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(1 中鐵建設(shè)集團(tuán)有限公司, 北京 100040; 2 北京工業(yè)大學(xué)城市建設(shè)學(xué)部, 北京 100124)

摘要: 以預(yù)拌混凝土企業(yè)生產(chǎn)的普通 C50 混凝土相關(guān)數(shù)據(jù)為基礎(chǔ),采用正交設(shè)計(jì)方法研究單方膠凝材料用量、砂率、機(jī)制砂與天然砂比例、粉煤灰與礦渣粉比例 4 個(gè)因素對(duì)自密實(shí)混凝土的強(qiáng)度和自密實(shí)性能的影響和變化規(guī)律.研究結(jié)果表明,機(jī)制砂的摻入對(duì)混凝土的自密實(shí)性能有不利影響;在水膠比不變的前提下,單方膠凝材料用量的增加對(duì)混凝土抗壓強(qiáng)度、自密實(shí)性能均有積極影響;篩選出了滿(mǎn)足施工技術(shù)參數(shù)要求的因素組合.

關(guān)鍵詞: 機(jī)制砂; 自密實(shí)混凝土; 膠凝材料用量; 砂率; 配合比; 正交設(shè)計(jì)方法

中圖分類(lèi)號(hào):TU528. 45 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)03-0019-04

DOI:10. 19701 / j. jzjg. LS210078

Design and application of C50 self-compacting concrete with machine-made sand

LI Yulong1,2

(1 China Railway Construction Group Co., Ltd., Beijing 100040, China;2 Department of Urban Construction, Beijing University of Technology, Beijing 100124, China)

Abstract: Based on the data related to ordinary C50 concrete produced by ready-mixed concrete enterprises, the orthogonaldesign method was used to study the influence and change law of the four factors of the amount of unilateral cementitiousmaterial dosage, sand ratio, ratio of machine-made sand to natural sand, and ratio of fly ash to slag powder on the strengthand self-compacting performance of self-compacting concrete. The research results show that the incorporation ofmachine-made sand has an adverse effect on the self-compacting performance of concrete; under the premise that thewater-binder ratio remains unchanged, the increase in the amount of unilateral cementitious material has a positive effect onthe compressive strength and self-compacting performance of concrete; and the combination of factors that meet therequirements of construction technical parameters was filtered out.

Keywords: machine-made sand; self-compacting concrete; amount of cementitious material; sand ratio; mix ratio;orthogonal design method

∗中鐵建設(shè)集團(tuán)有限公司科技研發(fā)課題( LX20-27b) .

第一作者:李玉龍,碩士研究生,工程師,一級(jí)注冊(cè)建造師,主要從事土木工程材料技術(shù)質(zhì)量管理工作,Email: yulonglee0617@163. com.

[引用本文] 李玉龍. 摻機(jī)制砂 C50 自密實(shí)混凝土設(shè)計(jì)及應(yīng)用[ J]. 建筑結(jié)構(gòu),2022,52( 3):19-22,29. LI Yulong.Design and application of C50 self-compacting concrete with machine-made sand[J]. Building Structure,2022,52(3):19-22,29.