied, and its mechanism of action was analyzed. The results show that as the particle size of volcanic slag increases, the slump of lightweight aggregate concrete decreases, the water absorption rate increases, and the compressive strength first increases and then decreases, and the optimal particle size of volcanic slag is 4.75~19.00 mm. With the increase of DPS content, the slump and the water absorption rate of lightweight aggregate concrete decrease, and the compressive strength increases. Adding an appropriate content of DPS can effectively improve the compactness of the concrete matrix, thereby improving the performance of the concrete.

刘宏波,张少云,张博洋,等.火山渣粒径和DPS掺量对轻骨料混凝土性能的影响[J].混凝土与水泥制品,2024(3):90-92,98. LIU H B,ZHANG S Y,ZHANG B Y,et al.Effect of volcanic slag particle size and DPS content on performance of lightweight aggregate concrete[J].China Concrete and Cement Products,2024(3):90-92,98.

柠檬酸对氯氧镁水泥水化过程及性能的影响

喻俊1，廖国胜1，2，3，陈迎雪1，刘艳玲1，董兴智1，程利力1，廖宜顺1，2，3，*

2024年第3期

摘要

引用本文

摘要：研究了不同掺量（0、0.2%、0.4%、0.6%、0.8%）的柠檬酸对氯氧镁水泥（MOC）凝结时间、抗压强度、电阻率、体积稳定性和耐水性的影响，并通过XRD和SEM分析了其作用机理。结果表明：掺入柠檬酸会延长MOC的凝结时间和水化诱导期，延缓水化进程，降低抗压强度，但能有效改善MOC的体积稳定性和耐水性；掺入柠檬酸会使MOC水化产物5Mg(OH)2·MgCl2·8H2O（相5）的含量增加，晶体形态改变；空白组浸水28 d后，其内部生成了大量片状Mg(OH)2；掺柠檬酸的试件浸水28 d后，其内部疏松多孔的Mg(OH)2较少，大量絮状相5相互搭接，使MOC的内部结构更加致密，耐水性得到提升。 Abstract: The effects of different contents of citric acid (0, 0.2%, 0.4%, 0.6%, 0.8%) on the setting time, compressive strength, electrical resistivity, volume stability, and water resistance of magnesium oxychloride cement(MOC) were studied, and the mechanisms were analyzed by XRD and SEM. The results show that adding citric acid can prolong the setting time and hydration induction period of MOC, delay the hydration process, reduce compressive strength, but effectively improve volume stability and water resistance. The addition of citric acid increases the content of MOC hydration product Mg(OH)2·MgCl2·8H2O (phase 5) and changes its crystal morphology. After being immersed in water for 28 d, a large amount of flaky Mg(OH)2 is generated inside the blank group. After being immersed in water for 28 d, the specimens mixed with citric acid show less loose and porous Mg(OH)2 inside, and a large amount of flocculent phase 5 overlaps with each other, making the internal structure of MOC more dense and improving its water resistance.

喻俊,廖国胜,陈迎雪,等.柠檬酸对氯氧镁水泥水化过程及性能的影响[J].混凝土与水泥制品,2024(3):93-98. YU J,LIAO G S,CHEN Y X,et al.Effect of citric acid on hydration process and performance of magnesium oxychloride cement[J].China Concrete and Cement Products,2024(3):93-98.

搅拌站废浆对砂浆流动度和力学性能的影响

孙浩，于林玉，刘万刚

2024年第3期

摘要

引用本文

摘要：为了实现搅拌站废浆的再利用，研究了不同含固量（3%~15%）废浆等质量取代0~100%的水对砂浆流动度及力学性能的影响。结果表明：废浆中存在的C3S、C2S等矿物成分使其具备在混凝土中应用的可行性；随着废浆掺量的增加，砂浆的流动度基本呈减小趋势；废浆的掺入能在一定程度上使砂浆的微观结构更密实，从而提高砂浆的力学性能，尤其是28 d抗压强度。 Abstract: In order to realize the reuse of waste slurry from mixing plants, the effects of replacing 0~100% water by waste slurry with different solid content (3%~15%) on the fluidity and mechanical properties of mortar were investigated. The results show that the existence of C3S, C2S and other mineral components in the waste slurry makes it feasible to be applied in concrete. With the increase of the replacement rate of waste slurry, the fluidity of mortar basically shows a decreasing trend. The incorporation of waste slurry can make the microstructure of mortar denser to a certain extent, so as to improve the mechanical properties of the mortar, especially the 28 d compressive strength.

孙浩,于林玉,刘万刚.搅拌站废浆对砂浆流动度和力学性能的影响[J].混凝土与水泥制品,2024(3):99-102. SUN H,YU L Y,LIU W G.Effect of waste slurry from mixing plant on fluidity and mechanical properties of mortar[J].China Concrete and Cement Products,2024(3):99-102.

江阴靖江长江隧道现浇大体积混凝土的抗裂技术与应用

徐思睿1，王晓琼2，3，吴烁2，3，李明1，杨睿1，王文彬1

2024年第3期

摘要

引用本文

摘要：在原材料优选和配合比优化的基础上，通过协同调控水化速率与膨胀历程，设计制备了低温升高抗裂混凝土（M0不掺抗裂剂、M1和M2掺抗裂剂），对比研究了其力学性能、绝热温升和自生体积变形。在此基础上，依托江阴靖江长江隧道现浇大体积C40混凝土工程，采用基于水化-温度-湿度-约束多场耦合机制的收缩模型对该工程不同结构部位的开裂风险进行了定量评估。试验结果表明：掺入适量抗裂剂能有效改善混凝土的绝热温升和自生体积变形，且对抗压强度影响不大。开裂风险评估计算结果表明：底板、侧墙可选择M1配合比，并控制入模温度不大于28 ℃，同时在侧墙中心布置冷却水管；顶板可选择M2配合比，并控制倒角处和其他部位的入模温度分别不大于28 ℃和32 ℃。工程现场持续跟踪监测6个月，未发现混凝土出现开裂、渗漏，达到预期目标。 Abstract: On the basis of optimizing raw materials and mix proportions, low-temperature rise and crack-resistant concrete(M0 without anti-cracking agents, M1 and M2 with anti-cracking agents) was designed and prepared by synergistically regulating the hydration rate and expansion process, and the mechanical properties, adiabatic temperature rise, and autogenous volume deformation were compared and studied. On this basis, relying on the cast-in-situ C40 mass concrete engineering in the Jiangyin Jingjiang Yangtze River Tunnel, a shrinkage model based on the coupling mechanism of hydration-temperature-humidity-constraints was used to quantitatively evaluate the cracking risk of different structure parts of the engineering. The experimental results show that adding an appropriate content of anti-cracking agents can effectively improve the adiabatic temperature rise and autogenous volume deformation of concrete, and has little effect on compressive strength. The calculation results of cracking risk assessment indicate that M1 mix proportion can be selected for the bottom plate and the side wall, and the molding temperature should not exceed 28 ℃, and at the same time, a cooling water pipe should be arranged in the center of the side wall. The top plate can choose the M2 mix proportion and control the molding temperature at the chamfer and other parts to not exceed 28 ℃ and 32 ℃, respectively. Continuously tracking for 6 months, it is found that the concrete do not crack or leak, achieving the expected goal.

徐思睿,王晓琼,吴烁,等.江阴靖江长江隧道现浇大体积混凝土的抗裂技术与应用[J].混凝土与水泥制品,2024(3):74-78. XU S R,WANG X Q,WU S,et al.Anti-cracking technology and application of cast-in-situ mass concrete in Jiangyin Jingjiang Yangtze River Tunnel[J].China Concrete and Cement Products,2024(3):74-78.

盾构泥对加气混凝土性能的影响研究

刘涛，张阿瑶，杨萍，华靖文

2024年第3期

摘要

引用本文

摘要：研究了不同掺量盾构泥等质量取代硅砂对加气混凝土发气时间、硬化时间、外观颜色、抗压强度和干表观密度的影响。结果表明：SiO2含量不低于45%的盾构泥可替代部分硅砂用于生产加气混凝土；一定掺量范围内，随着盾构泥掺量的增加，加气混凝土坯体的发气时间、硬化时间均变长，抗压强度降低；盾构泥的掺加会导致加气混凝土制品外观颜色变深；为确保加气混凝土制品的物理力学性能，需控制盾构泥的掺量。 Abstract: The effects of different contents of shield tunneling mud for equal mass silica sand on the aeration time, hardening time, appearance color, compressive strength, and dry apparent density of aerated concrete were studied. The results show that shield tunneling mud with a SiO2 content of no less than 45% can replace silica sand to produce the aerated concrete. Within a certain content range, as the content of shield tunneling mud increases, the aeration time and hardening time of the aerated concrete embryo become longer, and the compressive strength decreases. The addition of shield tunneling mud can cause the appearance color of aerated concrete products be darker. To ensure the physical and mechanical properties of aerated concrete products, it is necessary to control the content of shield tunneling mud.

刘涛,张阿瑶,杨萍,等.盾构泥对加气混凝土性能的影响研究[J].混凝土与水泥制品,2024(3):66-68. LIU T,ZHANG A Y,YANG P,et al.Research on the influence of shield tunneling mud on the performance of aerated concrete[J].China Concrete and Cement Products,2024(3):66-68.

浆体流变性对透水型泡沫混凝土性能的影响

凌建祥1，董波1，叶焕2，*

2024年第3期

摘要

引用本文

摘要：为提高透水型泡沫混凝土的透水能力、蓄水能力，研究了浆体流变性能对该类混凝土孔结构、透水性、蓄水性的影响。结果表明：当浆体的初始屈服应力小于3.0 Pa时，透水型泡沫混凝土易发生塌模；随着浆体屈服应力与黏度的增大，透水型泡沫混凝土的透水性和蓄水性降低；通过控制浆体的流变性，可以制备出干表观密度700 kg/m3、透水性为K2~K3级、体积蓄水率40%的透水型泡沫混凝土。 Abstract: To improve the water permeability and water storage capacity of pervious foamed concrete, the effects of rheological property of paste on the pore structure, water permeability and water storage properties of pervious foamed concrete were studied. The results show that the foamed concrete is prone to collapse when the initial yield stress is less than 3.0 Pa. The increase of yield stress and viscosity reduces the water permeability and water retention of pervious foamed concrete. A pervious foamed concrete with a dry apparent density of 700 kg/m3, a water permeability of K2~K3, and a volume water retention rate of 40% can be prepared by controlling the rheology of the paste.

凌建祥,董波,叶焕.浆体流变性对透水型泡沫混凝土性能的影响[J].混凝土与水泥制品,2024(3):69-73. LING J X,DONG B,YE H.Effect of rheological properties on the properties of pervious foamed concrete[J].China Concrete and Cement Products,2024(3):69-73.

耐碱玻纤的优选及其对高性能混凝土性能的影响

张立力1，杨婷丽1，李宏伟2，曹鑫铖1，夏如茜1，潘从玲1

2024年第3期

摘要

引用本文

摘要：通过碱溶液浸泡和胶砂强度试验，从8种耐碱玻纤中优选出了1种综合性能相对较好的耐碱玻纤，在此基础上，研究了耐碱玻纤的体积掺量（0、0.05%、0.10%、0.20%、0.40%、0.80%）和养护制度（蒸汽养护56 h、标准养护7 d）对C80、C95高性能混凝土工作性和力学性能的影响。结果表明：TS耐碱玻纤在碱溶液中浸泡96 h后表面无裂痕，且掺TS耐碱玻纤胶砂的28 d抗折、抗压强度相对较高；随着TS耐碱玻纤掺量的增加，C80、C95混凝土的工作性和抗压强度下降，抗折强度基本呈增大趋势；蒸汽养护试件的抗压、抗折强度比标准养护试件的高。 Abstract: Through alkaline solution immersion and mortar strength tests, one alkali resistant glass fiber with relatively good comprehensive performance was selected from eight types of alkali resistant glass fiber. Based on this, the effects of the volume content (0, 0.05%, 0.10%, 0.20%, 0.40%, 0.80%) of alkali resistant glass fiber and curing system (steam curing for 56 h and standard curing for 7 d) on the workability and mechanical properties of C80 and C95 high performance concrete were studied. The results show that there are no cracks on the surface of TS alkali resistant glass fiber after soaking in alkaline solution for 96 h, and the 28 d flexural and compressive strength of mortar with TS alkali resistant glass fiber are relatively high. With the increase of TS alkali resistant glass fiber content, the workability and compressive strength of C80 and C95 concrete decrease, while the flexural strength basically shows an increasing trend. The compressive and flexural strength of steam cured specimens are higher than those of standard cured specimens.

张立力，杨婷丽，李宏伟，耐碱玻纤的优选及其对高性能混凝土性能的影响[J].混凝土与水泥制品,2024(3):49-52. ZHANG L L,YANG T L,LI H W,et al.Optimization of alkali resistant glass fiber and its influence on performance of high performance concrete[J].China Concrete and Cement Products,2024(3):49-52.

聚丙烯纤维橡胶混凝土的力学及抗冻性能研究

苏有文，杨戟*，吕雄飞

2024年第3期

摘要

引用本文

摘要：研究了聚丙烯纤维的体积掺量（0.45%、0.90%、1.35%、1.80%、2.25%、3.41%、4.51%）对橡胶混凝土力学及抗冻性能的影响，并建立了冻融损伤劣化模型来预测橡胶混凝土的冻融损伤劣化规律。结果表明：掺入适量聚丙烯纤维可以有效提高橡胶混凝土的力学及抗冻性能，当聚丙烯纤维掺量在1.80%~2.25%范围内时，试件的力学及抗冻性能均较好；建立的冻融损伤劣化模型的拟合系数R2均大于0.992，拟合精度较高，可为聚丙烯纤维橡胶混凝土在寒冷地区工程中的应用提供理论依据。 Abstract: The effect of volume content of polypropylene fiber (0.45%, 0.90%, 1.35%, 1.80%, 2.25%, 3.41%, 4.51%) on the mechanical properties and frost resistance of rubber concrete was investigated, and a freeze-thaw damage deterioration model was established to predict the freeze-thaw damage deterioration law of rubber concrete in freeze-thaw environment. The results show that an appropriate content of polypropylene fiber can significantly improve the mechanical properties and frost resistance of rubber concrete, and the mechanical properties and frost resistance of rubber concrete are better when the content of polypropylene fiber is 1.80%~2.25%. The fitting coefficients R2 of the established freeze-thaw damage deterioration model is more than 0.992, and the fitting accuracy is high, which can provide theoretical basis for the application of polypropylene fiber rubber concrete in cold region engineering.

苏有文,杨戟,吕雄飞.聚丙烯纤维橡胶混凝土的力学及抗冻性能研究[J].混凝土与水泥制品,2024(3):53-56,61. SU Y W,YANG J,LYU X F.Study on mechanical properties and frost resistance of polypropylene fiber rubber concrete[J].China Concrete and Cement Products,2024(3):53-56,61.

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