苏州混凝土水泥制品研究院有限公司

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发布时间:2020-01-06 00:00:00
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扰动对混凝土抗氯离子渗透性能的影响研究
Research on the Chloride Migration Coefficient Evolution of Concrete After Being Disturbed
2020年第10期
三维扰动;抗扰动剂;耐久性能;RCM值
Three dimension vibration; Disturbance resistance agent; Durable performance; Rapid chloride ions migration coefficient
2020年第10期
10.19761/j.1000-4637.2020.10.027.04
江苏省重点研发计划项目(BE2017158);南京市科技计划项目(201727002);江苏省住房和城乡建设厅科技项目(2018JH017);江苏省自然科学基金项目(BK20171111、 BK20181127);六大人才高峰项目(XCL-115);江苏省科协青年科技人才托举工程项目。
谢德擎1,2,穆 松1,2,刘建忠1,2,石 亮3,刘 凯1,2,刘光严1,2
1.高性能土木工程材料国家重点实验室,江苏 南京 210008;2.江苏苏博特新材料股份有限公司,江苏 南京 211103;3.上海苏科建筑技术发展有限公司,上海 201399

谢德擎1,2,穆 松1,2,刘建忠1,2,石 亮3,刘 凯1,2,刘光严1,2

摘   要:利用改造后的击顶式振筛机提供三维扰动,通过线切割内部偏心顶轴,使竖向振幅接近南京长江大桥公路桥桥面的实际振幅;配制C30、C50普通混凝土和掺抗扰动剂的C50混凝土,设计7种扰动制度,研究了各扰动制度对混凝土抗氯离子渗透性能(RCM)的影响。研究结果表明:C30混凝土终凝前1 h受扰动,上部试块RCM值增幅最大,增幅为70.4%;C50混凝土终凝时受扰动,上部试块RCM值增幅最大,增幅为95%;该阶段混凝土的可塑性基本消失,受扰动后局部密实度降低,RCM值增大明显。掺入抗扰动剂可以实现混凝土“初期增稠”与“早期增强”,大幅提升普通混凝土的整体抗扰动性能,相比于自身未扰动组,受各扰动制度后RCM值几乎没有降低。

Abstract: Using the modified test-sieving machine to provide three-dimensional disturbance, the vibration amplitudes were close to the actual amplitudes of the road bridge deck of Nanjing Yangtze river bridge by cutting the internal eccentric top shaft. Seven disturbance systems were designed to study the influence on rapid chloride ions migration coefficient (RCM) of C30、C50 ordinary concrete and C50 anti-disturbance concrete. The study results show that when C30 ordinary concrete is disturbed at 1 h before the final setting, the RCM value of upper block increases the most with an increase by 70.4%. When C50 ordinary concrete is disturbed at the final setting, the RCM value of the upper block increases the most, by 95%. At these stage, the plasticity of concrete basically disappears, leading to a decrease in compactness and a significant increase in RCM value. Adding disturbance resistance agent, the concrete can achieve       "initial thickening" and "early strengthening", and improve the overall anti-disturbance performance. The RCM values before and after disturbance are almost the same.

谢德擎,穆松,刘建忠,等.扰动对混凝土抗氯离子渗透性能的影响研究[J].混凝土与水泥制品,2020(10):27-30.

XIE D Q,MU S,LIU J Z.Research on the Chloride Migration Coefficient Evolution of Concrete After Being Disturbed[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):27-30.

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摘   要:利用改造后的击顶式振筛机提供三维扰动,通过线切割内部偏心顶轴,使竖向振幅接近南京长江大桥公路桥桥面的实际振幅;配制C30、C50普通混凝土和掺抗扰动剂的C50混凝土,设计7种扰动制度,研究了各扰动制度对混凝土抗氯离子渗透性能(RCM)的影响。研究结果表明:C30混凝土终凝前1 h受扰动,上部试块RCM值增幅最大,增幅为70.4%;C50混凝土终凝时受扰动,上部试块RCM值增幅最大,增幅为95%;该阶段混凝土的可塑性基本消失,受扰动后局部密实度降低,RCM值增大明显。掺入抗扰动剂可以实现混凝土“初期增稠”与“早期增强”,大幅提升普通混凝土的整体抗扰动性能,相比于自身未扰动组,受各扰动制度后RCM值几乎没有降低。 Abstract: Using the modified test-sieving machine to provide three-dimensional disturbance, the vibration amplitudes were close to the actual amplitudes of the road bridge deck of Nanjing Yangtze river bridge by cutting the internal eccentric top shaft. Seven disturbance systems were designed to study the influence on rapid chloride ions migration coefficient (RCM) of C30、C50 ordinary concrete and C50 anti-disturbance concrete. The study results show that when C30 ordinary concrete is disturbed at 1 h before the final setting, the RCM value of upper block increases the most with an increase by 70.4%. When C50 ordinary concrete is disturbed at the final setting, the RCM value of the upper block increases the most, by 95%. At these stage, the plasticity of concrete basically disappears, leading to a decrease in compactness and a significant increase in RCM value. Adding disturbance resistance agent, the concrete can achieve       "initial thickening" and "early strengthening", and improve the overall anti-disturbance performance. The RCM values before and after disturbance are almost the same.
英文名 : Research on the Chloride Migration Coefficient Evolution of Concrete After Being Disturbed
刊期 : 2020年第10期
关键词 : 三维扰动;抗扰动剂;耐久性能;RCM值
Key words : Three dimension vibration; Disturbance resistance agent; Durable performance; Rapid chloride ions migration coefficient
刊期 : 2020年第10期
DOI : 10.19761/j.1000-4637.2020.10.027.04
文章编号 :
基金项目 : 江苏省重点研发计划项目(BE2017158);南京市科技计划项目(201727002);江苏省住房和城乡建设厅科技项目(2018JH017);江苏省自然科学基金项目(BK20171111、 BK20181127);六大人才高峰项目(XCL-115);江苏省科协青年科技人才托举工程项目。
作者 : 谢德擎1,2,穆 松1,2,刘建忠1,2,石 亮3,刘 凯1,2,刘光严1,2
单位 : 1.高性能土木工程材料国家重点实验室,江苏 南京 210008;2.江苏苏博特新材料股份有限公司,江苏 南京 211103;3.上海苏科建筑技术发展有限公司,上海 201399

谢德擎1,2,穆 松1,2,刘建忠1,2,石 亮3,刘 凯1,2,刘光严1,2

摘   要:利用改造后的击顶式振筛机提供三维扰动,通过线切割内部偏心顶轴,使竖向振幅接近南京长江大桥公路桥桥面的实际振幅;配制C30、C50普通混凝土和掺抗扰动剂的C50混凝土,设计7种扰动制度,研究了各扰动制度对混凝土抗氯离子渗透性能(RCM)的影响。研究结果表明:C30混凝土终凝前1 h受扰动,上部试块RCM值增幅最大,增幅为70.4%;C50混凝土终凝时受扰动,上部试块RCM值增幅最大,增幅为95%;该阶段混凝土的可塑性基本消失,受扰动后局部密实度降低,RCM值增大明显。掺入抗扰动剂可以实现混凝土“初期增稠”与“早期增强”,大幅提升普通混凝土的整体抗扰动性能,相比于自身未扰动组,受各扰动制度后RCM值几乎没有降低。

Abstract: Using the modified test-sieving machine to provide three-dimensional disturbance, the vibration amplitudes were close to the actual amplitudes of the road bridge deck of Nanjing Yangtze river bridge by cutting the internal eccentric top shaft. Seven disturbance systems were designed to study the influence on rapid chloride ions migration coefficient (RCM) of C30、C50 ordinary concrete and C50 anti-disturbance concrete. The study results show that when C30 ordinary concrete is disturbed at 1 h before the final setting, the RCM value of upper block increases the most with an increase by 70.4%. When C50 ordinary concrete is disturbed at the final setting, the RCM value of the upper block increases the most, by 95%. At these stage, the plasticity of concrete basically disappears, leading to a decrease in compactness and a significant increase in RCM value. Adding disturbance resistance agent, the concrete can achieve       "initial thickening" and "early strengthening", and improve the overall anti-disturbance performance. The RCM values before and after disturbance are almost the same.

谢德擎,穆松,刘建忠,等.扰动对混凝土抗氯离子渗透性能的影响研究[J].混凝土与水泥制品,2020(10):27-30.

XIE D Q,MU S,LIU J Z.Research on the Chloride Migration Coefficient Evolution of Concrete After Being Disturbed[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):27-30.

摘要
参数
结论
参考文献
引用本文

摘   要:利用改造后的击顶式振筛机提供三维扰动,通过线切割内部偏心顶轴,使竖向振幅接近南京长江大桥公路桥桥面的实际振幅;配制C30、C50普通混凝土和掺抗扰动剂的C50混凝土,设计7种扰动制度,研究了各扰动制度对混凝土抗氯离子渗透性能(RCM)的影响。研究结果表明:C30混凝土终凝前1 h受扰动,上部试块RCM值增幅最大,增幅为70.4%;C50混凝土终凝时受扰动,上部试块RCM值增幅最大,增幅为95%;该阶段混凝土的可塑性基本消失,受扰动后局部密实度降低,RCM值增大明显。掺入抗扰动剂可以实现混凝土“初期增稠”与“早期增强”,大幅提升普通混凝土的整体抗扰动性能,相比于自身未扰动组,受各扰动制度后RCM值几乎没有降低。

Abstract: Using the modified test-sieving machine to provide three-dimensional disturbance, the vibration amplitudes were close to the actual amplitudes of the road bridge deck of Nanjing Yangtze river bridge by cutting the internal eccentric top shaft. Seven disturbance systems were designed to study the influence on rapid chloride ions migration coefficient (RCM) of C30、C50 ordinary concrete and C50 anti-disturbance concrete. The study results show that when C30 ordinary concrete is disturbed at 1 h before the final setting, the RCM value of upper block increases the most with an increase by 70.4%. When C50 ordinary concrete is disturbed at the final setting, the RCM value of the upper block increases the most, by 95%. At these stage, the plasticity of concrete basically disappears, leading to a decrease in compactness and a significant increase in RCM value. Adding disturbance resistance agent, the concrete can achieve       "initial thickening" and "early strengthening", and improve the overall anti-disturbance performance. The RCM values before and after disturbance are almost the same.

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(1)C30、C50普通混凝土未受扰动时,上中下三个试块的RCM值相差不大。受各扰动制度的测试结果显示:C30混凝土终凝前1 h受扰动,上部试块RCM值增幅最大,增幅为70.4%;C50混凝土终凝时受扰动,上部试块RCM值增幅最大,增幅为95%;考虑测试前切除了顶部25 mm部分,判断扰动引起的损伤主要集中在顶部75 mm。
(2)混凝土抗扰动剂兼具“初期增稠”与“早期增强”双重作用,提升混凝土的抗扰动性能。相比于基准混凝土,掺入混凝土抗扰动剂略微降低未扰动组的密实度,但可有效抵御持续扰动引起的负面作用,抗扰动剂组混凝土试块的RCM值均远小于基准组受扰动后RCM最大值,并且波动性很小。

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谢德擎,穆松,刘建忠,等.扰动对混凝土抗氯离子渗透性能的影响研究[J].混凝土与水泥制品,2020(10):27-30.

XIE D Q,MU S,LIU J Z.Research on the Chloride Migration Coefficient Evolution of Concrete After Being Disturbed[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):27-30.

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