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| 重晶石粉对重晶石混凝土性能的影响 |
| The influence of barite powder on the properties of barite concrete |
| 投稿时间：2025-03-10 修订日期：2025-03-25 |
| DOI： |
| 中文关键词: 重晶石粉 重晶石混凝土 工作性能 力学性能 微观结构 防辐射性能 |
| 英文关键词:Barite powder Barite concrete Workability Mechanical propertie Microstructure radiation resistance |
| 基金项目:湖南省自然科学基金(2024JJ5333),湖南省教育厅优秀青年项目(22B0443)。 |
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| 中文摘要: |
| 针对重晶石骨料因其高脆性在工程应用中易产生大量重晶石粉,进而对工程质量构成不利影响的问题,对不同比例的重晶石粉替代粗、细骨料对重晶石混凝土工作性能、力学性能以及γ射线屏蔽性能的影响进行了研究,并通过扫描电子显微镜(SEM)和压汞法(MIP)对微观结构的影响和作用机理进行研究。试验结果表明：采用适量的石粉等量取代骨料可以有效提高混凝土工作性能和表观密度;随着石粉掺量的增加,混凝土抗压强度先增加后降低,石粉掺量为3%时混凝土抗压强度达到最大,石粉掺量过高时,混凝土强度大幅度降低;石粉掺量对混凝土7 d劈裂抗拉强度影响与抗压强度一致,对28 d劈裂抗拉强度无明显影响。石粉掺量小于5%时混凝土γ射线屏蔽能力与线屏蔽系数增大,掺量在5%～7%时混凝土防辐射性能降低,且混凝土上下层屏蔽性能差异明显。SEM和压汞测试结果表明,适量石粉的加入对混凝土有一定的填充效应和成核效应,水化产物增加,混凝土微观结构更加密实,过量的石粉阻碍水泥水化,混凝土试样表面孔隙裂缝增加,微观结构变得松散。 |
| 英文摘要: |
| In response to the problem of a large amount of barite powder in engineering applications, and then the problem of adverse effects on the quality of engineering quality, this study deeply discussed the alternative of barite stone powder with different proportions the impact of barite concrete workability, mechanical properties, and gamma-ray shielding performance, and studies the impact and mechanism of effect on micro -structures by scanning electron microscope (SEM) and mercury pressure (MIP). The test results show that using an appropriate amount of stone powder and other amounts to replace the aggregate can effectively improve the performance of concrete work and reduce the degree of departure; as the content of stone powder increases, the concrete compressive strength increases and then decreases. When the maximum of the stone powder is too high, the strength of the concrete is greatly reduced; the content of the stone powder on the concrete 7 D splitting and tensile strength is consistent with the pressure resistance strength, and there is no significant effect on the 28 D split -resistant tensile strength. When the stone powder content is less than 5%, the gamma-ray shielding capacity and linear attenuation coefficient of the concrete increase. However, when the stone powder content ranges between 5% and 7%, the radiation shielding performance of the concrete decreases, and a noticeable difference in shielding effectiveness is observed between the upper and lower layers of the concrete.SEM and mercury test results show that the addition of moderate amounts of stone powder has a certain filling effect and nuclear effect on concrete, increased hydrophilic products, the micro -structured concrete micro -structures are more dense, excessive stone powder hinders cement hydration, and the increased porosity of concrete sample pores increases. The micro structure becomes loose. |
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