混凝土研究_2023_《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

基于图像处理技术的机制砂形貌及机制砂混凝土性能研究

郭耀雄1，史星祥2，*，徐志军1，张蕊2，陈渊星1，许志杨2，刘远祥2，夏如茜2，王海新2

2023年第9期

摘要

引用本文

摘要：通过图像处理技术研究了影响机制砂颗粒形貌的主要因素及其与机制砂性能的相关性，分析了机制砂颗粒形貌对混凝土性能的影响。结果表明：用经过修正后的球形度指标评价机制砂颗粒形貌比圆形度更合理；使用立轴冲击破制备的机制砂颗粒形貌最好；母岩强度与颗粒形貌呈负相关关系；机制砂的球形度增加，其抵抗压碎的能力较高，且具有较低的空隙率；当球形度由53%提高至72%时，对中低强度等级机制砂混凝土的工作性改善效果显著，而对高强度等级机制砂混凝土的抗压强度改善效果显著。 Abstract: The main factors affecting the particle morphology of manufactured sand and their correlation with the performance of manufactured sand were studied through image processing technology, and the impact of manufactured sand morphology on concrete performance was analyzed. The results indicate that the modified sphericity index is more reasonable for evaluating the particle morphology of manufactured sand compared to circularity. The manufactured sand prepared by using vertical axis impact fracture has the best particle morphology. The strength of the parent rock is negatively correlated with the particle morphology. The sphericity of manufactured sand increases, resulting in higher resistance to crushing and lower porosity. When the sphericity increases from 53% to 72%, the workability of medium and low strength grade manufactured sand concrete is significantly improved, while the compressive strength of high strength grade manufactured sand concrete is significantly improved.

郭耀雄,史星祥,徐志军,等.基于图像处理技术的机制砂形貌及机制砂混凝土性能研究[J].混凝土与水泥制品,2023(9):1-6,11. GUO Y X,SHI X X,XU Z J,et al.Research on the morphology of manufactured sand and the performance of manufactured sand concrete based on image processing technology[J].China Concrete and Cement Products,2023(9):1-6,11.

超高性能混凝土工作性与流变性的关系研究

商涛平1，王洪新1，孙德安2，吕帅灵2

2023年第9期

摘要

引用本文

商涛平,王洪新,孙德安,等.超高性能混凝土工作性与流变性的关系研究[J].混凝土与水泥制品,2023(9):7-11. SHANG T P,WANG H X,SUN D A,et al.Research on the relationship between workability and rheology of ultra-high performance concrete LYU Shuailing[J].China Concrete and Cement Products,2023(9):7-11.

石粉掺量对SCC净浆基本需水率和水量敏感系数的影响

张京斌1，刘祥东1，姚国友2，沈德建1，安雪晖3，韩迅4

2023年第9期

摘要

引用本文

摘要：基于净浆扩展度试验研究了不同超细石粉掺量（0、15%、30%、45%、60%）对自密实混凝土（SCC）净浆基本需水率和水量敏感系数的影响。结果表明：随着石粉掺量的增大，SCC净浆的基本需水率逐渐增大；SCC净浆的等效堆积密实度随着石粉掺量的增大而逐渐减小；SCC净浆的基本需水率和等效堆积密实度与混合粉体的比表面积呈显著的线性关系；SCC净浆的水量敏感系数随石粉掺量的增加先略有上升，但当石粉掺量超过15%后，其水量敏感系数呈现缓慢下降趋势，当石粉掺量达到45%时，下降到最小值，之后随石粉掺量继续增加，SCC净浆的水量敏感系数又呈显著增大趋势。 Abstract: The effects of different limestone powder contents(0, 15%, 30%, 45% and 60%) on the basic water demand rate and water sensitivity coefficient of self-compacting concrete(SCC) were studied by using the mini-slump flow test. The results show that as the content of limestone powder increases, so does the basic water demand rate, while the equivalent packing density of SCC paste decreases. The basic water demand rate and the equivalent packing density of SCC paste have a significant linear relationship with the specific surface area of the mixed powder. When the limestone powder content exceeds 15%, the water sensitivity coefficient of SCC paste increases slightly and then gradually decreases, and reaches a minimum value when the limestone powder content reaches 45%. The SCC paste’s water sensitivity coefficient then rises sharply as the limestone powder content is significantly increased.

张京斌,刘祥东,姚国友,等.石粉掺量对SCC净浆基本需水率和水量敏感系数的影响[J].混凝土与水泥制品,2023(9):12-16. ZHANG J B,LIU X D,YAO G Y,et al.Effect of limestone powder content on basic water demand rate and water sensitivity coefficient of SCC paste[J].China Concrete and Cement Products,2023(9):12-16.

基于最紧密堆积理论的自密实混凝土制备与性能研究

时宇，罗小东，彭丙杰，吴涛，陶俊，黄小川

2023年第9期

摘要

引用本文

摘要：基于最紧密堆积理论，对砂石和胶凝材料进行了最紧密堆积设计，选用最佳配合比制备了高速铁路CRTSⅢ型板式无砟轨道自密实混凝土，并对其性能进行了测试。结果表明：当m2区砂∶m3区砂=6∶4，m5～10 mm石∶m5～10 mm石=4∶6，水泥、粉煤灰、矿粉质量比为7.0∶0.5∶2.5，水胶比为0.35，膨胀剂掺量为5%时，所制备的自密实混凝土性能良好，扩展度可达660~680 mm，T500为4~6 s，28 d抗压强度＞40 MPa，56 d干燥收缩≤400×10-6，满足相关标准要求。 Abstract: Based on the dense packing theory, the design of the dense packing of sand and cementitious materials was carried out. The optimal mix proportion was selected to prepare the high-speed railway CRTSⅢ type slab ballastless track self-compacting concrete, and its performance was tested. The results show that when mzone 2 sand∶ mzone 3 sand=6∶4, m5~10 mm stone∶m5~10 mm stone=4∶6, the mass ratio of cement, fly ash, and mineral powder is 7.0∶0.5∶2.5, water binder ratio is 0.35, and the content of expansion agent is 5%, the self-compacting concrete has good performance. The expansion can reach to 660~680 mm, T500 is 4~6 s, 28 d compression strength＞40 MPa and 56 d drying shrinkage≤400×10-6, meeting relevant standard requirements.

时宇,罗小东,彭丙杰,等.基于最紧密堆积理论的自密实混凝土制备与性能研究[J].混凝土与水泥制品,2023(9):17-22. SHI Y,LUO X D,PENG B J,et al.Preparation and performance research of self-compacting concrete based on dense packing theory[J].China Concrete and Cement Products,2023(9):17-22.

不同缓凝剂缓凝效果研究及机理分析

吴昊，查炎鹏，王靖，王二帅，李永亮，王霞

2023年第9期

摘要

引用本文

摘要：研究了不同缓凝剂（传统缓凝剂、膦酸盐缓凝剂）复配聚羧酸减水剂后对水泥凝结时间和水化特性的影响。结果表明：葡萄糖酸钠和蔗糖缓凝效果较好，焦磷酸钠与柠檬酸钠对水泥凝结时间的影响程度基本接近，膦酸盐缓凝剂对抑制水泥水化的作用效果更为平稳、持续，相同掺量时（0.1%），其可以推迟峰值温度出现时间2～52 h不等，降低同龄期总水化热达250%～1 100%；各类缓凝剂的缓凝作用多体现在对于水泥初凝时间的推迟，膦酸盐缓凝剂相较于传统缓凝剂具备更好的缓凝效果。 Abstract: The influence of polycarboxylic acid water reducer mixed with different retarders(traditional retarder, phosphate retarder) on the setting time and hydration characteristics of cement was studied. The results show that sodium gluconate and sucrose have good retarding effect, and the influence of sodium pyrophosphate and sodium citrate on the setting time of cement is basically close. The effect of phosphate retarder on inhibiting the hydration of cement is more stable and continuous, and it can delay the peak temperature for 2~52 h, and reduce the total hydration heat of the same age by 250%~1 100% when the dosage is 0.1%. The retarding effect of various retarders is mainly reflected in the delay of the initial setting time of cement. Compared with traditional retarders, phosphate retarders have better retarding effect.

吴昊,查炎鹏,王靖,等.不同缓凝剂缓凝效果研究及机理分析[J].混凝土与水泥制品,2023(9):23-26. WU H,ZHA Y P,WANG J,et al.Study on the retarding effect and mechanism analysis of different retarders[J].China Concrete and Cement Products,2023(9):23-26.

高地热隧道衬砌混凝土的配制参数研究

高龙1，李享涛2,*，付志勇2

2023年第9期

摘要

引用本文

摘要：针对西部地区隧道施工面临的高地热问题，研究了水泥种类对20、60、80 ℃的衬砌混凝土早期水化温升和抗压强度的影响，并模拟分析了隧道地热环境下不同含气量衬砌混凝土的塑性变形及抗压强度增长规律、外掺石粉制备的低含气量衬砌混凝土的工作性和力学性能以及不同种类保水剂对衬砌混凝土早期失水率的影响，提出了高地热隧道衬砌混凝土的最佳配制参数。结果表明：在高地热环境下低热水泥衬砌混凝土的水化温升较普通水泥衬砌混凝土降低了4 ℃，90 d抗压强度提高了11.5%～16.5%；衬砌混凝土的含气量越高，高温对其后期强度的降低幅度越显著；复掺石粉可有效改善低含气量衬砌混凝土的工作性，石粉掺量宜为6%～15%；保水剂聚丙烯酰胺对抑制衬砌混凝土早期失水的作用优于纤维素醚，聚丙烯酰胺掺量宜为0.05%～0.10%。 Abstract: In view of the high geothermal problem faced by tunnel construction in the western region, the influence of cement types on the early hydration temperature rise and compressive strength of lining concrete under 20, 60 and 80 ℃ ambient temperatures was studied. The laws of plastic deformation and compressive strength growth of lining concrete with different air content under simulated tunnel geothermal environment were analyzed. The workability and mechanical properties of lining concrete with low air content prepared by adding stone powder were compared. The influence of different water retaining agents on the water loss rate of lining concrete was studied, and the preparation parameters of the lining concrete for high geothermal tunnel were proposed. The results show that the hydration temperature rise of low hydration heat cement lining concrete is reduced by 4 ℃ compared to ordinary cement lining concrete under high geothermal environment, and the 90 d compressive strength is increased by 11.5% to 16.5%. The higher the air content of lining concrete is, the more significant the later strength of lining concrete caused by high temperature decrease. Composite addition of stone powder can effectively improve the workability of low air content lining concrete, and the suitable stone powder content is about 6% to 15%. The effect of polyacrylamide on inhibiting early water loss of lining concrete is better than that of cellulose ether, and the suitable content of polyacrylamide is 0.05% to 0.10%.

高龙,李享涛,付志勇.高地热隧道衬砌混凝土的配制参数研究27-31,40. GAO L,LI X T,FU Z Y.Research on the preparation parameters of lining concrete for high geothermal tunnel[J].China Concrete and Cement Products,2023(9):27-31,40.

聚合物改性水泥砂浆黏结强度试验研究

徐洪涛1，李娜2，冯虎3

2023年第9期

摘要

引用本文

摘要：采用正交试验分析了聚合物改性水泥砂浆与混凝土板的黏结强度，研究了水胶比、聚胶比、砂胶比及矿物掺合料取代率对黏结强度的影响，并用正交表L16（45）进行了试验配合比设计。结果表明：正交试验直观分析法与方差分析法结论一致，水胶比、聚胶比、砂胶比对黏结强度的影响显著，而矿物掺合料取代率的影响较小；影响显著性顺序为水胶比＞砂胶比＞聚胶比；聚合物改性水泥砂浆的最优配合比为：水胶比0.25、聚胶比0.05、砂胶比1.5、矿物掺合料取代率20%，此时黏结强度较高。 Abstract: Orthogonal experiments were used to analyze the bonding strength between polymer modified cement mortar and concrete slabs. The effects of water-binder ratio, polymer-binder ratio, sand-binder ratio, and mineral admixture substitution rate on the bonding strength were studied. Orthogonal experiment L16(45) was used for mix proportion design. The results show that the conclusions of the orthogonal experimental intuitive analysis method and the analysis of variance method are consistent. The water-binder ratio, polymer-binder ratio, and sand-binder ratio have a significant impact on the bonding strength, but the influence of mineral admixture substitution rate on the bonding strength can be ignored. The order of significance of the impact is water-binder ratio>sand-binder ratio>polymer-binder ratio. The optimal mix proportion for polymer modified cement mortar is water-binder ratio of 0.25, polymer-binder ratio of 0.05, sand-binder ratio of 1.5, and mineral admixture substitution rate of 20%, At this point, the bonding strength of the interface is relatively high.

徐洪涛,李娜,冯虎.聚合物改性水泥砂浆黏结强度试验研究[J].混凝土与水泥制品,2023(9):32-35,40. XU H T,LI N, FENG H.Experimental study on the bonding strength of polymer modified cement mortar[J].China Concrete and Cement Products,2023(9):32-35,40.

减缩型聚羧酸减水剂的合成及性能研究

杨飞1，吕凯2，周伟1，曾志勇3，杨淑娟2，王战1，李康1，张勇2

2023年第9期

摘要

引用本文

摘要：自主研发合成了一种减缩型聚羧酸减水剂（SRPCE），研究了掺SRPCE的胶砂和混凝土的性能，并通过表面张力分析，阐述了SRPCE影响混凝土收缩性能的作用机理。结果表明：SRPCE可以有效地降低胶砂和混凝土的收缩，提高混凝土的减水率和强度。 Abstract: A shrinkage reducing polycarboxylate superplasticizer(SRPCE) was developed and synthetized, and the properties of mortar and concrete mixed with SRPCE were studied. The mechanism of SRPCE affecting the shrinkage performance of concrete was elucidated through surface tension analysis. The results indicate that SRPCE can effectively reduce the shrinkage of mortar and concrete, and improve the water reduction rate and strength of concrete.

杨飞,吕凯,周伟,等.减缩型聚羧酸减水剂的合成及性能研究[J].混凝土与水泥制品,2023(9):36-40. YANG F,LYU K,ZHOU W,et al.Synthesis and performance of shrinkage reducing polycarboxylate superplasticizer[J].China Concrete and Cement Products,2023(9):36-40.

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