【正文】 混凝土強(qiáng)度與水泥細(xì)度相關(guān)規(guī)律的影響。 本科學(xué)生畢業(yè)設(shè)計(jì)（論文） 水泥細(xì)度對(duì)混凝土早期性能的影響 Graduation Design(Thesis) of Chongqing University Reasearch of the effect of cement fineness on the early properties of concrete Undergraduate: Gaoyang Supervisor: Dr. Jia Xingwen Major: Inanic nonmetallic materials engineering College of Material Science and Engineering Chongqing University June 2020 重慶大學(xué)本科學(xué)生畢業(yè)設(shè)計(jì)（論文） 中文摘要 Ⅰ 摘 要 應(yīng)用于大跨度預(yù)應(yīng)力橋梁的水泥，由于施工要求早期強(qiáng)度，加之國(guó)家標(biāo)準(zhǔn)沒(méi)有規(guī)定細(xì)度上限，因此越磨越細(xì)。 測(cè)定了不同 細(xì)度水泥的標(biāo)準(zhǔn)稠度用水量，凝結(jié)時(shí)間，膠砂擴(kuò)展度 。t fixed a fineness limit, the fineness of cement used in longspan prestressed concrete bridge increases without control. Excessive fineness begins to affect the performance of all aspects of concrete. For that reason, in this paper the affect of cement fineness on the early properties of concrete is studied. The results show that early pressive strength of concrete increases with the fineness， and growth curve turns from steep to flat； Early tensile strength of concrete increases with the fineness, and the growth is modest. Tensile strength decreases when surface area reaches 400 ； Standard consistency water grows slowly with the time gradually shortened with increasing addition of superplasticizer and mineral admixtures improves the strength of concrete which uses fine cement better. According to the experimental results,the author remends to use fine cement whose surface area ranges between 350 and 400 in structures which has the demand of early strength. Key words： cement fineness , early strength , standard water consistency, setting time, mortar fluidity 重慶大學(xué)本科學(xué)生畢業(yè)設(shè)計(jì)（論文） 目錄 Ⅱ 目 錄 中文摘要 .......................................................................................................................Ⅰ ABSTRACT .................................................................................................................Ⅱ 1 緒 論 .......................................................................................................................... 1 ................................................................................................................... 1 預(yù)應(yīng)力連續(xù)剛構(gòu)橋梁對(duì)水泥的要求 ....................................................................... 2 研究水泥細(xì)度與橋梁混凝土力學(xué)性能關(guān)系的必要性 .............................................. 2 ........................................................................................................ 2 水泥細(xì)度對(duì)工作性能的影響 ................................................................................. 2 水泥細(xì)度對(duì)混凝土力學(xué)性能的影響 ....................................................................... 5 水泥細(xì)度對(duì)混凝土耐久性的影響 .......................................................................... 7 顆粒分布對(duì)水泥性能的影響 ................................................................................. 8 ....................................................................................................10 2 原材料和試驗(yàn)方法 ................................................................................................11 .....................................................................................................................11 驗(yàn)方法 ..................................................................................................................13 3 水泥細(xì)度對(duì)標(biāo)稠、凝結(jié)時(shí)間、膠砂擴(kuò)展 度的影響 ...................................15 ...........................................................................15 ......................................................................................15 ..................................................................................16 新拌混凝土坍落度 的影響 ..........................................16 .........................................................................................................................17 4 水泥細(xì)度對(duì)混凝土力學(xué)性能的影響 ...............................................................18 泥細(xì)度對(duì)膠砂強(qiáng)度的影響 ......................................................................................18 水泥細(xì)度對(duì)膠砂抗折強(qiáng)度的影響 .........................................................................18 重慶大學(xué)本科學(xué)生畢業(yè)設(shè)計(jì)（論文） 目錄 Ⅱ 水泥細(xì)度對(duì)膠砂抗壓強(qiáng)度的影響 .........................................................................19 ...........................................................................20 水泥細(xì)度對(duì)混凝土抗壓強(qiáng)度的影響 ......................................................................20 水泥細(xì)度對(duì)混凝土劈裂抗拉強(qiáng)度的影響 ...............................................................22 減水劑和礦渣摻量對(duì)水泥細(xì)度和混凝土早期力學(xué)性能相關(guān)規(guī)律的影響 .................24 .........................................................................................................................27 5 結(jié)論和展望 ..............................................................................................................27 參 考 文 獻(xiàn) ................................................................................................................28 重慶大學(xué)本科學(xué)生畢業(yè)設(shè)計(jì)（論文） 緒論 1 1 緒 論 研究背景 預(yù)應(yīng)力連續(xù)剛構(gòu)橋梁這一結(jié)構(gòu)形式由 于其用料省、自重輕、行車平穩(wěn)、跨越能力強(qiáng)等顯著的優(yōu)越性，在實(shí)際工程中得到了越來(lái)越廣泛的應(yīng)用。該標(biāo)準(zhǔn)強(qiáng)化了 3 d 早期強(qiáng)度意識(shí) ,倡導(dǎo)多生產(chǎn) R 型水泥。 由于國(guó)家標(biāo)準(zhǔn)對(duì)于水泥的細(xì)度上限沒(méi)有作規(guī)定，導(dǎo)致實(shí)際工程中采用的水泥 比表面積越來(lái)越偏大 ， 80μm 篩余量大多都小于 3%，甚至沒(méi)有篩余，水泥比表面積已高達(dá) 400 ㎡ /kg。 預(yù)應(yīng)力連續(xù)剛構(gòu)橋梁對(duì)水泥的要求 用于預(yù)應(yīng)力連續(xù)剛構(gòu)橋梁的高性能混凝土，其性能要求要高于一般的普通混凝土，除了拌合物需要有良好的工作性以外，較高的強(qiáng)度和優(yōu)越的耐久性也是必不可少的。 研究水泥細(xì)度與橋梁混凝土力學(xué)性能關(guān)系的必要性 在工程進(jìn)度和工程質(zhì)量這兩者的矛盾中，水泥的細(xì)度起著重要的控制作用：細(xì)度過(guò)小，則水化速度慢，早期強(qiáng)度達(dá)不到要求，施工進(jìn)度慢，嚴(yán)重影響模板 、 場(chǎng)地和施工機(jī)械的周轉(zhuǎn)效率，延長(zhǎng)工期，增加工程投資，帶來(lái)不必要的浪費(fèi)；細(xì)度過(guò)大，則初期水化速度過(guò)快，放熱量大，收縮增加，產(chǎn)生過(guò)大的溫度應(yīng) 力和收縮裂縫，影響結(jié)構(gòu)的耐久性，而且細(xì)度過(guò)大還可能導(dǎo)致混凝土后期強(qiáng)度增長(zhǎng)緩慢乃至倒縮。石小芳 [4]等人研究了