基于体视学的SAP混凝土气孔结构分析与研究
发布时间：2018-08-13 09:37
【摘要】：为了研究混凝土在添加高吸水性树脂后其内部气孔结构的变化规律,以及内部气孔结构的变化对混凝土试样抗压强度的影响,基于定量体视学的电子显微图像分析方法,对添加SAP混凝土的内部气孔结构特征展开了相关试验研究。采用干拌的方法拌和SAP混凝土,对不同配合比和不同SAP掺量的混凝土进行分批试验,测定出各组试样的气孔结构参数和抗压强度等,以深层次的剖析SAP对混凝土强度和内部气孔结构的影响。研究结果表明:混凝土内部气孔的平均孔径与间距系数随着SAP含量和水灰比的增加而增大,而混凝土抗压强度则呈现出相反的变化趋势。在配合比相同的情况下,小粒径SAP颗粒对混凝土气孔率的提高效果更为明显,而大粒径SAP颗粒对混凝土气孔平均孔径的提高效果更为明显;水灰比对气孔平均间距系数影响显著,而SAP粒径对混凝土内部气孔平均间距系数的影响不明显。
[Abstract]:In order to study the change of pore structure in concrete after adding super absorbent resin, and the influence of the change of pore structure on compressive strength of concrete specimen, a quantitative stereoscopic electron microscopic image analysis method was developed. In this paper, the internal pore structure characteristics of concrete with SAP are studied. SAP concrete was mixed with dry mixing method. The concrete with different mix ratio and different SAP content was tested in batches, and the pore structure parameters and compressive strength of each sample were determined. The effect of SAP on the strength and internal pore structure of concrete is analyzed in depth. The results show that the average pore diameter and spacing coefficient increase with the increase of SAP content and water-cement ratio, but the compressive strength of concrete shows a reverse trend. Under the same mix ratio, the effect of increasing porosity of concrete with small diameter SAP particles is more obvious, while that of large diameter SAP particles is more obvious. The water-cement ratio has a significant effect on the average pore spacing coefficient, while the SAP particle size has no significant effect on the average pore spacing coefficient in concrete.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;天津大学滨海土木工程与安全教育部重点实验室;天津大学建筑工程学院;
【基金】：国家自然科学基金(51309179)
【分类号】：TU528
本文编号：2180591
[Abstract]:In order to study the change of pore structure in concrete after adding super absorbent resin, and the influence of the change of pore structure on compressive strength of concrete specimen, a quantitative stereoscopic electron microscopic image analysis method was developed. In this paper, the internal pore structure characteristics of concrete with SAP are studied. SAP concrete was mixed with dry mixing method. The concrete with different mix ratio and different SAP content was tested in batches, and the pore structure parameters and compressive strength of each sample were determined. The effect of SAP on the strength and internal pore structure of concrete is analyzed in depth. The results show that the average pore diameter and spacing coefficient increase with the increase of SAP content and water-cement ratio, but the compressive strength of concrete shows a reverse trend. Under the same mix ratio, the effect of increasing porosity of concrete with small diameter SAP particles is more obvious, while that of large diameter SAP particles is more obvious. The water-cement ratio has a significant effect on the average pore spacing coefficient, while the SAP particle size has no significant effect on the average pore spacing coefficient in concrete.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;天津大学滨海土木工程与安全教育部重点实验室;天津大学建筑工程学院;
【基金】：国家自然科学基金(51309179)
【分类号】：TU528
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