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将绿色废弃玻璃粉取代部分水泥,绿色废弃玻璃砂取代部分天然砂制成砂浆试件,研究碱-硅酸反应。对分别掺加0%,10%,20%,30%的绿色玻璃粉和0%,30%,50%,70%,100%的绿色玻璃砂砂浆试件分别进行碱-硅酸反应试验,通过80℃水浴养护3,7,10,14,28,56d后检测砂浆试件的膨胀率。结果表明,碱骨料试件14d膨胀率均低于0.1%,所有试样均无开裂、变形、表面无胶状物质渗出,无潜在的碱骨料膨胀破坏;废弃玻璃粉的火山灰活性很大程度降低发生碱-硅酸反应膨胀破坏的可能性;当水浴养护56d后掺加30%玻璃砂的试件膨胀率为0.22%,大于0.2%,可能存在潜在的碱-硅酸反应破坏的危害;当玻璃砂的掺量超过30%,且随着玻璃砂掺量的增加,试件的膨胀率相应降低,并且通过电镜扫描绿色玻璃表面结构可以得出,绿色玻璃表面平滑,孔隙较少,说明绿玻璃砂的表面环境不易于发生碱-硅酸反应破坏。
The green waste glass powder replaced part of the cement, green waste glass sand replaced part of the natural sand mortar specimens were prepared to study the alkali-silicate reaction. Alkali-silicic acid reaction tests were carried out on green glass powder with 0%, 10%, 20% and 30% green glass powder and 0%, 30%, 50%, 70% and 100% Through the 80 ℃ water bath curing 3,7,10,14,28,56 d after the mortar specimen test the expansion rate. The results show that all the specimens have no cracking, deformation and no exudation of gelatinous substances on the surface, and no potential alkali aggregate swelling and destruction. The pozzolanic activity of waste glass powder is very low To a large extent reduce the possibility of alkali-silica reaction expansion damage; 56d after water bath with 30% glass frit specimen expansion rate of 0.22%, greater than 0.2%, there may be potential alkali-silicate reaction damage When the content of glass sand exceeds 30%, the expansion rate of the specimen decreases with the increase of the amount of glass sand. Scanning the surface structure of green glass by electron microscope, it can be concluded that the surface of green glass is smooth with less pores , Indicating that the surface environment of green glass sand is not prone to alkali-silicate reaction damage.