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| 海洋环境下粉煤灰混凝土的抗冻性与抗氯离子渗透性的耦合 | |
| 引用本文： | 杨文武,黄煜镔,郭立杰.海洋环境下粉煤灰混凝土的抗冻性与抗氯离子渗透性的耦合[J].海洋科学,2009,33(12):83-88. |
| 作者姓名： | 杨文武 黄煜镔 郭立杰 |
| 作者单位： | 1. 大连民族学院,土木建筑工程学院,辽宁,大连,116600;重庆大学,材料科学与工程学院,重庆,400045 2. 重庆大学,土木学院,重庆,400045 3. 大连民族学院,土木建筑工程学院,辽宁,大连,116600 |
| 基金项目： | 国家自然科学基金项目 |
| 摘 要： | 针对海洋环境条件,重点研究了粉煤灰混凝土的抗冻性和氯离子渗透性能的相互关系.试验分别研究了水胶比、粉煤灰等量取代水泥掺量大小、引气剂掺量等因素对抗冻性和抗氯离子渗透性能的影响,并与普通混凝土进行了对比.结果表明,粉煤灰不增加混凝土的抗海水冻融耐久性;粉煤灰增加混凝土的抗氯离子渗透性能,但是掺量超过30%,抗氯离子渗透性能下降;粉煤灰对混凝土抗冻性和抗氯离子渗透性的耦合影响在30%左右存在一个最佳掺量.为评估混凝土的抗冻性和氯离子扩散性的耦合性能,提出了新的评价方法--冻渗比(R值方法),并进行了试验验证.SEM和MIP微观分析与R值方法评价的结果是吻合的. |
| 关 键 词： | 粉煤灰 海工混凝土 抗冻性 氯离子渗透 评价方法 |
| 收稿时间： | 2008/12/28 0:00:00 |
| 修稿时间： | 2009/4/16 0:00:00 |
Characteristics of frost resistance and resistance to chloride-ion penetration of fly ash concrete in a marine environment |
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| YANG Wen-wu,HUANG Yu-bin and GUO Li-jie.Characteristics of frost resistance and resistance to chloride-ion penetration of fly ash concrete in a marine environment[J].Marine Sciences,2009,33(12):83-88. | |
| Authors: | YANG Wen-wu HUANG Yu-bin and GUO Li-jie |
| Abstract: | The properties of fly ash (FA) concrete used at a marine environment were studied, especially the correlation between freeze-thaw durability and chloride-ion penetration properties. The factors such as water-cement ratio, FA alternative cement content equivalent, and air-entraining agent were experimentally studied and compared with the ordinary concrete (OPC). The results show that adding FA did not increase freeze-thaw durability of concrete; but increases its chloride ion impermeability when the content was less than 30% by mass, which is the best one of coupling properties of both frost-resistance and impermeability. While decreasing its impermeability more than 30%. the both properties were improved only in combination with FA and air entraining agent in concrete at sea water conditions. Furthermore, a new assessment method (R-value method) was brought forward to evaluate the performance of both freeze-thaw durability and chloride ions diffusion of various concretes in a marine environment and verified by an experimental study. SEM micrographs and MIP analyses coincided considerably with R-value method's conclusions. |
| Keywords: | fly ash marine concrete freeze-thaw durability chloride-ion penetration assessment method |
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