再生微粉混凝土抗冻性能试验研究

赵世颖; 李滢; 康晓明; 樊耀虎

doi:10.13204/j.gyjzG19122606

再生微粉混凝土抗冻性能试验研究

doi: 10.13204/j.gyjzG19122606

青海大学土木工程学院, 西宁 810016

基金项目:

国家自然科学基金资助项目（51668052）；青海省科技厅科技基础条件平台（2018-ZJ-T01）。

详细信息

作者简介:
赵世颖,女,1995年出生,硕士研究生。

通讯作者:
李滢,liying.qh@163.com。

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- 文章访问数: 145
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- 被引次数: 0
出版历程
- 收稿日期: 2019-12-26
- 网络出版日期: 2021-03-31

EXPERIMENTAL STUDY ON FROST RESISTANCE OF RECYCLED FINE POWDER CONCRETE

School of Civil Engineering, Qinghai University, Xining 810016, China

摘要

摘要: 建筑垃圾再利用生产再生骨料的过程中产生了大量粒径小于0.16 mm的细小微粒（即再生微粉），这部分颗粒具有一定的活性，可以作为矿物掺料取代水泥掺入混凝土中。通过将再生微粉以10%、20%、30%、40%的取代率替代水泥，研究再生微粉取代率、水胶比等因素对再生微粉混凝土的力学及抗冻性能的影响，并与等量粉煤灰替代水泥制备的粉煤灰混凝土作对比研究。研究表明：再生微粉掺量增加时，再生微粉混凝土抗压强度不断降低，但抗冻性能的变化规律刚好相反。水胶比为0.35时，再生微粉混凝土的抗压强度及抗冻性能均略高；同等条件下，再生微粉混凝土的抗冻性能优于普通混凝土和粉煤灰混凝土；当水灰比为0.35、再生微粉掺量为30%时，再生微粉混凝土的抗冻性最好，冻融循环次数可达175次。
- 再生微粉 /
- 再生微粉混凝土 /
- 抗压强度 /
- 抗冻性 /
- 压汞法
Abstract: In the process of recycling construction waste to produce recycled aggregate, a large number of small particles with particle size less than 0.16 mm, namely recycled micro powder, are produced. These particles have certain activity and can be added into concrete as mineral admixture instead of cement. 10%, 20%, 30% and 40% replacement rates of recycled fine powder were used to replace cement to study the influence of such factors as replacement rate of recycled fine powder and water-binder ratio on the mechanical and frost resistance of recycled fine powder concrete, and to make a comparative study with fly ash concrete prepared by replacing cement with equivalent amount of fly ash. The results showed that the compressive strength of recycled fine powder concrete decreased with the increase of the content of recycled micro powder, but the law of frost resistance was just the opposite. When the water-binder ratio was 0.35, the compressive strength and frost resistance of the recycled fine powder concrete were slightly higher. Under the same conditions, the frost resistance of recycled fine-powder concrete was better than that of ordinary concrete and fly ash concrete. When the water-cement ratio was 0.35 and the recycled fine powder content was 30%, the recycled fine powder concrete had the best frost resistance, and the freeze-thaw cycle could reach 175 times.
- recycled fine power /
- recycled fine power concrete /
- compressive strength /
- frost resistance /
- mercury intrusion method

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