CAJ | 학술논문

通过对比活性不同的两种砂制备的砂浆试样在碱硅酸反应中的膨胀率，结合三轴抗压测试研究了碱硅酸反应前后水泥基材料的力学性能变化，分析了碱硅酸反应后材料微观结构演变与力学性能间的关系。结果表明碱惰性砂制备的砂浆试样中骨料周围局部区域形成少量针状凝胶相，由于碱硅酸反应速率较慢且凝胶相较少，因而其膨胀率较小且对水泥基材料力学性能的影响较小。碱活性砂制备的砂浆试样中，骨料周围易生成大量针状凝胶层，且随着碱硅酸反应的进行凝胶相膨胀加剧，促进水泥基材料中骨料周围的水泥浆体中形成大量裂纹，进而明显影响水泥基材料的力学性能。研究表明，三轴抗压测试中，除膨胀率外，极限抗压强度和应变量也可以作为评价水泥基材料碱硅酸反应水平的参量。
통과대비활성불동적량충사제비적사장시양재감규산반응중적팽창솔，결합삼축항압측시연구료감규산반응전후수니기재료적역학성능변화，분석료감규산반응후재료미관결구연변여역학성능간적관계。결과표명감타성사제비적사장시양중골료주위국부구역형성소량침상응효상，유우감규산반응속솔교만차응효상교소，인이기팽창솔교소차대수니기재료역학성능적영향교소。감활성사제비적사장시양중，골료주위역생성대량침상응효층，차수착감규산반응적진행응효상팽창가극，촉진수니기재료중골료주위적수니장체중형성대량렬문，진이명현영향수니기재료적역학성능。연구표명，삼축항압측시중，제팽창솔외，겁한항압강도화응변량야가이작위평개수니기재료감규산반응수평적삼량。
The expansion rate of mortars ,prepared with active sand and non-active sand ,under alkali-silica reaction (ASR) was recorded .The effects of ASR on mechanical properties of cementitious materials were studied by triaxial compression test .The relation between the microstructure of cementitious materials and the mechanical properties was investigated as well .The results showed that there was a little blade crystals gel formed in a local region near the aggregate in materials prepared with non-active sand .For the quantity of formed gel is small ,the expansion effects of ASR are limited .Whereas ,thick blade crystals gel layers formed near the aggregate when the active sand prepared materials subjected to ASR .Moreover ,the reactive products would lead to cracks and then significantly affects the mechanical properties of mortars . Additionally ,the results showed that besides the expansion rate ,the ultimate compressive strength and the strain are also effective indexes to estimate the influence of ASR .