CAJ | 학술논문

研究了采用湿棉絮覆盖、喷养护剂、塑料薄膜密封3种养护措施对混凝土强度、收缩、中心温升、氯离子渗透性的影响,并通过不同龄期强度、氯离子渗透深度(5%NaCl溶液介质,质量分数)、钢筋腐蚀电位、加速腐蚀保护层开裂时间研究湿养护时间(1,7,14d和28d)对未掺和掺矿渣(等量取代水泥40%,质量分数)混凝土强度、抗渗性、护筋性的影响.结果表明:合适的养护措施能有效提高混凝土强度和抗渗性,降低水化温升和早期收缩.对未掺与掺矿渣的混凝土,更长的湿养护有助发展更高强度、耐久性和护筋性;而不充分养护导致混凝土较差的抗渗性和护筋性,该影响对掺矿渣混凝土尤为明显.7d湿养护对掺矿渣混凝土发展更高的潜在抗渗性是不够的.
연구료채용습면서복개、분양호제、소료박막밀봉3충양호조시대혼응토강도、수축、중심온승、록리자삼투성적영향,병통과불동령기강도、록리자삼투심도(5%NaCl용액개질,질량분수)、강근부식전위、가속부식보호층개렬시간연구습양호시간(1,7,14d화28d)대미참화참광사(등량취대수니40%,질량분수)혼응토강도、항삼성、호근성적영향.결과표명:합괄적양호조시능유효제고혼응토강도화항삼성,강저수화온승화조기수축.대미참여참광사적혼응토,경장적습양호유조발전경고강도、내구성화호근성;이불충분양호도치혼응토교차적항삼성화호근성,해영향대참광사혼응토우위명현.7d습양호대참광사혼응토발전경고적잠재항삼성시불구적.
Three curing methods were used for concrete curing with wet cotton mats, a curing agent and plastic film. The strength, shrinkage, central temperature and chloride permeability under various curing methods were studied. The effect of wet curing duration (1, 7, 14 and 28 d) on the strength, impermeability and corrosion resistance for protecting internal reinforcement of plain and slag-cement concrete (in which 40% (in mass) cement was replaced by blast furnace slag) was studied by experiments including strength, chloride penetration depth immersed in 5% (in mass) NaCl solution, half-cell potential and concrete cover cracking time in accelerated corrosion. The results show the proper curing methods can effectively increase the strength, reduce the central temperature due to hydration heat and the early shrinkage strain and improve the chloride impermeability. Longer wet curing duration is essential to achieve higher strength, durability and corrosion resistance characteristics while inadequate wet curing resulted in poorer chloride impermeability and corrosion resistance for both plain and slag cement concrete, but especially for slag cement concrete. The plain cement concrete is relatively more tolerant to inadequate curing. The higher potential chloride penetration resistance can not be activated later in the natural environment if wet curing was ceased on the 7th day.