【摘要】 近海道路桥梁工程受海水侵蚀严重,因此亟需寻求一种耐盐侵蚀的新材料。现对掺入氯化钠(Na Cl)的碱激发火山灰(AP)净浆的抗压强度进行测试,同时通过X射线衍射(XRD)、热重分析(TGA)两种微观测试手段,探求Na Cl对AP净浆强度的影响作用。试验结果表明:AP净浆抗压强度随Na Cl掺入量的增加而增加,Na Cl掺量为30%的净浆强度是无Na Cl净浆强度的2.1倍。XRD、TGA测试结果表明,掺加Na Cl的AP净浆中有新水化物弗里德尔盐(FS)和氢氧化钠(Na OH)生成,这两种水化物的生成可能是造成净浆强度提高的主因,两种水化物生成的越多,AP净浆结构越优化,强度提高越显著。AP作为一种新胶凝材料,可适用于高氯盐环境下的近海道路桥梁工程中。更多还原

【Abstract】 Offshore roads and bridges were severely eroded by seawater, thus, a new cementitious material of salt-erosion is now urgently needed. Compressive strength of alkali-activated pozzolana(AP) paste mixed with Na Cl, X-ray diffraction(XRD) and thermal gravimetric analysis(TGA) were conducted to investigate the influence of Na Cl affect strength of AP paste. The results showed that the compressive strength of AP paste strength increases with increase of mixed Na Cl,the strength of paste of 30% Na Cl content is 2.1 times than the strength of paste without Na Cl. XRD, TGA test results showed that two hydrates Friedel salt(FS) and sodium hydroxide(Na OH) were generating in the AP paste which mixed Na Cl, these hydrates may be responsible for improving the strength paste, the more hydrates generated, the more optimization AP paste structure, finally the strength increased more significant.AP as a new cementitious material,applicable to high chloride environment of coastal roads and bridge projects.更多还原