加固体的劣化可分为加固体在非腐蚀场地形成后由于场地受到污染而发生的劣化问题和在腐蚀场地形成的加固体的劣化问题.针对后者,采用现场取土、室内制备加固体试样、现场埋设的方法,模拟在腐蚀场地形成加固体的过程,埋设在现场的加固体在腐蚀介质及水动力、温度和潮汐等外界因素共同作用下将发生劣化.将水泥土试样埋设在滨海场地长达3.5年,并实施微型贯入试验和化学试验.试验结果表明,劣化引起的强度降低滞后于其化学反应;水泥掺入比越小、埋设时间越长,水泥土劣化越严重;本试验条件下,水泥掺入比15％的水泥土1年、2.5年和3.5年的劣化深度分别达到了3.5、5.8和7.6 mm.基于试验结果提出了水泥土劣化深度预测式.%The deterioration of the reinforced structure can be classified into the deterioration problem due to site pollution after the reinforced structure is formed in the non-corrosive site and the deterioration problem that the reinforced structure is formed in the corrosive site.Aiming at the latter,the method of taking soil from site,preparing reinforced structure in door,and burying reinforced structure in site is implemented.Reinforced structure buried in site will be deteriorated under the influence of corrosive media and the external factors such as hydrodynamic force,temperature and tide.The micro-penetration test and chemical tests of the cement soil samples buried in the coastal site for 3.5 years are conducted.The results show that the decrease of strength caused by deterioration lags behind its chemical reaction and the deterioration of cement soil are more serious under the condition of less cement ratio and longer buried time.Under the experimental conditions,the degradation depth of cement sample whose cement ratio is 15％ reached 3.5mm,5.8mm and 7.6mm after 1 year,2.5 years and 3.5 years respectively.Based on the experimental results,the prediction formula of degradation depth of cement soil is put forward.
展开▼
