基于体视学的SAP混凝土气孔结构分析与研究

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.

Analysis and Research on Stomatal Structure of SAP Concrete Based on Stereology

In order to study the change rule of internal stomatal structure and the effect of internal stomatal structure characteristics on the compressive strength of SAP concrete specimens , the internal stomatal structure characteristics of SAP concrete were experimented based on electron microscopy analysis method.Using dry mix method, the concrete parameters such as porosity , mean pore diameter , stomatal grade, average pore spacing factor and compressive strength were measured , and the mix proportion and the SAP content were also taken into account in this batch test .The effects of SAP on the internal stomatal structure characteristics and strength of concrete were mainly studied .Results show that with the increase of concrete water-cement ratio and SAP addition , the average porosity , average pore diameter and stomatal spacing coefficient of different grades increased in different degrees , at the same time , the compressive strength of SAP concrete has a certain degree of decline; In the case of the same concrete mix proportion , the effect of small particle size SAP particles on the porosity of concrete is more obvious , and the effect of large particle size SAP particles on the average pore size of concrete is more obvious .The influence of concrete water-cement ratio on the average spacing coefficient of stomata has a significant effect, but SAP particle size has little effect on the average spacing coefficient of stomata .