高性能砼在高寒强侵蚀地区的应用研究
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摘要
新世纪混凝土材料的的发展战略就是增强混凝土的耐久性。人们对混凝土耐久性问题的认识主要是出于经济因素和安全因素的考虑。所以对混凝土工程来说,混凝土耐久性应该放在与力学性能、工程造价一样重要的位置。
混凝土耐久性与其所处环境是密切相关的,环境不同,混凝土耐久性的具体要求也不一样。新疆博斯腾湖东泵站工程属于塔里木河治理项目的首部枢纽工程,地处强侵蚀高寒高温差地区,东泵站环境镁离子Mg2+含量最大值1378.6mg/L,硫酸根离子SO42-含量最大值12728 mg/L,对混凝土结构具有强腐蚀性;博斯腾湖湖区最高气温39.2℃,最低气温-30.4℃,对混凝土抗冻有很高的要求,对高性能混凝土在高寒地区的施工工艺方面也提出更高的要求。
本文主要从理论和实践两方面开展高性能混凝土的研究,主要研究内容和方法如下:
⑴合理选择试验所用原材料和试验方法。为了更好地服务于新疆东泵站工程,本文以因地制宜、就地取材为原则,结合周边地区建筑材料的基本条件开展抗侵蚀研究。并选择适宜的试验方法对材料性能进行测试和分析。
⑵针对环境特点,结合生产工艺(如搅拌、运输、浇筑与养护等),从原材料组份、配合比设计以及控制原材料品质等方面着手进行高性能混凝土的配制工作。
⑶施工工艺的研究采用文献分析法,并进行现场应用,验证,数据分析论证。
文章得到如下结论:
⑴掺矿渣微粉的高性能混凝土具有优异的抗侵蚀性。水胶比愈小,高性能混凝土越密实,抗侵蚀性愈高;矿渣微粉掺量越多,侵蚀内因越少,高性能混凝土侵蚀性越好。
⑵东泵站抗侵蚀混凝土应采取矿渣微粉高性能混凝土,但其配合比的水胶比不得大于0.35,矿渣微粉掺量不得低于40%。
⑶掺矿渣微粉的高性能混凝土不仅抗侵蚀性高,而且同时具有高抗渗性、抗冻性、抑制混凝土骨料反应等耐久性。
⑷掺矿渣微粉的高性能混凝土不仅抗侵蚀性大大优于抗硫酸盐水泥混凝土,而且它的成本费用也低于抗硫酸盐水泥混凝土。
⑸现场应用证明,配制的高性能混凝土满足新疆高寒强侵蚀地区特点的施工需要。
⑹由于采用了高效减水剂,对于拌和用水量比较敏感,拌和用水必须精确称量,防止塌落度变化过大;浇筑后必须及时做好保温保湿养护,防止出收缩裂缝。
⑺高性能混凝土采用普通32.5水泥,可以得到高强、抗侵蚀混凝土,在新疆博斯腾湖东泵站高寒、强侵蚀地区得到很好应用,满足工程建设及运行环境的需要,获得了很好的经济效益和社会效益。高性能混凝土作为一项新技术,施工工艺的研究在国内尚处于研究、应用阶段,本文可以为同类工程所借鉴。
The development aim of concrete is that how to strengthen its endurance. People know the endurance of concrete mainly because of the consideration of economy and safety, so we think concrete endurance is as important as the mechanics capability and project cost for concrete project.
Concrete endurance is correlative tightly with its located environment. The environment is different and the requirement for endurance of concrete also is different. East pumping station of Bositen Lake in Xinjiang Province is the headwork of Talimu river improvement project.The site is located in the zone of huge corroding, extreme cold and huge difference in temperature. The max content of Mg2+ and SO42- are 1378.6mg/Land 12728 mg/L and all these are extreme corrosive for the concrete structure. The highest temperature can arrive at 39.2℃and the lowest temperature is -30.4℃in Bositen Lake site and the requirement of frost-resiting for high Performance concrete is very high as the construction technics.
In this article we’ll study high Performance concrete in the section of theory and practice and the major contents and method are as following.
⑴Rightly select raw materials and the method of testing. In order to build east pumping station of Bositen Lake better, we studied concrete corroding-resiting in consideration of the basic conditions of local construction materials and selected proper method to test and analyze the Performance of testing materials.
⑵According to this environment characteristic, we studied the mixture of high Performance concrete from its component, mix design and the quality of raw materials incorporated with the construction technics such as batching, transportation, pouring and curing.
⑶We adopted the method of literature-analyses to start the study of construction technics and test and applied in the site.
We gained the following conclusion through this study.
⑴High Performance concrete mixed slag powder has excellent Performance of frost-resiting. Water content is lower and the concrete is closer after vibrating. Similarly, the content of slag powder is higher and high Performance concrete has more excellent corroding-resiting.
⑵In this study we found high Performance concrete placed in east pumping-station should add slag powder and its content cannot be lower 40% but the water content cannot be higher than 0.35.
⑶The concrete mixed slag powder not only contains high corroding-resiting but also contains high seepage-risiting, frost-rsiting and the endurance of resiting of concrete aggregate reaction.
⑷High Performance concrete mixed slag powder not only obtains more excellent corroding-resiting but also its cost is lower than the concrete contained sulphate-resiting cement.
⑸The testing and application of high Performance mixed slag powder at the site proved that it can meet the construction request of the zone of extreme cold and huge corroding in Xinjiang province.
⑹The metage of the water mixed in concrete should be accurate after water-reducing agent added in the concrete and the change of concrete slump can not be too big. Effective measures of heat insulating and moisture retention for the concrete should be taken also to prevent contraction cracks appear.
⑺We usually use common cement of portland 32.5 in high Performance concrete production and this kind of concrete can effectively apply in the zone of extreme cold and huge corroding in east pumping station of Xinjiang Bositen lake area and we obtained huge economic benefit and social benefit through this testing and application. This article can be used for reference for similar project because construction technics of high Performance concrete is just on the phases of study and testing as a new technology in China.
混凝土耐久性与其所处环境是密切相关的,环境不同,混凝土耐久性的具体要求也不一样。新疆博斯腾湖东泵站工程属于塔里木河治理项目的首部枢纽工程,地处强侵蚀高寒高温差地区,东泵站环境镁离子Mg2+含量最大值1378.6mg/L,硫酸根离子SO42-含量最大值12728 mg/L,对混凝土结构具有强腐蚀性;博斯腾湖湖区最高气温39.2℃,最低气温-30.4℃,对混凝土抗冻有很高的要求,对高性能混凝土在高寒地区的施工工艺方面也提出更高的要求。
本文主要从理论和实践两方面开展高性能混凝土的研究,主要研究内容和方法如下:
⑴合理选择试验所用原材料和试验方法。为了更好地服务于新疆东泵站工程,本文以因地制宜、就地取材为原则,结合周边地区建筑材料的基本条件开展抗侵蚀研究。并选择适宜的试验方法对材料性能进行测试和分析。
⑵针对环境特点,结合生产工艺(如搅拌、运输、浇筑与养护等),从原材料组份、配合比设计以及控制原材料品质等方面着手进行高性能混凝土的配制工作。
⑶施工工艺的研究采用文献分析法,并进行现场应用,验证,数据分析论证。
文章得到如下结论:
⑴掺矿渣微粉的高性能混凝土具有优异的抗侵蚀性。水胶比愈小,高性能混凝土越密实,抗侵蚀性愈高;矿渣微粉掺量越多,侵蚀内因越少,高性能混凝土侵蚀性越好。
⑵东泵站抗侵蚀混凝土应采取矿渣微粉高性能混凝土,但其配合比的水胶比不得大于0.35,矿渣微粉掺量不得低于40%。
⑶掺矿渣微粉的高性能混凝土不仅抗侵蚀性高,而且同时具有高抗渗性、抗冻性、抑制混凝土骨料反应等耐久性。
⑷掺矿渣微粉的高性能混凝土不仅抗侵蚀性大大优于抗硫酸盐水泥混凝土,而且它的成本费用也低于抗硫酸盐水泥混凝土。
⑸现场应用证明,配制的高性能混凝土满足新疆高寒强侵蚀地区特点的施工需要。
⑹由于采用了高效减水剂,对于拌和用水量比较敏感,拌和用水必须精确称量,防止塌落度变化过大;浇筑后必须及时做好保温保湿养护,防止出收缩裂缝。
⑺高性能混凝土采用普通32.5水泥,可以得到高强、抗侵蚀混凝土,在新疆博斯腾湖东泵站高寒、强侵蚀地区得到很好应用,满足工程建设及运行环境的需要,获得了很好的经济效益和社会效益。高性能混凝土作为一项新技术,施工工艺的研究在国内尚处于研究、应用阶段,本文可以为同类工程所借鉴。
The development aim of concrete is that how to strengthen its endurance. People know the endurance of concrete mainly because of the consideration of economy and safety, so we think concrete endurance is as important as the mechanics capability and project cost for concrete project.
Concrete endurance is correlative tightly with its located environment. The environment is different and the requirement for endurance of concrete also is different. East pumping station of Bositen Lake in Xinjiang Province is the headwork of Talimu river improvement project.The site is located in the zone of huge corroding, extreme cold and huge difference in temperature. The max content of Mg2+ and SO42- are 1378.6mg/Land 12728 mg/L and all these are extreme corrosive for the concrete structure. The highest temperature can arrive at 39.2℃and the lowest temperature is -30.4℃in Bositen Lake site and the requirement of frost-resiting for high Performance concrete is very high as the construction technics.
In this article we’ll study high Performance concrete in the section of theory and practice and the major contents and method are as following.
⑴Rightly select raw materials and the method of testing. In order to build east pumping station of Bositen Lake better, we studied concrete corroding-resiting in consideration of the basic conditions of local construction materials and selected proper method to test and analyze the Performance of testing materials.
⑵According to this environment characteristic, we studied the mixture of high Performance concrete from its component, mix design and the quality of raw materials incorporated with the construction technics such as batching, transportation, pouring and curing.
⑶We adopted the method of literature-analyses to start the study of construction technics and test and applied in the site.
We gained the following conclusion through this study.
⑴High Performance concrete mixed slag powder has excellent Performance of frost-resiting. Water content is lower and the concrete is closer after vibrating. Similarly, the content of slag powder is higher and high Performance concrete has more excellent corroding-resiting.
⑵In this study we found high Performance concrete placed in east pumping-station should add slag powder and its content cannot be lower 40% but the water content cannot be higher than 0.35.
⑶The concrete mixed slag powder not only contains high corroding-resiting but also contains high seepage-risiting, frost-rsiting and the endurance of resiting of concrete aggregate reaction.
⑷High Performance concrete mixed slag powder not only obtains more excellent corroding-resiting but also its cost is lower than the concrete contained sulphate-resiting cement.
⑸The testing and application of high Performance mixed slag powder at the site proved that it can meet the construction request of the zone of extreme cold and huge corroding in Xinjiang province.
⑹The metage of the water mixed in concrete should be accurate after water-reducing agent added in the concrete and the change of concrete slump can not be too big. Effective measures of heat insulating and moisture retention for the concrete should be taken also to prevent contraction cracks appear.
⑺We usually use common cement of portland 32.5 in high Performance concrete production and this kind of concrete can effectively apply in the zone of extreme cold and huge corroding in east pumping station of Xinjiang Bositen lake area and we obtained huge economic benefit and social benefit through this testing and application. This article can be used for reference for similar project because construction technics of high Performance concrete is just on the phases of study and testing as a new technology in China.
引文
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