普通混凝土耐久性设计方法
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摘要
普通混凝土耐久性设计本质就是确定满足混凝土耐久性的水灰比和最小水泥用量。文中从耐久性分析入手 ,兼顾强度和耐久性两项指标 ,采用公式化方法直接对混凝土耐久性进行设计。该设计是以推导水灰比W/C、单位水泥用量C和混凝土强度fcu数学关系为基础 ,并通过分析将耐久性分为抗冻耐久性、碳化耐久性、酸根离子扩散耐久性以及耐磨耐久性 ,建立满足混凝土耐久性的水灰比的关系式 ,然后比较满足耐久性的水灰比和强度的水灰比且取小者 ,进而利用式 (4 )求得单位水泥用量
The essence of common concrete durability design is to determine the w/c ratio and the minmal,cement consumption that can meet the demand of concrete durability,This paper adopts the formula method to directly design the mixture ration of concrete by analyzing durability while considering both strength and durability.Based on the deduction of the mathematical relationships of w/c ratio,unit cement consumption and concrete strength.f cu ,the formula of w/c ratio is established that meets durability index.Then ,comparing w/c ratio that meets durability with w/c ratio that meets strength,the lower one is chosen to calculate unit cement dosage by formula(4).In this paper concrete durability is divided into frost resistance durability,carbonization durability,acid radical diffusion durability and grinding durability.
The essence of common concrete durability design is to determine the w/c ratio and the minmal,cement consumption that can meet the demand of concrete durability,This paper adopts the formula method to directly design the mixture ration of concrete by analyzing durability while considering both strength and durability.Based on the deduction of the mathematical relationships of w/c ratio,unit cement consumption and concrete strength.f cu ,the formula of w/c ratio is established that meets durability index.Then ,comparing w/c ratio that meets durability with w/c ratio that meets strength,the lower one is chosen to calculate unit cement dosage by formula(4).In this paper concrete durability is divided into frost resistance durability,carbonization durability,acid radical diffusion durability and grinding durability.
引文
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[7] [奥地利]H李默编.高性能砼的耐久性[M].科学出版社,1998,(3):119.
[8] 廉慧珍,路新瀛.按耐久性设计高性能混凝土的原则和方法[J].建筑技术,2001,(1):8～11.
[9] 乔生祥.水工混凝土缺陷检测和处理[M].中国水利水电出版社,1999,(3).
[2] 姚启均编译.钢筋混凝土结构耐久性预测[J].混凝土与水泥制品,1995,(2):58～59.
[3] 周新刚编著.混凝土结构的耐久性与损伤防治[M].中国建材工业出版社,1999,9.
[4] [苏]FO .M布然诺夫著,龚洛书译.混凝土工业学[M].中国建筑工业出版社,1985,(2):144.
[5] [英]P .Barnes著,吴兆琦,汪瑞芬,等译.水泥的结构和性能[M].中国建筑工业出版社,1991,4.
[6] 邱小坛,周燕编著.旧建筑物的检测加固与维护[M].北京:地震出版社,1992,(4):28.
[7] [奥地利]H李默编.高性能砼的耐久性[M].科学出版社,1998,(3):119.
[8] 廉慧珍,路新瀛.按耐久性设计高性能混凝土的原则和方法[J].建筑技术,2001,(1):8～11.
[9] 乔生祥.水工混凝土缺陷检测和处理[M].中国水利水电出版社,1999,(3).
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