中国港湾建设
中國港灣建設
중국항만건설
CHINA HARBOUR ENGINEERING
2014年
3期
26-30
,共5页
吕卫清%黎鹏平%熊建波%王胜年
呂衛清%黎鵬平%熊建波%王勝年
려위청%려붕평%웅건파%왕성년
混凝土成熟度%氯离子扩散系数%相关性%沉管隧道
混凝土成熟度%氯離子擴散繫數%相關性%沉管隧道
혼응토성숙도%록리자확산계수%상관성%침관수도
concrete maturity value%chloride diffusion coefficient%correlation%immersed tube tunnel
采用化学结合水法、氯离子快速测定法(RCM法)和混凝土成熟度测定法研究了56 d龄期内混凝土氯离子扩散系数和混凝土成熟度的关系。结果表明:混凝土氯离子扩散系数不仅随养护龄期的延长而降低,还随养护温度的升高而降低,延长养护龄期或提高养护温度均可提高胶凝材料的水化程度;室内养护混凝土试件的氯离子扩散系数与混凝土成熟度值之间呈幂函数关系,二者具有很好的相关性(R2=0.976),利用室外养护混凝土试件的数据进行验证计算,其理论计算值与实测值具有较好的吻合性,可根据混凝土成熟度实测值预测出混凝土的氯离子扩散系数;在本工程中,沉管隧道接触海水时混凝土成熟度的推荐值为21064℃·h,控制边界值为13926℃·h,考虑外部养护温度和水化热对混凝土成熟度产生影响时,可对混凝土接触海水的龄期通过后计算进行适当的调整。
採用化學結閤水法、氯離子快速測定法(RCM法)和混凝土成熟度測定法研究瞭56 d齡期內混凝土氯離子擴散繫數和混凝土成熟度的關繫。結果錶明:混凝土氯離子擴散繫數不僅隨養護齡期的延長而降低,還隨養護溫度的升高而降低,延長養護齡期或提高養護溫度均可提高膠凝材料的水化程度;室內養護混凝土試件的氯離子擴散繫數與混凝土成熟度值之間呈冪函數關繫,二者具有很好的相關性(R2=0.976),利用室外養護混凝土試件的數據進行驗證計算,其理論計算值與實測值具有較好的吻閤性,可根據混凝土成熟度實測值預測齣混凝土的氯離子擴散繫數;在本工程中,沉管隧道接觸海水時混凝土成熟度的推薦值為21064℃·h,控製邊界值為13926℃·h,攷慮外部養護溫度和水化熱對混凝土成熟度產生影響時,可對混凝土接觸海水的齡期通過後計算進行適噹的調整。
채용화학결합수법、록리자쾌속측정법(RCM법)화혼응토성숙도측정법연구료56 d령기내혼응토록리자확산계수화혼응토성숙도적관계。결과표명:혼응토록리자확산계수불부수양호령기적연장이강저,환수양호온도적승고이강저,연장양호령기혹제고양호온도균가제고효응재료적수화정도;실내양호혼응토시건적록리자확산계수여혼응토성숙도치지간정멱함수관계,이자구유흔호적상관성(R2=0.976),이용실외양호혼응토시건적수거진행험증계산,기이론계산치여실측치구유교호적문합성,가근거혼응토성숙도실측치예측출혼응토적록리자확산계수;재본공정중,침관수도접촉해수시혼응토성숙도적추천치위21064℃·h,공제변계치위13926℃·h,고필외부양호온도화수화열대혼응토성숙도산생영향시,가대혼응토접촉해수적령기통과후계산진행괄당적조정。
The correlation of chloride diffusion coefficient and concrete maturity value within 56 days of curing was investigated by the chemically combined water content method, rapid chloride migration(RCM) test and concrete maturity test, respectively. The experimental results showed the chloride diffusion coefficient of concretes decreased with increasing curing ages and curing temperature, which can promote the hydration degree of cementious. There was a significant correlation between the chloride diffusion coefficient of indoor curing specimens and the concrete maturity value when expressed as a power function (R2=0.976), and the calculated values of concrete maturity for outdoor specimens which obtained by using the power function agrees well with the measured values, then it can use the measured concrete maturity value to predict the chloride diffusion coefficient of concrete. The recommended value and the control value of concrete maturity was 21 064 ℃·h and 13 926℃·h, when the immersed tube tunnels were placed in seawater. Furthermore, the ages of the tunnels placed in seawater can be appropriately adjusted by calculation when considering the external curing temperature and heat of hydration of cementious.