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宋少民，王毅

（ 北京建筑大學(xué) ，建筑結(jié)構(gòu)與環(huán)境修復(fù)功能材料北京市重點(diǎn)試驗(yàn)室 ，北京 100044)

摘   要 ：為了探究機(jī)制砂片狀顆粒的定義及其條形篩篩孔寬度是否有優(yōu)化的可能性，通過改變條形篩篩孔 寬度的條形篩與國(guó)標(biāo)條形篩  (0. 45 倍篩）對(duì)比 ，研究 0. 55 倍 、0. 60 倍條形篩的片狀顆粒檢出率 ；條形篩篩除片狀顆粒后，規(guī)則顆粒對(duì)膠砂性能的影響；明確最合適的條形篩篩孔寬度。結(jié)果表明：篩孔寬度為機(jī)制砂顆粒 所屬粒徑范圍平均粒徑0. 55 倍的條形篩  (0. 55 倍篩） 相比于國(guó)標(biāo)條形孔篩  (0. 45 倍篩）篩分效率高 ，片狀顆粒評(píng)價(jià)更合理，其規(guī)則顆粒對(duì)膠砂和混凝土性能最有利；相應(yīng)Ⅰ類機(jī)制砂的片狀顆粒含量宜控制在20%以內(nèi)。

關(guān)鍵詞：機(jī)制砂 ；片狀顆粒 ；條形篩 ；膠砂性能 ；混凝土性能 ；篩孔寬度

中圖分類號(hào)：TU528 . 041            

文獻(xiàn)標(biāo)志碼：A            

文章編號(hào)： 1005- 8249  (2024)  05- 0032- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .007

SONG Shaomin ,  WANG Yi

(Beijing Key Laboratory of Building Structure and Environmental Remediation Functional Materials ,

Beijing University of Civil Engineering and Architecture ,  Beijing 100044 ,  China)

Abstract: This article aims to explore the definition of mechanism sand like particles and whether there is a possibility of optimizing the width of the strip sieve holes. By changing the width of the strip sieve holes, a comparative study was conducted between the modified strip sieve and the national standard strip sieve (0.45x sieve) to investigate the detection rate of flake particles in the strip sieve and the effect of regular particles on the performance of the adhesive sand after removing flake particles. Based on the experimental results, the most suitable width of the strip sieve holes was determined. The results showed that a strip sieve with a mesh width of 0.55 times the average particle size range of the mechanism sand particles (0.55 times sieve) had higher screening efficiency compared to the national standard strip sieve (0.45 times sieve), and the evaluation of flake particles was more reasonable. Its regular particles were most beneficial to the performance of the binder and concrete; The threshold for the content of flake particles in corresponding Class I mechanism sand should be controlled within 20%.

Keywords: machine-made sand; flaky particles; bar screen; mortar performance; concrete performance; mesh width;

作者簡(jiǎn)介：宋少民(1965—) , 男，碩士 ，教授，研究方向： 高性能混凝土材料。

通信作者： 王   毅(1998—) , 男 ，碩士研究生，研究方向：建筑材料。

收稿日期：2024- 03- 01