- 摘 要
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（鄭州大學(xué)綜合設(shè)計(jì)研究院有限公司， 鄭州 450002）
［摘要］為研究采用機(jī)制砂配制高強(qiáng)混凝土的力學(xué)性能，對機(jī)制砂替代率為30%～100%、強(qiáng)度等級C60以上混凝土進(jìn)行了不同齡期的立方體和棱柱體抗壓強(qiáng)度、劈裂抗拉強(qiáng)度和彈性模量試驗(yàn)。分析了機(jī)制砂替代率對混凝土強(qiáng)度、棱柱體與立方體抗壓強(qiáng)度比值以及彈性模量的影響。結(jié)果表明，在其他材料和用水量相同條件下，用機(jī)制砂部分或全部替代天然砂的混凝土強(qiáng)度和彈性模量均有所提高；棱柱體與立方體抗壓強(qiáng)度比值仍可按現(xiàn)行《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GB 50010—2010）的相關(guān)公式計(jì)算。同時(shí)，通過試驗(yàn)數(shù)據(jù)的回歸分析，提出了考慮機(jī)制砂替代率影響的彈性模量計(jì)算公式，該公式的計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好。
［關(guān)鍵詞］機(jī)制砂； 替代率； 混凝土強(qiáng)度等級； 彈性模量
中圖分類號：TU528-31文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)15-0096-04
Experimental study on strength and elastic modulus of high strength concrete with machine-made sand
LIU Jiahui, LIU Lixin
(Zhengzhou University Comprehensive Design and Research Institute Co., Ltd., Zhengzhou 450002, China)
Abstract:In order to study the mechanical properties of high strength concrete with machine-made sand, tests for the cubic and prism compressive strength, the splitting tensile strength and elastic modulus of concrete with strength grade above C60 and the replacement ratio of machine-made sand from 30% to 100% were carried out. The influence of the replacement ratio of machine-made sand on the strength of concrete, the ratio of prism compressive strength to cubic compressive strength, and the elastic modulus was analyzed. The results show that the strength and elastic modulus of concrete，which natural sand was replaced with the machine-made sand partially or completely，are improved under the same conditions of other materials and water consumption. The ratio of prism compressive strength to cube compressive strength the can still be calculated according to the relevant formulas of the current Code for the design of concrete structures（GB 50010—2010）. At the same time, through the regression analysis of the test data, elastic modulus calculation formula considering the influence of the replacement ratio of machine-made sand was proposed, The calculation results of the formula are in good agreement with the test results.
Keywords:machine-made sand; replacement ratio; strength of concrete; elastic modulus
作者簡介：劉家慧，學(xué)士，高級工程師，Email：79141192@qq.com。
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