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

透水混凝土强度与透水系数关系模型研究

曲广雷1，2，常广利2，王显利2，李梓赫3，刘浩宇3，孙祥涛2，李欣2

2022年第2期

摘要

引用本文

摘要：为建立透水混凝土抗压强度与透水系数的定量关系模型，制备了透水混凝土试件，并测试了试件的有效孔隙率、透水系数和28 d抗压强度。结合现有模型，建立了基于Griffith断裂理论的数学关系模型，并验证了模型的有效性；基于本文提出的模型，选取合适参数，可以对透水混凝土性能进行有效预测。 Abstract: In order to establish a quantitative relationship model between the compressive strength and the permeable coefficient of pervious concrete, pervious concrete specimens were prepared through laboratory tests, and the effective porosity, permeable coefficient and 28 d compressive strength were measured. Combined with the existing model, the mathematical relation model based on Griffith fracture theory was established and the validity of the model was verified. Based on the model proposed in this article, selecting appropriate parameters can effectively predict the performance of pervious concrete.

曲广雷,常广利,王显利,等.透水混凝土强度与透水系数关系模型研究[J].混凝土与水泥制品,2022(2):22-26. QU G L,CHANG G L,WANG X L,et al.Study on the Relationship Model Between Pervious Concrete Strength and Pervious Coefficient[J].China Concrete and Cement Products,2022(2):22-26.

珊瑚混凝土的尺寸效应及损伤破坏特征研究

郭德豪1，张妍2，周聪3，黄玉荣4，尚致晨5

2022年第1期

摘要

引用本文

摘要：利用MTS试验系统，研究了珊瑚混凝土的早期强度增长规律、单轴压缩强度的尺寸效应、破坏模式以及损伤演化特征。结果表明：海水拌制的珊瑚混凝土具有明显的早强特点，养护3 d和7 d试件的相对强度分别可达到0.84和0.90；高径比（长宽比）对试件的单轴压缩强度有较大影响，高径比（长宽比）越大，试件的峰值强度越大，残余强度越小，且表现出显著的脆性破坏特征；单轴压缩条件下，珊瑚混凝土的破坏模式以张拉破坏为主，其破坏形态为断裂裂纹贯穿骨料破坏；借助声发射系统，监测到声发射振铃数与试件的宏观力学性能紧密相关。 Abstract: The MTS test system was utilized to study the early strength growth law, size effect of uniaxial compression strength, failure mode and damage evolution of coral aggregate concrete. The results show that coral aggregate concrete mixed by seawater has obvious characteristics of early strength and its relative strength after curing 3 d and 7 d can reach 0.84 and 0.90 respectively. The uniaxial compressive strength of specimens is significantly affected by height-diameter ratio(length-width ratio). The higher the height-diameter ratio(length-width ratio) is, the higher the peak strength is and the smaller the residual strength is, showing a significant brittle failure characteristic. Under uniaxial compression, the main failure mode of coral aggregate concrete is tensile failure and its fracture surface runs through the aggregate. With the aid of the acoustic emission system, the number of acoustic emission ringing is closely related to the macro-mechanical properties of the specimen.

郭德豪,张妍,周聪,等.珊瑚混凝土的尺寸效应及损伤破坏特征研究[J].混凝土与水泥制品,2022(1):33-37. GUO D H,ZHANG Y,ZHOU C,et al.Study on Size Effect and Failure Characteristics of Coral Aggregate Concrete[J].China Concrete and Cement Products,2022(1):33-37.

基于细观模型的混凝土力学性能研究进展

程想，曹俊鑫，王玲玲，赵银霜，孔德文

2022年第1期

摘要

引用本文

摘要：通过细观模型预测方法建立了混凝土骨料特性与宏观力学性能的联系，可实现混凝土力学性能的预测。归纳了混凝土细观模型的主要结构形式及建模方法，总结了骨料体积率、形状、粒径尺寸等对混凝土静、动态力学性能的影响规律，阐述了骨料体积率、分布形式、粒径尺寸等因素对混凝土强度与弹性模量的影响程度。提出了细观模型预测混凝土宏观力学性能研究中待解决的问题。 Abstract: The relationship between the properties of concrete aggregates and the macro-mechanical properties is established through the meso-model prediction method, which can realize the prediction of the concrete mechanical properties. The main structural forms and modeling methods of the concrete meso-model are summarized, and the influence laws of aggregate volume rate, shape, particle size on the static and dynamic mechanical properties of concrete are summarized, and the influence degree of aggregate volume rate, distribution form, and particle size on the strength and elastic modulus of concrete are described. The problems to be solved in the study of the meso-model predicting the macro-mechanical properties of concrete are put forward.

程想,曹俊鑫,王玲玲,等.基于细观模型的混凝土力学性能研究进展[J].混凝土与水泥制品,2022(1):27-32,37. CHENG X,CAO J X,WANG L L,et al.Research Progress in Mechanical Properties of Concrete Based on the Mesoscopic Model[J].China Concrete and Cement Products,2022(1):27-32,37.

低温环境下石灰岩机制砂砂浆抗硫酸盐侵蚀性能研究

邓俊双1，徐志华1，李北星2，李龙2

2022年第1期

摘要

引用本文

摘要：为研究低温环境下石灰岩机制砂及石粉对混凝土抗硫酸盐侵蚀性能的影响，以掺/未掺石灰岩石粉的机制砂砂浆、掺/未掺石灰岩石粉的天然砂砂浆为模拟对象，结合硫酸盐腐蚀介质及低温环境特点，采用温度（5±1）℃的5%的MgSO4溶液模拟服役环境，对比研究了不同腐蚀龄期（0 d、60 d、90 d、210 d、270 d、360 d）试件的外观和强度变化，并基于XRD、FTIR测试分析了侵蚀产物。结果表明：随着龄期的增长，侵蚀方式由传统的钙矾石型硫酸盐侵蚀逐渐过渡到以碳硫硅酸钙为侵蚀产物的TSA岩侵蚀；石灰岩机制砂和石粉均能促使砂浆产生TSA侵蚀，且石粉的影响更加明显。 Abstract: In order to study the influence of limestone manufactured sand and limestone rock fines on the sulfate resistance of concrete under low temperature environment, the two kinds of manufactured sand mortars mixed with or without limestone rock fines, and the two kinds of natural sand mortars incorporated with or without limestone rock fines were used as the simulate objects. Combined with the characteristics of sulfate corrosion medium and low temperature environment, 5% magnesium sulfate solution at (5±1)℃ was used to simulate the service environment. The changes of appearance and strength for the mortar specimens at different corrosion ages (0 d, 60 d, 90 d, 210 d, 270 d, 360 d) were compared and studied, and the corrosion products were analyzed by X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR). The results show that with the increase of erosion age, the erosion mode gradually transits from traditional ettringite type sulfate attack to thaumasite sulfate attack (TSA) with thaumasite as the erosion product. Limestone manufactured sand and limestone rock fines all can promote the TSA of mortar and concrete, and the effect of limestone rock fines is more obvious.

邓俊双,徐志华,李北星,等.低温环境下石灰岩机制砂砂浆抗硫酸盐侵蚀性能研究[J].混凝土与水泥制品,2022(1):22-26. DENG J S,XU Z H,LI B X,et al.Sulfate Resistance of Limestone Manufactured Sand Mortar in Low Temperature Environment[J].China Concrete and Cement Products,2022(1):2022(1):22-26.

隧道衬砌混凝土抗溶蚀性能影响因素研究

田钊1,周莹2,3,伍洲1,穆松2,3,张建喜4,刘凯2,3

2022年第1期

摘要

引用本文

摘要：以广东某隧道工程为例，研究了水胶比、矿物掺合料和砂率对混凝土早期抗压强度、抗渗性能、抗氯离子渗透性能和抗溶蚀性能的影响。结果表明：随着水胶比的减小，混凝土早期抗压强度、抗渗性能、抗氯离子渗透性能和抗溶蚀性能均提高；掺入适量的矿物掺合料降低了混凝土的早期抗压强度和抗渗性能，但提高了混凝土的抗氯离子渗透性能和抗溶蚀性能；随着砂率的增加，混凝土的早期抗压强度先降低后提高，抗渗性能、抗氯离子渗透性能、抗溶蚀性能提高，最佳砂率为45%；综合对比得到了各因素对混凝土抗溶蚀性能的提高效果为：水胶比>矿物掺合料>砂率。 Abstract: Taking a tunnel project in Guangdong as an example, the effects of water-binder ratio, mineral admixture and sand ratio on the early compressive strength, impermeability, resistance to chloride ion penetration and corrosion resistance of concrete were studied. The results show that as the water-binder ratio decreases, the early compressive strength, impermeability, resistance to chloride ion penetration and corrosion resistance of concrete all increase. The appropriate addition of mineral admixtures reduces the early compressive strength and impermeability of concrete, but improves the resistance to chloride ion penetration and corrosion resistance of concrete. As the sand ratio increases, the early compressive strength of concrete decreases first and then increases, and the impermeability, resistance to chloride ion penetration, and corrosion resistance are improved. The best sand ratio is 45%. Comprehensive comparison of the effects of various factors on the anti-corrosion performance of concrete is: water-binder ratio>mineral admixture>sand ratio.

田钊,周莹,伍洲,等.隧道衬砌混凝土抗溶蚀性能影响因素研究[J].混凝土与水泥制品,2022(1):17-21. TIAN Z,ZHOU Yi,WU Z,et al.Study on Factors Affecting the Corrosion Resistance Performance of Tunnel Lining Concrete[J].China Concrete and Cement Products,2022(1):17-21.

微珠对隧道工程混凝土性能的影响及机理研究

王涛1，胡琪1，吴绍明2，储洪强1，陈峰2，赵文文1,丁天云1，蒋林华1

2022年第1期

摘要

引用本文

摘要：针对广州新白云国际机场隧道工程建设中大体积混凝土的温度裂缝问题，通过复掺微珠和粉煤灰，研究了微珠掺量对混凝土的力学性能、干燥收缩、水化热以及早期抗裂性能的影响，并采用SEM分析了微珠对水泥水化反应的作用机理。结果表明：当矿物掺合料总量一定时，随着微珠掺量的增加，混凝土的力学性能早期变化较小，后期呈现出先增加后下降的趋势，且微珠掺量为10%时，混凝土养护60 d的抗压强度、劈裂抗拉强度以及弹性模量最高；混凝土干缩率随着微珠掺量的增加而减小，且这种趋势随龄期的增加而增大，当微珠掺量15%时，60 d混凝土的干缩率最小；当微珠掺量为10%时，混凝土早期抗裂性能最佳，平板试件表面24 h内无裂缝；微珠掺量对胶凝材料水化热总量影响较小，但对水化放热峰值及峰值产生时间影响较大；微珠可以加速浆体早期的水化进程，减少硬化浆体的孔隙，使其结构更密实。 Abstract: In order to solve the temperature crack problem of the mass concrete structure in the construction of the Guangzhou New Baiyun International Airport tunnel engineering, the mechanism and effect of microbeads content on the macro-performance of concrete were performed, which specifically includes mechanical properties, dry shrinkage performance, heat hydration and early cracking resistance. Moreover, SEM was used for exploring the influence of microbeads on the hydration of cement. The results show that with the increase of microbeads content, the mechanical properties of concrete present no changes in the early stages, and increases first, then decreases in the later stages when the total content of mineral admixture is unchanged. When microbeads content is 10%, the compressive strength, splitting tensile strength and elastic modulus of concrete at 60 d are the highest. The dry shrinkage rates of concrete decrease with the increase of microbeads content, and the improvement becomes even bigger with the increase of curing age. The dry shrinkage of concrete at 60 d is the smallest when the content of microbeads is 15%. The early cracking resistance of concrete is the best with 10% microbeads, which can be manifested as no obvious cracks on the surface of the flat specimen within 24 h. Microbeads has little impact on the total hydration heat, and has a great influence on the peak and its arrival time of hydration exothermic rate. Microbeads can accelerate the early hydration process of cement and decrease the porosity of cement paste, which can make microstructure denser.

王涛,胡琪,吴绍明,等.微珠对隧道工程混凝土性能的影响及机理研究[J].混凝土与水泥制品,2022(1):12-16,21. WANG Tao, HU Qi, WU Shao-ming,et al.Mechanism and Effect of Microbeads on the Properties of Concrete for the Tunnel Engineering[J].China Concrete and Cement Products,2022(1):12-16,21.

陶砂对3D打印砂浆力学与微观性能的影响

陈传峰，刘晨曦，李思琪，孙传珍，冯竟竟

2022年第1期

摘要

引用本文

摘要：用陶砂部分替代河砂制备了3D打印砂浆，并对该砂浆的流动性、抗压强度以及微观孔结构进行了研究。试验结果表明：砂浆的流动度在170~180 mm时具有良好的可打印性；随陶砂掺量的增加，3D打印砂浆的抗压强度降低，当陶砂的体积掺量为30%时，砂浆试件28 d的抗压强度为14.7 MPa；随着陶砂掺量的增大，砂浆3 d龄期的孔隙率呈现先增大后减小的趋势，其中，陶砂体积掺量为30%时，砂浆的孔隙率最小，此时无害孔和少害孔所占的比例最大。 Abstract: Ceramic sand was used to partially replace river sand, and the fluidity, compressive strength and microscopic pores structure of 3D printed mortar were studied. The test results show that the mortar has good printability when the fluidity is 170~180 mm. With the increase of ceramic sand content, compressive strength of 3D printed mortar decreses. When the volume content of ceramic sand is 30%, the 28 d compressive strength of mortar test block is 14.7 MPa. With the increase of ceramic sand content, the porosity of mortar at 3 d increases first and then decreases. When the volume content of ceramic sand is 30%, the porosity of mortar is the smallest, and the proportion of harmless holes and less harmful holes is the largest.

陈传峰,刘晨曦,李思琪,等.陶砂对 3D 打印砂浆力学与微观性能的影响[J].混凝土与水泥制品,2022(1):7-11. CHEN C F,LIU C X,LI S Q,et al.Influence of Ceramic Sand on Mechanical and Microscopic Properties of 3D Printed Mortar[J].China Concrete and Cement Products,2022(1):7-11.

新拌UHPC净浆的工作性与流变性试验研究

黄静1，季文玉1，阎培渝2

2022年第1期

摘要

引用本文

摘要：通过正交试验研究了水胶比、超细粉煤灰掺量和硅灰掺量对新拌UHPC净浆的工作性与流变性的影响，选取流动度、黏度系数和水膜层厚度为工作性与流变性的衡量指标，利用综合平衡法获得了最优配合比。试验结果表明：水胶比、超细粉煤灰掺量和硅灰掺量的提高都会造成UHPC净浆的流动度和颗粒表面水膜层厚度增大，黏度系数减小；超细粉煤灰掺量是净浆工作性和流变性的主要影响因素，水胶比次之，硅灰掺量的影响最小；UHPC最优配合比：水胶比为0.2，超细粉煤灰掺量为40%，硅灰掺量为8%；以该配合比的成型的UHPC 28 d抗压强度为128.8 MPa，抗拉强度为20.3 MPa，同时满足工作性和力学性能要求，且经济合理。 Abstract: An orthogonality test was carried out for study on the effect of W/C ratio, the superfine fly ash and silica fume content on workability and rheological properties of fresh paste of UHPC, and flow spread, consistency coefficient and water film thickness on particles were taken as the measures of workability and rheological properties. The comprehensive balance method was used to obtain the optimal mix proportion of UHPC. The results show that the increase of W/C ratio, the superfine fly ash and silica fume content of UHPC enhances its water film thickness on particles and flowability, reduces its coefficient of viscosity. The superfine fly ash content is the main factor that affects the workability and rheological properties of UHPC, followed by W/C ratio and silica fume content. The optimal mix proporition of UHPC of the W/C is 0.2, superfine fly ash content of 40% and silica fume content of 8%. The 28 d compressive strength of the UHPC is 128.8 MPa and its flexurary strength is 20.3 MPa. It shows a satisfied workability and mechanical properties, as well as a reasonable economy．

黄静,季文玉,阎培渝.新拌UHPC 净浆的工作性与流变性试验研究[J].混凝土与水泥制品,2022(1):1-6. HUANG J,JI W Y,YAN P Y.Experimental Study on Workability and Rheological Properties of Fresh Paste of UHPC[J].China Concrete and Cement Products,2022(1):1-6.

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