混凝土研究_2022_《混凝土与水泥制品》杂志社

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混凝土研究

天然和人工骨料水工混凝土的配制及性能研究

张桂华1，张丰2

2022年第5期

摘要

引用本文

摘要：分别选择天然砂砾石、花岗岩人工骨料开展了C30、C20水工混凝土配合比设计及性能试验，研究了骨料品种对相同强度等级混凝土拌和物性能、力学性能、绝热温升、耐久性能等方面的影响。结果表明：采用天然骨料或人工骨料，以绝对体积法设计、制备的C20W6F300、C30W6F350混凝土的强度、抗渗等级、抗冻等级均能满足设计指标要求；当强度等级相同时，两种骨料制备的混凝土拌和物性能相近，人工骨料混凝土的力学性能、抗裂性、抗冻性均优于天然骨料混凝土，但天然骨料混凝土的渗水高度小于人工骨料混凝土，C20人工骨料混凝土的绝热温升值略高于天然骨料混凝土，但两者的平均温升值相近。 Abstract: Natural sand gravel and granite artificial aggregates were selected respectively to carry out C30 and C20 hydraulic concrete mix proportion and performance tests, and the influences of aggregate variety on the mixture properties, mechanical properties, adiabatic temperature rise and durability performance of concrete of the same strength grade were studied. The results show that C20W6F300 and C30W6F350 concrete designed and prepared by the absolute volume method using natural aggregates or artificial aggregates can meet the requirements of design technical indicators in terms of strength, impermeability and frost resistance. The properties of the concrete mixture prepared from the 2 aggregates are similar. The mechanical properties and frost resistance of the artificial aggregate concrete are better than those of the natural aggregate concrete, but the water seepage height of the natural aggregate concrete is smaller than that of the artificial aggregate concrete, and the adiabatic temperature rise of artificial aggregate C20 concrete is slightly higher than that of natural aggregate C20 concrete, but the average temperature rise of the two is similar.

张桂华,张丰.天然和人工骨料水工混凝土的配制及性能研究[J].混凝土与水泥制品,2022(5):1 -6,11. ZHANG G H,ZHANG F.Study on Preparation and Properties of Hydraulic Concrete with Natural and Artificial Aggregate[J].China Concrete and Cement Products,2022(5):1 -6,11.

大温差盐渍土环境下矿物掺合料混凝土抗裂性能研究

卢燕1，夏星1，井维东2，王锟1

2022年第5期

摘要

引用本文

摘要：制备了基准组及三组不同掺量的粉煤灰-矿粉混凝土，采用环境试验箱模拟大温差及盐渍土侵蚀环境，研究了混凝土的力学性能和抗裂性能。结果表明：矿物掺合料的掺入降低了混凝土的力学性能，但提高了其力学性能增长速率，还提高了混凝土的抗裂性能；掺15%粉煤灰和20%矿粉的混凝土前期抗压强度增长速率较快，3~14 d的抗压强度平均增长率比基准混凝土高102.46%，28 d的断裂能比普通混凝土高50.67%；含矿物掺合料的混凝土抗折强度增长速率均高于基准混凝土；通过SEM发现，适量矿物掺合料改善了混凝土内部的密实度和孔隙结构，裂缝宽度明显减小。 Abstract: The reference concrete and three kinds of fly ash-slag concrete with different contents were prepared, and their mechanical properties and crack resistance were studied by using an environmental test chamber to simulate the environment of large temperature difference and saline soil erosion. The results show that the addition of mineral admixtures reduces the mechanical properties of concrete, but increases its growth rate and also improves the crack resistance of concrete. The compressive strength growth rate of concrete mixed with 15% fly ash and 20% slag is faster in the early stage. The average growth rate of compressive strength from 3 d to 14 d is 102.46% higher than that of reference concrete, and the fracture energy of 28 d is 50.67% higher than that of reference concrete. The flexural strength growth rate of the three groups of mineral admixture concrete is generally higher than that of reference concrete. It is found by SEM that the appropriate mineral admixture improves the compactness and pore structure inside the concrete, the crack width is significantly reduced.

卢燕,夏星,井维东,等.大温差盐渍土环境下矿物掺合料混凝土抗裂性能研究[J].混凝土与水泥制品,2022(5):7-11. LU Y,XIA X,JING W D,et al.Research on Crack Resistance of Mineral Admixture Concrete Under Large Temperature Difference and Saline Soil Environment[J].China Concrete and Cement Products,2022(5):7-11.

掺合料复掺对清水混凝土性能的影响

盖珂瑜1,2，龙勇1,2，刘俊利1,2，陈露一1,2，李信1,2，黄有强1,2

2022年第5期

摘要

引用本文

摘要：研究了一种黏度改性材料或石灰石粉与矿粉复掺对清水混凝土力学性能、抗渗性能和外观质量的影响。结果表明：用8%的黏度改性材料或15%的石灰石粉与矿粉复掺对提高清水混凝土的抗压强度、降低其电通量和氯离子扩散系数的效果相对较好；复掺黏度改性材料或石灰石粉制备的清水混凝土外观颜色偏亮，表面平整光滑，气泡较少。 Abstract: The effects of dosage of viscosity-modified material and limestone powder on mechanical properties, impermeability and appearance of fair-faced concrete with mineral powder were studied. The results show that 8% of viscosity modifier or 15% of limestone powder and mineral powder have relatively good effects on improving the compressive strength of fair-faced concrete and reducing its electric flux and chloride ion diffusion coefficient. The fair-faced concrete prepared by adding viscosity modified material or limestone powder has a brighter appearance, smooth surface and less air bubbles.

盖珂瑜,龙勇,刘俊利,等.掺合料复掺对清水混凝土性能的影响[J].混凝土与水泥制品,2022(5):12-16. GE K Y,LONG Y,LIU J L,et al.Effects of Admixtures on the Properties of Fair-faced Concrete[J].China Concrete and Cement Products,2022(5):12-16.

晶核型早强剂在低温条件下的水化促进作用

冯燕芳1，王伟山2,3，郑柏存1

2022年第5期

摘要

引用本文

摘要：研究了三种低温（-3 ℃、0 ℃和5 ℃）环境下晶核型早强剂对水泥凝结硬化行为的影响，采用TG、XRD、SEM进行了表征，并对其机理进行了分析。结果表明，在低温条件下，晶核型早强剂可以加快水泥水化进程，提高硬化浆体的致密程度，有效缩短水泥凝结时间并提升其早期强度的发展。 Abstract: The influence of crystal nucleus based accelerator on setting and hardening behaviors of cement in three low temperature environments(-3 ℃, 0 ℃ and 5 ℃) was investigated, the mechanism was characterized and analyzed by TG, XRD, SEM. The results show that the hydration process of cement can be accelerated by crystal nucleus based accelerator, densification of hardened paste is improved, the setting time of cement is effectively shorten and its early strength development is enhanced.

冯燕芳,王伟山,郑柏存.晶核型早强剂在低温条件下的水化促进作用[J].混凝土与水泥制品,2022(5):17-20,25. FENG Y F,WANG W S,ZHENG B C.Hydration Process on Crystal Nucleus Based Accelerator Under Low Temperature Environments[J].China Concrete and Cement Products,2022(5):17-20,25.

机制砂成分对隧道混凝土抗硫酸盐侵蚀性能的影响

何柳

2022年第5期

摘要

引用本文

摘要：基于机制砂混凝土在隧道工程服役过程中出现的侵蚀破坏现象，采用相同的原材料、配合比进行混凝土加速侵蚀试验，研究了机制砂成分对隧道混凝土抗硫酸盐侵蚀性能的影响。结果表明，含有石膏矿物相且石粉含量较多的机制砂制备出的砂浆试件，在低温环境下发生了硫酸盐侵蚀破坏。因此，在低温环境下使用机制砂作为隧道混凝土细骨料时，必须检验并控制其成分，防止其对混凝土的耐久性带来不利影响。 Abstract: Based on the erosion and damage phenomenon of machine-made sand concrete in the service process of tunnel engineering, the accelerated erosion test of concrete was carried out with the same raw materials and mix proportion, and the influence of the compositions of machine-made sand on the sulfate corrosion resistance of tunnel concrete was studied. The results show that the mortar specimens prepared from machine-made sand containing gypsum mineral phase and high content of stone powder suffer sulfate erosion damage at low ambient temperature. Therefore, when machine-made sand is used as tunnel concrete fine aggregate in a low temperature environment, its composition must be inspected and controlled to prevent it from adversely affecting the durability of concrete.

何柳.机制砂成分对隧道混凝土抗硫酸盐侵蚀性能的影响[J].混凝土与水泥制品,2022(5):21-25. HE L.Effect of the Compositions of Machine-made Sand on the Sulfate Resistance of the Tunnel Concrete[J].China Concrete and Cement Products,2022(5):21-25.

机制砂超高性能混凝土（UHPC）试验研究

王全超1,2，周玉娟3，占文1,2，秦明强1,2，杨林1,2，黄玉良3

2022年第5期

摘要

引用本文

摘要：为配制经济型超高性能混凝土（UHPC)，在标准养护制度下，采用机制砂取代石英砂，研究了机制砂细度及其级配对UHPC性能的影响，并结合扫描电子显微镜（SEM）分析其高强机理。结果表明：采用合理级配机制砂可显著提高UHPC试件的工作性及力学性能，并可制备出扩展度为680 mm，28 d最大抗折、抗压强度分别为25.8 MPa、135.6 MPa的机制砂UHPC；机制砂、钢纤维与水泥石基体结合紧密，且钢纤维在水泥石基体中均匀分布，使UHPC试件具有优异的力学性能。 Abstract: In order to prepare economical ultra-high performance concrete (UHPC), the quartz sand was replaced by mechanical sand. The influence of mechanical sand fineness and its gradation on the performance of UHPC was studied under standard curing. Additionally, the high strength mechanism was further clarified through SEM micro-morphology analysis. The results show that the working performance and mechanical properties of the UHPC samples can be significantly improved with reasonable gradation of mechanical sand. The UHPC samples with an expansion of 680 mm and the 28 d maximum flexural strength and compressive strength of 25.8 MPa and 135.6 MPa can be prepared by mixing mechanical sand. The reason is that mechanical sand and steel fibers are tightly combined with the cement paste matrix, and the steel fibers are uniformly distributed in the cement paste matrix. The uniform and dense structure makes the samples have excellent properties.

王全超,周玉娟,占文,等.机制砂超高性能混凝土（UHPC）试验研究[J].混凝土与水泥制品,2022(5):26-29,45. WANG Q C,ZHOU Y J,ZHAN W,et al.Study on Ultra-high Performance Concrete(UHPC) with Mechanism Sand[J].China Concrete and Cement Products,2022(5):26-29,45.

不同因素对透水混凝土性能的影响

周家慧，杨建永，李钧

2022年第5期

摘要

引用本文

摘要：基于正交试验研究了粗骨料占比、浆膜厚度、水胶比及硅灰替代率四种因素对透水混凝土抗压强度及透水系数的影响。结果表明：浆膜厚度对透水混凝土抗压强度及透水系数的影响最大；随着粗骨料占比的增加，透水混凝土的抗压强度降低，透水系数先增后减；随着浆膜厚度的增加，透水混凝土的抗压强度增加，透水系数降低；随着水胶比的增加，透水混凝土的抗压强度先增后减，透水系数波动变化；随着硅灰替代率的增加，透水混凝土的抗压强度总体呈增大趋势，透水系数降低；通过优选得到抗压强度最优组的透水混凝土抗压强度为35.1 MPa、透水系数为1.8 mm/s，可应用于轻型荷载道路；透水系数最优组的透水混凝土抗压强度为26.7 MPa、透水系数为3.6 mm/s，可应用于人行道、非机动车道等。 Abstract: Through the orthogonal experiment design method, the influence of four factors, the proportion of coarse aggregate, the thickness of the grout, the water-binder ratio and the replacement rate of silica fume on the compressive strength and water permeability coefficient of pervious concrete was studied. The results show that the thickness of the grout has the greatest influence on the compressive strength and permeability coefficient of the pervious concrete. As the proportion of coarse aggregate increases, the compressive strength of pervious concrete decreases, and the permeability coefficient first increases and then decreases. As the thickness of the grout increases, the compressive strength of pervious concrete increases and the permeability coefficient decreases. As the water-binder ratio increases, the compressive strength of pervious concrete first increases and then decreases, and the permeable coefficient fluctuates. As the replacement rate of silica fume increases, the compressive strength of pervious concrete generally shows an increasing trend, while the permeable coefficient decreases. Through the test of the two optimal combinations, it is obtained that the compressive strength of the pervious concrete with the best compressive strength is 35.1 MPa and the water permeability coefficient is 1.8 mm/s, which can be applied to light-loaded roads. The compressive strength of the pervious concrete with the optimal combination of permeability coefficient is 26.7 MPa and the permeability coefficient is 3.6 mm/s, which can be applied to sidewalks, non-motorized roads, etc.

周家慧,杨建永,李钧.不同因素对透水混凝土性能的影响[J].混凝土与水泥制品,2022(5):30-35. ZHOU J H,YANG J Y,LI J.The Influence of Different Factors on the Performance of Pervious Concrete[J].China Concrete and Cement Products,2022(5):30-35.

改性纳米CaCO3对水泥基复合材料性能的影响

李倩茹，杜红秀

2022年第5期

摘要

引用本文

摘要：采用乙烯醋酸乙烯酯可再分散乳胶粉(EVA)对纳米CaCO3颗粒进行改性，并用吸光光度法分析其分散效果。掺入浓度为5%~20%的EVA溶液和1.0%~2.5%的纳米CaCO3制备了水泥基复合材料试件（NCC），研究了改性纳米CaCO3对NCC抗压强度的影响，并用SEM对NCC微观结构进行了表征。结果表明：EVA溶液对纳米CaCO3具有良好的分散作用；纳米CaCO3掺量相同时，EVA溶液浓度越大，减水剂掺量越少；当EVA水溶液的浓度为15%，纳米CaCO3掺量为胶凝材料质量的2.0%时，NCC各龄期的抗压强度最高，表面孔隙较少。 Abstract: The nano-CaCO3 powder was modified by ethylene-vinyl acetate redispersible latex powder (EVA), and its dispersion effect was analyzed by absorptiometry. The cement-based composite specimens(NCC) were prepared by adding EVA aqueous solution with a concentration of 5%~20% and 1.0%~2.5% nano-CaCO3, and the effect of modified nano-CaCO3 on the compressive strength of NCC was studied, and the microstructure of NCC was characterized by SEM. The results show that the EVA aqueous solution has a good dispersing effect on the nano-CaCO3. When the content of nano-CaCO3 is the same, the greater the concentration of EVA solution, the less the content of water reducing agent. When the concentration of EVA aqueous solution is 15%, and the content of nano-CaCO3 is 2.0% of the mass of the cementitious material, the compressive strength of NCC is higher than that of the control group, and the surface pores are less.

李倩茹,杜红秀.改性纳米CaCO3对水泥基复合材料性能的影响[J].混凝土与水泥制品,2022(5):34-37. LI Q R,DU H X.Influence of Modified Nano-CaCO3 on the Properties of Cement-based Composites[J].China Concrete and Cement Products,2022(5):34-37.

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