纳米二氧化硅对橡胶粉再生混凝土坍落度和抗压性能的影响

屠艳平; 程子扬; 陈旭勇; 詹旭

doi:10.13204/j.gyjzG21032609

纳米二氧化硅对橡胶粉再生混凝土坍落度和抗压性能的影响

doi: 10.13204/j.gyjzG21032609

武汉工程大学土木工程与建筑学院, 武汉 430073

基金项目:

湖北省重大专项研发计划项目(2020BAB071)

武汉工程大学研究生教育创新基金项目(CX2020109)。

详细信息

作者简介:
屠艳平,女,1977年出生,副教授,博士。

通讯作者:
陈旭勇,男,1979年出生,教授,博士,Cxy1314kl@126.com。

计量
- 文章访问数: 78
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- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2021-03-26
- 网络出版日期: 2022-06-30
- 刊出日期: 2022-02-20

Effect of Nano-SiO₂ on Slump and Compressive Properties of Recycled Concrete with Rubber Powder

School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430073, China

摘要

摘要: 使用质量取代法研究纳米SiO₂(取代水泥)和橡胶粉(取代天然河沙)单掺和复掺对再生混凝土经7,28 d养护的抗压强度和坍落度的影响。通过试验结果发现:单掺橡胶时,随着橡胶粉掺量增加,再生混凝土的坍落度随之增大,当橡胶粉取代率达到5%时,再生混凝土的坍落度最大;单掺纳米SiO₂时,随着纳米SiO₂取代率的增加,再生混凝土的坍落度逐渐降低,取代率为3%时,再生混凝土的坍落度最小;单掺橡胶粉时,随着橡胶粉取代率的不断增加,经7 d养护的再生混凝土的抗压强度都随之降低,取代率低于5%时,经28 d养护的再生混凝土抗压强度得到提高;单掺纳米SiO₂时,随着取代率的不断增加,经7 d养护的再生混凝土的抗压强度随之增加;两者双掺时,既能弥补橡胶粉掺入强度的降低,又能抑制纳米SiO₂掺入后坍落度变差的缺点,达到互相弥补的作用。并通过扫描电镜对混凝土的形貌、过渡区和水化产物等微观结构进行了分析。
- 再生混凝土 /
- 橡胶粉 /
- 纳米SiO₂ /
- 坍落度 /
- 抗压强度
Abstract: The influence of Nano-SiO₂ (instead of cement) and rubber powder (instead of natural river sand) on compressive strength and slump of recycled concrete cured for 7 and 28 days was studied by the mass substitution method. Through the test results, it was found that the slump of recycled concrete increased with the increase of rubber powder proportion, and the slump of recycled concrete reached the maximum when the rubber powder proportion reached 5%. When adding nano-SiO₂, the slump of recycled concrete decreased with the increase of the Nano-SiO₂ content. When the proportion was 3%, the slump of recycled concrete was the smallest. When adding rubber powder, the 7th day compressive strength of recycled concrete decreased with the increase of rubber proportion, and the 28th day compressive strength increased when the rubber powder proportion was less than 5%. When nano-SiO₂ was added alone, the 7th day compressive strength of recycled concrete increased with the increase of Nano-SiO₂ proportion; when both of rubber powder and nano-SiO₂ were added together, it could not only make up for the decrease of rubber strength, but also restrain the slump deterioration after mixing with nano-SiO₂, offset the loss of strength by adding rubber powder, then, achieve a complementary effect. The microstructure, transition zone and hydration products of concrete were analyzed by scanning electron microscope.
- recycled concrete /
- rubber powder /
- nano-SiO₂ /
- slump /
- compressive strength

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参考文献(23)

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