混凝土
混凝土
혼응토
CONCRETE
2014年
10期
20-25,30
,共7页
混凝土%碳化深度%矿物掺合料%相对湿度%温度
混凝土%碳化深度%礦物摻閤料%相對濕度%溫度
혼응토%탄화심도%광물참합료%상대습도%온도
concrete%carbonation depth%mineral admixtures%relative humidity%temperature
考虑矿物掺合料种类和掺量的影响，结合混凝土中CO2的扩散规律以及可碳化物质的质量守恒定律，以CO2扩散系数、碳化反应速率系数和混凝土中可碳化物质的量为控制参数，研究建立了矿物掺合料混凝土碳化分析的非线性多场耦合模型，并利用试验数据进行了对比验证。首先基于水泥水化、矿物掺合料二次水化以及混凝土碳化的机理，结合Fick第二定律和化学反应平衡方程，建立了矿物掺合料混凝土碳化分析的非线性多场耦合模型；然后考虑温度、相对湿度、水胶比以及矿物掺合料种类和掺量等因素的影响，提出了模型中CO2扩散系数、碳化反应速率系数、可碳化物质的量等控制参数的计算公式；最后利用加速碳化试验数据对比验证了该模型的有效性，并结合混凝土中CO2、可碳化物质和pH值的分布规律，揭示了温度、相对湿度、水胶比、矿物掺合料种类和掺量等因素对混凝土碳化深度的影响规律。
攷慮礦物摻閤料種類和摻量的影響，結閤混凝土中CO2的擴散規律以及可碳化物質的質量守恆定律，以CO2擴散繫數、碳化反應速率繫數和混凝土中可碳化物質的量為控製參數，研究建立瞭礦物摻閤料混凝土碳化分析的非線性多場耦閤模型，併利用試驗數據進行瞭對比驗證。首先基于水泥水化、礦物摻閤料二次水化以及混凝土碳化的機理，結閤Fick第二定律和化學反應平衡方程，建立瞭礦物摻閤料混凝土碳化分析的非線性多場耦閤模型；然後攷慮溫度、相對濕度、水膠比以及礦物摻閤料種類和摻量等因素的影響，提齣瞭模型中CO2擴散繫數、碳化反應速率繫數、可碳化物質的量等控製參數的計算公式；最後利用加速碳化試驗數據對比驗證瞭該模型的有效性，併結閤混凝土中CO2、可碳化物質和pH值的分佈規律，揭示瞭溫度、相對濕度、水膠比、礦物摻閤料種類和摻量等因素對混凝土碳化深度的影響規律。
고필광물참합료충류화참량적영향，결합혼응토중CO2적확산규률이급가탄화물질적질량수항정률，이CO2확산계수、탄화반응속솔계수화혼응토중가탄화물질적량위공제삼수，연구건립료광물참합료혼응토탄화분석적비선성다장우합모형，병이용시험수거진행료대비험증。수선기우수니수화、광물참합료이차수화이급혼응토탄화적궤리，결합Fick제이정률화화학반응평형방정，건립료광물참합료혼응토탄화분석적비선성다장우합모형；연후고필온도、상대습도、수효비이급광물참합료충류화참량등인소적영향，제출료모형중CO2확산계수、탄화반응속솔계수、가탄화물질적량등공제삼수적계산공식；최후이용가속탄화시험수거대비험증료해모형적유효성，병결합혼응토중CO2、가탄화물질화pH치적분포규률，게시료온도、상대습도、수효비、광물참합료충류화참량등인소대혼응토탄화심도적영향규률。
Considering the influences of the type and quantity of the mineral admixtures ,a nonlinear multi-field coupled model for car-bonation analysis of concrete with mineral admixtures was established and verified by combining the rule of diffusion of CO 2 within con-crete with the law of conservation of mass for carbonatable substances.The diffusion coefficient of CO 2,the coefficient of reaction rate be-tween CO2 and carbonatable substances,and the kind and dosage of the carbonatable substances were adopted as the governing parameters in the proposed model.According to the Fick's second law of diffusion and the balance chemical equations ,a nonlinear multi-field coupled model for carbonation analysis of concrete with mineral admixtures was established based on the mechanism of cement hydration ,second hydration of minerals and concrete carbonation first.Then,computation expressions of model parameters,such as the diffusion coefficient of CO2 within concrete,the coefficient of reaction rate between CO2 and carbonatable substances,and the amount of the carbonatable sub-stances,were developed by taking into account the influences of the temperature,relative humidity,water to binder ratio,and mineral ad-mixtures on carbonation.The proposed model was verified by comparing with experimental data and the influences of the temperature ,rel-ative humidity,water to binder ratio and mineral admixtures on carbonation depth were quantificationally investigated based on the distri-bution of CO2,carbonatable substances and the pH value within the concrete.
