混凝土研究_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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混凝土研究

利用DOE和紧密堆积理论优化UHPC设计

李火星，孔祥付，李伯川，胡建

2024年第3期

摘要

引用本文

摘要：使用DOE设计理论，根据所选原材料的性能和产品工艺要求先设定基础参数和优化目标，再基于颗粒紧密堆积理论（MAA）得到标准预混料的配合比；然后利用全因子试验筛选重要因子并确定极值范围后进行响应面模型分析；最后输出得到符合使用要求的超高性能混凝土（UHPC）配合比。验证试验结果表明：优化配合比后，所配制的UHPC流动度和密实度预测值均在误差范围内，结果较可靠。 Abstract: Adopting DOE design theory, firstly, the basic parameters and optimization objectives were set according to the selected raw material properties and product process requirements. Then the mix proportion of standard premix was obtained based on the theory of compact accumulation of particles(MAA), and the response surface model analysis was carried out by using the full factorial test to screen the important factors and to determine the range of extremes, and the output was obtained to obtain the mix proportion of ultra-high performance concrete(UHPC) that meet the requirements for use. The verification test results show that the predicted values of flowability and compactness of UHPC prepared by optimizing the mix proportion are within the error range, and the results are relatively reliable.

李火星,孔祥付,李伯川,等.利用DOE和紧密堆积理论优化UHPC设计[J].混凝土与水泥制品,2024(3):1-6. LI H X,KONG X F,LI B C,et al.Optimized design of UHPC based on DOE and MAA[J].China Concrete and Cement Products,2024(3):1-6.

石粉含量对C60机制砂混凝土徐变的影响

盖珂瑜1,2，韩江龙1，3，*，王永宝3，吴柏翰2

2024年第3期

摘要

引用本文

摘要：研究了不同石粉含量对C60机制砂混凝土徐变的影响，并对现有徐变预测模型进行了对比分析。结果表明：当机制砂石粉含量不超过15%时，各组试件的抗压强度均可满足C60强度等级的要求，各组试件120 d的徐变应变约为（180～230）×10-6，徐变系数在0.41～0.56之间；随着石粉含量的增加，各组试件的徐变应变呈现先减小后增大的趋势，徐变系数呈先增大后减小的趋势；石粉含量对C60机制砂混凝土徐变的影响不显著；现有徐变模型对徐变系数的计算结果均大于实测结果；相比较之下，fib MC 2010模型更适用于高强机制砂混凝土的徐变预测。 Abstract: The effect of different contents of stone powder on the creep of C60 manufactured sand concrete was studied, and a comparative analysis of existing creep prediction models was conducted. The results show that when the stone powder contents of concrete with manufactured sand do not exceed 15%, the compressive strength of each group of specimens can meet the requirements of C60 strength grade, and the creep strain of each group of specimens at 120 d is about (180~230)×10-6, with a creep coefficient from 0.41 to 0.56. With the increase of stone powder content, the creep strain of each group of specimens shows a trend of first decreasing and then increasing, and the creep coefficient shows a trend of first increasing and then decreasing. The effect of stone powder content on the creep of C60 manufactured sand concrete is not significant. The calculation results of existing creep models for creep coefficients are all greater than the measured results. By comparison, the fib MC 2010 model is more suitable for predicting the creep of high-strength manufactured sand concrete.

盖珂瑜,韩江龙,王永宝,等.石粉含量对C60机制砂混凝土徐变的影响[J].混凝土与水泥制品,2024(3):7-11. GE K Y,HAN J L,WANG Y B,et al.Influence of the stone powder content on the creep of C60 manufactured sand concrete[J].China Concrete and Cement Products,2024(3):7-11.

纳米C-S-H早强剂对水泥水化的影响研究

王可汗1，李伟1，2，郑春扬1，吉飞1，孔祥发1，王学川1

2024年第3期

摘要

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摘要：通过凝结时间、水化温度、XRD、SEM、抗压强度试验等研究了纳米C-S-H早强剂对水泥水化及混凝土强度的影响，并分析了作用机理。结果表明：纳米C-S-H早强剂明显缩短了水泥的凝结时间；随着纳米C-S-H早强剂掺量的增加，水化温度峰出现时间缩短，且峰值提高；掺入适量的纳米C-S-H早强剂不改变水泥的水化产物种类，但加速了水泥水化进程，提高了混凝土的早期抗压强度，且后期（28 d、56 d）抗压强度无倒缩。 Abstract: The influence of nano C-S-H early strength agent on cement hydration and concrete strength was studied through setting time, hydration temperature, XRD, SEM, and compressive strength tests, and the mechanism of the action was analyzed. The results show that the nano C-S-H early strength agent significantly shortens the setting time of cement. With the increase of the content of nano C-S-H early strength agent, the time for the hydration temperature peak to appear is shortened, and the temperature peak increases. The suitable addition of nano C-S-H early strength agent does not change the type of hydration products in cement, but accelerates the cement hydration process, improves the early compressive strength of concrete, and there is no shrinkage in the later(28 d、56 d) compressive strength.

王可汗,李伟,郑春扬,等.纳米C-S-H早强剂对水泥水化的影响研究[J].混凝土与水泥制品,2024(3):12-15,20. WANG K H,LI W,ZHENG C Y,et al.Research on the influence of nano C-S-H early strength agent on cement hydration[J].China Concrete and Cement Products,2024(3):12-15,20.

高性能聚合物砂浆的制备与性能研究

毕承伟1，卢立群2，缪志勇2，钱玉德2，王星尧3，陈伟2，孙德文3

2024年第3期

摘要

引用本文

摘要：采用定向级配复合技术优化了河砂级配，再采用响应曲面法构建了聚合物砂浆性能预测模型，并对聚合物砂浆的配合比进行了优化。此外，研究了原材料组分交互作用对聚合物砂浆性能的影响，并建立了聚合物砂浆7 d抗折、抗压强度与水泥掺量、膨胀剂掺量、胶粉掺量的二阶响应曲面模型。结果表明：高性能聚合物砂浆的最佳配合比为水泥掺量420 g、膨胀剂掺量10 g、胶粉掺量20 g，以此配合比制备的高性能聚合物砂浆7 d抗折、抗压强度分别可达8.4 MPa、55.7 MPa。 Abstract: The directional gradation composite technology was used to optimize the river sand gradation, and the response surface method was used to construct a performance prediction model for polymer mortar, and the mix proportion of polymer mortar was optimized. In addition, the influence of raw material component interaction on the performance of polymer mortar was studied, and a second-order response surface model was established for the 7 d flexural and compressive strength of polymer mortar with cement, expansion agent, and rubber powder dosage. The results show that the optimal mix proportion for high performance polymer mortar is 420 g of cement, 10 g of expansion agent, and 20 g of adhesive powder, and the high performance polymer mortar prepared from this mix proportion can achieve a 7 d flexural and compressive strength of 8.4 MPa and 55.7 MPa.

毕承伟,卢立群,缪志勇,等.高性能聚合物砂浆的制备与性能研究[J].混凝土与水泥制品,2024(3):16-20. BI Chengwei, LU Liqun, MIAO Zhiyong,et al.Preparation and performance research of high performance polymer Mortar[J].China Concrete and Cement Products,2024(3):16-20.

基于非接触电阻率测量法的水泥基材料早期水化特性研究

于超胜

2024年第3期

摘要

引用本文

摘要：采用非接触电阻率测量法，基于电阻率与温差曲线，研究了硅灰掺量（5%、10%）和粉煤灰掺量（20%、40%）对水泥基材料早期水化的影响。结果表明：掺粉煤灰组水泥浆体的电阻率在约580 min前高于C组（基准组），在580 min后低于C组，而掺硅灰组水泥浆体正相反，在580 min后，掺硅灰组水泥浆体的电阻率高于C组；与C组相比，掺入粉煤灰后，水泥浆体的放热量减少，放热峰对应的时间延迟，而掺入硅灰后，水泥浆体的水化反应明显加快，放热峰对应的时间也随着硅灰掺量的增加而提前；相比于C组，掺粉煤灰组水泥浆体的凝结时间略微延长，掺硅灰组水泥浆体的凝结时间缩短；相较于掺入粉煤灰，掺入硅灰可以促进水泥水化，使水泥浆体微观结构更加致密。 Abstract: The influence of silica fume content(5%, 10%) and fly ash content(20%, 40%) on early hydration of cement-based materials was studied by combining non-contact resistivity measurement based on resistivity and temperature difference curves. The results show that the electrical resistivity of the cement slurry mixed with fly ash is higher than that of group C (benchmark group) before about 580 min, and lower than that of group C after 580 min, while the electrical resistivity of the cement slurry mixed with silica fume is the opposite. After 580 min, the electrical resistivity of the cement slurry mixed with silica fume is higher than that of group C. Compared with group C, the addition of fly ash reduces the heat release of the cement slurry and delays the time corresponding to the heat release peak. However, the addition of silica fume significantly accelerates the hydration reaction of the cement slurry, and the time corresponding to the heat release peak also advances with the increase of silica fume content. Compared to group C, the setting time of the cement slurry in the fly ash group is slightly longer, while the setting time of the cement slurry in the silica ash group is shorter. Compared to adding fly ash, adding silica fume can promote cement hydration and make the microstructure of cement slurry more compact.

于超胜.基于非接触电阻率测量法的水泥基材料早期水化特性研究[J].混凝土与水泥制品,2024(3):21-25. YU C S.Study on early hydration characteristics of cement-based materials based on non-contact resistivity measurement[J].China Concrete and Cement Products,2024(3):2024(3):21-25.

仿木水泥基材料的发展研究综述

庞超明1，厉彦浩1，高仁辉2，陈嘉俊1

2024年第3期

摘要

引用本文

摘要：根据木材特性，结合现有水泥基材料着色、轻质化、强韧化和功能化四方面技术，可以制备出成本低、性能优、安全性高、轻质高比强的仿木水泥基复合材料，实现多维度性能的“仿木”。此外，对仿木水泥基材料的密度、强度、导热系数、颜料选择等指标提出了建议，并对未来的研究方向进行了展望。 Abstract: Based on the characteristics of wood, combined with existing cementitious materials coloring, lightweighting, toughening, and functionalization technologies, low-cost, high-performance, high safety, lightweight, and high strength specific woodcrete can be prepared, achieving multi-dimensional performance of "wood like". In addition, suggestions are made for the density, strength, thermal conductivity, pigment selection and other indicators of woodcrete, and future research directions are also discussed.

庞超明,厉彦浩,高仁辉,等.仿木水泥基材料的发展研究综述[J].混凝土与水泥制品,2024(3):26-30. PANG Chaoming, LI Yanhao, GAO Renhui,Review of the development and research on woodcrete[J].China Concrete and Cement Products,2024(3):26-30.

骨料中的黄铁矿反应及其对胶砂试件的破坏机理研究

李叶青，王云摇*，马黎，郑赟昊，余松柏

2024年第3期

摘要

引用本文

摘要：研究了不同条件下（干燥环境、自然环境、干湿循环、冻融循环），用含黄铁矿细骨料制备的胶砂试件中黄铁矿反应及其对试件的破坏机理。结果表明：干燥环境下，黄铁矿反应较弱，自然环境、干湿循环、冻融循环条件下，黄铁矿反应较强；自然环境下，黄铁矿氧化，造成延迟型钙矾石和铁锈膨胀型破坏；干湿循环条件下，黄铁矿反应形成的石膏溶出，无延迟钙矾石形成，破坏形式以铁锈膨胀破坏为主；冻融循环条件下，黄铁矿反应形成延迟型钙矾石，但氧化不充分，生成四氧化三铁。 Abstract: The reaction of pyrite in rubber sand specimens prepared from pyrite containing fine aggregates under different conditions (dry environment, natural environment, dry-wet cycle, freeze-thaw cycle) and its damage mechanism on the specimens were studied. The results show that in dry environments, the reaction of pyrite is weak, while in natural environment, wet-dry cycles, and freeze-thaw cycles, the reaction of pyrite is strong. Under natural conditions, pyrite oxidizes, causing delayed ettringite and rust expansion damage. Under dry-wet cycle conditions, gypsum formed by pyrite reaction dissolves without delayed ettringite formation, and the main form of destruction is rust expansion and destruction. Under freeze-thaw cycle conditions, pyrite reacts to form delayed ettringite, but the oxidation is not sufficient, resulting in the formation of magnetite.

李叶青,王云摇,马黎,等.骨料中的黄铁矿反应及其对胶砂试件的破坏机理研究[J].混凝土与水泥制品,2024(3):31-35,42. LI Y Q,WANG Y Y,MA L,et al.Research on the reaction of pyrite in aggregates and its damage mechanism on mortar specimens[J].China Concrete and Cement Products,2024(3):31-35,42.

水泥基渗透结晶型材料与纳米材料对混凝土性能的影响

杜英欣1，2，马再禹1，任广毅1，王正君1，*，刘瑛文3

2024年第3期

摘要

引用本文

摘要：研究了水泥基渗透结晶型材料（XYPEX掺合剂）与纳米材料复掺（纳米CaCO3）对混凝土性能的影响。结果表明：适量XYPEX掺合剂与纳米CaCO3复掺可以改善混凝土的性能；3.0%的XYPEX掺合剂与0.5%的纳米CaCO3复掺可以显著提高混凝土的抗压强度；2.0%的XYPEX掺合剂与0.5%的纳米CaCO3复掺可以显著提高混凝土的早期劈裂抗拉强度；1.0%的XYPEX掺合剂与1.0%的纳米CaCO3复掺时，混凝土的抗冻性能最佳。 Abstract: The effect of cement based permeable crystalline materials(XYPEX admixture) and nano-material composite(nano CaCO3) on the performance of concrete was studied. The results show that the combination of XYPEX admixture and nano CaCO3 can improve the performance of concrete. The combination of 3.0% XYPEX admixture and 0.5% nano CaCO3 can significantly improve the compressive strength of concrete. The combination of 2.0% XYPEX admixture and 0.5% nano CaCO3 can significantly improve the early splitting tensile strength of concrete. When 1.0% XYPEX admixture is combined with 1.0% nano CaCO3, the frost resistance of concrete is the best.

杜英欣,马再禹,任广毅,等.水泥基渗透结晶型材料与纳米材料对混凝土性能的影响[J].混凝土与水泥制品,2024(3):36-42. DU Y X,MA Z Y,REN G Y,et al.Influence of cement based permeable crystalline materials and Nano-materials on the properties of concrete[J].China Concrete and Cement Products,2024(3):36-42.

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