混凝土研究_2021_《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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混凝土研究

珊瑚砂和玻璃微珠制备超高性能混凝土的试验研究

胡尧1，陈飞翔2,3,4，张国志2,3,4，陈尚雷2,3,4，杨荣辉2,3,4

2021年第2期

摘要

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摘要：采用珊瑚砂、空心玻璃微珠两种轻质材料等比例取代石英砂制备了超高性能混凝土（UHPC），并对其表观密度和力学性能进行了研究。试验结果表明：珊瑚砂经过预处理后可以取代石英砂制备UHPC，表观密度降低了10.5%；空心玻璃微珠取代10%的石英砂制备的UHPC表观密度降低了11.5%；将珊瑚砂与空心玻璃微珠复合作为骨料制备出的UHPC表观密度降低了20.2%。 Abstract: Lightweight ultra-high performance concrete was prepared by replacing the quartz sand with two kinds of lightweight materials: coral reef sand and hollow glass microsphere. The test results show that after pretreatment, coral reef sand can replace quartz sand to produce ultra-high performance concrete, and the bulk density is reduced by 10.5%. Hollow glass microspheres replace 10% quartz sand to produce ultra-high performance concrete, and the bulk density is reduced by 11.5%. At the same time, the combination of coral reef sand and hollow glass microsphere as aggregates can also be used to prepare ultra-high performance concrete, and the bulk density is reduced by 20.2%.

胡尧,陈飞翔,张国志,等.珊瑚砂和玻璃微珠制备超高性能混凝土的试验研究[J].混凝土与水泥制品,2021(2):1-4. HU Y,CHEN F X,ZHANG G Z,et al.Experimental Study on Preparation of Ultra-high Performance Concrete with Coral Reef Sand and Glass Microsphere[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):1-4.

减缩型聚羧酸系减水剂SRPC-7的合成与性能研究

李崇智，曹莹莹，牛振山，吴慧华

2021年第2期

摘要

引用本文

摘要：合成了马来酸二乙二醇单丁醚的酯类单体，将其与甲基烯丙基聚乙二醇和丙烯酸（AA）、甲基丙烯磺酸钠（MAS）、过硫酸铵（APS）等共聚成一种具有良好分散性与保坍能力的减缩型聚羧酸系减水剂SRPC-7。结果表明：2.0%的SRPC-7溶液表面张力为35.2 mN/m，低于普通聚羧酸系减水剂PC的表面张力（53.9 mN/m）；掺两种聚羧酸减水剂的砂浆与混凝土试件收缩率均低于空白组，掺SRPC-7的砂浆试件28 d收缩率下降了39.5%，掺SRPC-7的混凝土试件28 d收缩率比为55.4%，SRPC-7有利于提高混凝土的抗收缩开裂性能。 Abstract: The ester monomer of maleic acid diethylene glycol monobutyl ether was synthesized, and it was combined with methallyl polyethylene glycol, acrylic acid(AA), sodium methacrylate sulfonate(MAS), ammonium persulfate(APS) and other copolymerization into a shrinkage reducing polycarboxylate superplasticizer SRPC-7, which had good dispersibility and slump retention ability. The results show that the surface tension of the 2.0% SRPC-7 solution is 35.2 mN/m, which is far lower than the 53.9 mN/m of polycarboxylate superplasticizer PC. The shrinkage of the mortar and concrete mixed with PC is lower than that of the blank sample. The 28 d shrinkage rate of the cement mortar test block mixed with SRPC-7 decreases by 39.5%, and the 28 d shrinkage ratio of the concrete mixed with SRPC-7 is 55.4% of the blank group, which is conducive to the shrinkage and cracking resistance of concrete.

李崇智,曹莹莹,牛振山,等.减缩型聚羧酸系减水剂SRPC-7的合成与性能研究[J].混凝土与水泥制品,2021(2):5-7,12. LI C Z,CAO Y Y,NIU Z S,et al.Study on Synthesis and Properties of Shrinkage Reducing Polycarboxylate Superplasticizer SRPC-7[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):5-7,12.

高流动性3D打印水泥基材料制备及性能研究

魏玮1，杨涛2

2021年第2期

摘要

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摘要：为了制备性能良好的3D打印胶凝材料，用碱激发剂对粉煤灰/矿渣胶凝材料进行激发得到了满足可打印性和力学性能的基础材料，并分析了影响胶凝材料性能的最主要因素，基于微观试验结果分析了粉煤灰和碱激发剂对胶凝材料性能的影响机理。结果表明：基础材料的合适掺量和组成为：粉煤灰30%、碱胶比0.56%、碱含量5%、激发剂模数1.0；宜选用CaO含量适中的矿渣，激发剂静置时间应为48 h；影响胶凝材料流动性和力学性能的最主要因素为碱含量；相比于纯矿渣胶凝材料，粉煤灰的掺入使材料表面出现微裂缝，使其强度降低，而碱激发剂的掺入，增强了胶凝材料的密实性，提高了强度。 Abstract: In order to prepare 3D printed cementitious materials with good properties, fly ash/slag cementitious materials were excited by alkali activator, the composition of basic materials satisfying the printability and mechanical properties was obtained, and the main factors affecting the properties of cementitious materials were analyzed. The influence mechanism of fly ash and alkali activator on the properties of cementitious materials was analyzed by microcosmic experiment. The results show that the proper content and composition of the basic materials are as follows: fly ash 30%, ratio of alkali activator soultion to cementitious material 0.56%, alkali content 5%, activator modulus 1.0. The slag with moderate CaO content should be selected and the static time of the activator should be 48 h. The alkali content is the most important factor that affects the fluidity and mechanical properties of cementitious materials. Compared with the pure slag cementitious material, the addition of fly ash causes the micro-cracks on the surface of the material and reduces its strength, while the addition of alkali activator enhances the compactness and strength of the cementitious material.

魏玮,杨涛.高流动性3D打印水泥基材料制备及性能研究[J].混凝土与水泥制品,2021(2):8-12. WEI W,YANG T.Study on Preparation and Properties of High Fluidity 3D Printed Cement-based Materials[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):8-12.

饱和泥浆法透水混凝土抗堵性试验研究

史俊礼1，蔡基伟1，高国防2，付万长1，周奕菡1，王显1

2021年第2期

摘要

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摘要：以表观填隙系数为主要控制指标制备了不同强度等级的透水混凝土，分析了透水指标与连通孔隙率的关系。采用黄泛区粉土饱和泥浆作为堵塞介质，测定了预定次数堵塞(淋泥-晾干)循环后的各项透水指标，评价了饱和泥浆对透水混凝土抗堵塞性能的影响。结果表明：透水混凝土各项透水指标与连通孔隙率密切相关；当体系水灰（胶）比为0.24、表观填隙系数为0.70、高性能减水剂掺量适当时，透水混凝土抗压强度达到最高（28.3 MPa）且不积浆；经过堵塞循环后，透水混凝土的透水性下降明显，与掺减水剂试样相比，未掺减水剂试样的透水性损失速度快；初始连通孔隙率为10.5%的透水混凝土，经受近30次饱和泥浆的堵塞循环后，透水系数基本衰减到相关规程规定的下限值以下。 Abstract: The samples were prepared by controlling apparent paste-void ratio in pervious concrete, and the relation of permeable parameters to continuous porosity was analyzed. The saturated slurry made of silt in Yellow River Flood Area played a role of clogging medium. The permeable parameters were measured after the samples suffered scheduled clogging (slurry sprinkling - air drying) cycles to evaluate the effect of saturated slurry on resistance of pervious concrete to clogging. The results reveal that the permeable parameters of pervious concrete are closely related to its continuous porosity. The pervious concrete with the highest strength (28.3 MPa) and without paste flow can be prepared with water-cement (binder) ratio of 0.24, proper dosage of superplasticizer and in apparent paste-void ratio of approximate 0.70. The permeability of pervious concrete obviously reduces after clogging cycles. The permeability of pervious concrete samples without superplasticizer generally loses faster than that of samples with superplasticizer. For the pervious concrete with initial continuous porosity of 10.5%, its coefficient of permeability decreases to less than minimum value defined by related specification after nearly 30 clogging cycles.

史俊礼,蔡基伟,高国防,等.饱和泥浆法透水混凝土抗堵性试验研究[J].混凝土与水泥制品,2021(2):13-17,22. SHI J L,CAI J W,GAO G F,et al.Experimental Study on Resistance to Clogging of Pervious Concrete by Saturated Slurry Method[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):13-17,22.

粉煤灰对淡化海砂混凝土性能的影响

鲍聪1，梁超锋1,2，占海华1,3，费洗非4，侯少丹2，郭伟4

2021年第2期

摘要

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摘要：选取两种不同来源的粉煤灰（FAⅠ、FAⅡ），研究了其品质差异和掺量（0、15%、30%、45%）及水胶比（0.5、0.4、0.3）对淡化海砂混凝土工作性、力学性能和耐久性能的影响。研究表明：相较于FAⅡ，FAⅠ型粉煤灰的需水量更小，采用较少的减水剂能使新拌混凝土具有良好的工作性；在水胶比相同的情况下，FAⅠ型粉煤灰对混凝土后期强度发展有更加积极的影响；随着粉煤灰掺量的增加，淡化海砂混凝土的电通量值均先减小后增大，且FAⅠ型粉煤灰对改善混凝土抗Cl-渗透性能更优；随着龄期增长，三种水胶比下FAⅡ型粉煤灰掺量不宜高于15%，而水胶比为0.4和0.3时，FAⅠ型粉煤灰最大掺量可达30%~45%。 Abstract: The influence of two different fly ash FAⅠ, FAⅡand their replacement ratio (0, 15%, 30%, 45%), different water-binder ratio (0.5、0.4、0.3) on the workability, mechanical properties and durability of desalted sea sand concrete was studied. The results show that the water requirement of FAⅠis lower than that of FAⅡ. FAⅠcan use less water-reducing agent to keep the fresh concrete with good workability. FAⅠhas a more positive impact on the later strength development of concrete. As the increase of the fly ash replacement ratio, the electrical flux value of desalinated sea sand concrete decreases first and then increases, and FAⅠis better for improving the resistance of concrete to chloride ion penetration. As the age increases, the replacement ratio of FAⅡshould not be higher than 15%. The maximum amount of FAⅠcan reach 30%~45% when the water-binder ratios are 0.4 and 0.3.

鲍聪,梁超锋,占海华,,等.PMMA聚合物复合混凝土的制备及机理研究[J].混凝土与水泥制品,2021(2):18-22. BAO C,LIANG C F,ZHAN H H,et al.Effect of Fly Ash on the Properties of Desalinated Sea Sand Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):18-22.

变温历程对混凝土抗裂效能的影响

卞桂荣1，李宝枝1，李明2,3，徐文4，田倩2,3

2021年第2期

摘要

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摘要：为探究CEA和HME-V外加剂在变温历程实体混凝土结构中抗裂的效果，研究了温度历程对此类混凝土抗裂效能的影响。结果表明：温度历程对CEA和HME-V外加剂补偿收缩变形的影响显著，CEA的膨胀速率随温度的升高而加快，且在开裂风险高的温降阶段无补偿收缩变形作用，HME-V在温升及温降阶段均发挥较好的补偿变形作用，且与混凝土温度历程匹配较好；实际工程宜评估实体结构变温历程条件下CEA和HME-V外加剂的补偿收缩变形能力来优选抗裂效能较好的外加剂，并在满足设计要求的情况下，参考变温历程条件下混凝土强度的发展来确定拆模时间。 Abstract: In order to study the CEA and HME-V admixture in entity structure under variable temperature condition, the efficacy of concrete with CEA and HME-V under variable temperature condition was investigated. The results indicate that temperature condition has a significant impact on the compensation shrinkage deformation of crack-resistance agent. The expansion rate of CEA increases with the increase of temperature, and no compensation shrinkage deformation is generated in temperature drop stage with high cracking risk. HME-V can compensate shrinkage deformation not only in the temperature rise stage but also in the entire process, which matches well with the temperature process of entity structure. The ability of CEA and HME-V admixture to compensate shrinkage deformation should be evaluated to select the admixture with better crack resistance and form removal time for engineering in accordance with design and standards.

卞桂荣,李宝枝,李明,等.变温历程对混凝土抗裂效能的影响[J].混凝土与水泥制品,2021(2):23-26. BIAN G R,LI B Z,LI M,et al.Influence of Variable Temperature Condition on Crack Resistance of Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):23-26.

珊瑚砂水下不分散混凝土性能试验研究

廖绍华

2021年第2期

摘要

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摘要：研究了水泥用量、絮凝剂掺量、砂率对海水拌和珊瑚砂水下不分散混凝土性能的影响。结果表明：珊瑚砂水下不分散混凝土单位用水量为235~283 kg/m3时，砂率对单位用水量的影响最为显著，用水量随砂率增加而增大；水泥用量为400~490 kg/m3时，28 d抗压强度在26~39 MPa之间，可配制C20~C30水下不分散混凝土；水泥用量对抗压强度的影响最为显著，强度随水泥用量的增加而增大；水陆强度比随水泥和絮凝剂掺量增加而增大。 Abstract: The effects of cement dosage, anti-washout admixture dosage and sand rate on the performance of underwater sand-dispersed concrete with coral sand were studied. The results show when the water consumption of the anti-washout concrete is between 235~283 kg/m3, the sand rate has the most significant effect on the unit water consumption. With the water consumption increasing, the sand rate increases significantly. When the cement dosage is 400~490 kg/m3, the 28 d compressive strength of underwater concrete is between 26~39 MPa, and C20~C30 anti-washout concrete can be prepared. The amount of cement is the most significant in compressive strength, and the strength increases with increasing amount of cement. At the same time, the underwater/in-air strength ratio increases as the amount of cement and anti-washout admixture increases.

廖绍华.珊瑚砂水下不分散混凝土性能试验研究[J].混凝土与水泥制品,2021(2):27-31. LIAO S H.Experimental Study on Anti-washout Underwater Concrete with Coral Sand [J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):27-31.

絮凝剂对水泥砂浆强度的影响

荣辉1，张树青1，张磊1，张颖1,2，徐蕊1，杨永1，刘汉桥1

2020年第2期

摘要

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摘要：研究了纤维素絮凝剂、多聚糖絮凝剂在单掺和复掺情况下对水泥砂浆抗压强度的影响，并采用X-射线衍射（XRD）、傅立叶红外光谱分析（FTIR）、扫描电镜（SEM）对试样进行了微观分析。结果表明：两种絮凝剂单掺会降低砂浆的早期强度，但能够提升后期的抗压强度，而两种絮凝剂复掺会降低早期和后期的抗压强度。 Abstract: The influence of cellulose flocculant and polysaccharide flocculant on the compressive strength of cement mortar under single and compound mixing conditions was studied. X-ray diffraction (XRD), Fourier infrared spectroscopy (FTIR), and scanning electron microscope (SEM) were used for microscopic analysis of the samples. The results show that the two of single-doped flocculants can reduce the early strength of the mortar, but improve the compressive strength in the later stage. Both of the early and late compressive strength are reduced when the two flocculants are mixed.

荣辉,张树青,张磊,等.絮凝剂对水泥砂浆强度的影响[J].混凝土与水泥制品,2021(2):32-36. RONG H,ZHANG S Q,ZHANG L,et al.Effect of Flocculant on Strength of Cement Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):32-36.

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