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公路桥梁高强轻质混凝土硅微粉配合比研究
- 2019-03-30-

FG美人捕鱼1.QUEDINGSHIPEIQIANGDU。GENJUWOGUO《QINGJILIAOHUNNINGTUJISHUGUICHENG》(JGJ51-90)DEGUIDING,HSLCDESHIPEIQIANGDUKEYOUGONGSHIQUEDING。

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4.XUANZEGAOQIANGTAOLIHSLCYIBANYAOXUANZEMIDUDENGJI>700、TONGYAQIANGDU>5.0MPa、QIANGDUBIAOHAO>30MPaDEYUANQIUXINGGAOQIANGTAOLI,QIEQIGEXIANGZHIBIAOYINGMANZU《QINGGULIAO》GB/T17431.1YOUGUANYAOQIUDERENZAOGAOQIANGQINGJILIAO。

5.XUANZEYONGSHUILIANGHESHUIHUIBIHSLCDEYONGSHUILIANGHESHUIHUIBI,FENJINGYONGSHUILIANGHEJINGSHUIHUIBIJIZONGYONGSHUILIANGHEZONGSHUIHUIBI,SUOWEIJINGYONGSHUILIANGXIZHIBUBAOKUOGAOQIANGTAOLI1hXISHUILVZAINEIDEHUNNINGTUYONGSHUILIANG,QIXIANGYINGDESHUIHUIBIZEWEIJINGSHUIHUIBI,ZAIHSLCPEIHEBISHEJIZHONG,YIBANYONGJINGYONGSHUILIANGHEJINGSHUIHUIBIBIAOSHI。HSLCDEYONGSHUILIANG(HUOSHUIHUIBI)BUJINDUIYINGHUAHUNNINGTUDEXINGNENGYOUHENDAYINGXIANG,ERQIEHAIZHIJIEYINGXIANGBANHEWUDEHEYIXING。

6.SHALVDEXUANZEHSLCDESHALVSHIYITIJIBILAIBIAOSHIDE,JIYISHADETIJIYUCUXIJILIAOZONGTIJIDEBAIFENBILAIBIAOSHIDE。SHALVDETIGAO,SHIHSLCWENXIANRENWEIZAIYIDINGDESHALVFANWEINEI:18%~60%QIANGDUTIGAODEYIGEZHUYAOYINSU(DANYOUGUAN。SHALVDUIHSLCDEQIANGDUYINGXIANGBUDA),QIEQIDANXINGMOLIANGYEYOUSUOTIGAO。DANSUIZHESHALVDETIGAO,HSLCDEBIAOGUANMIDUYEZHUJIANZENGJIA.DANGHSLCDEQIANGDUDENGJIWEILC40-LC60,SHALVWEI40%ZUOYOUSHI,HUNNINGTUBANHEWUDEHEYIXINGZUIHAO。

7.CUXIJILIAOYONGLIANGTASHIZHIPEIZHI1m3HSLCSUOXUDEGAOQIANGTAOLIHEPUTONGSHADEMISHITIJI,KECANKAO《QINGJILIAOHUNNINGTUJISHUGUICHENG》(JGJ51-90),YONGJUEDUITIJIFAQIUCHU。

8.掺和料等外加剂由于HSLC的水泥用量与同强度等级的普通混凝土偏多,实践证明,为减少水泥用量,改善和易性和其他一系列的物理力学性能,在HSLC中加入适量的掺和剂,如微硅粉、优质粉煤灰、磨细高炉矿碴、F矿粉等,可获得很好的技术经济效益。一般在配制LC50及以下的HSLC时,掺加粉煤灰即可,当配制LC50以上的HSLC则需掺加硅粉等。在使用掺合料的同时,必须使用高效减水剂,以减小用水量,降低水灰比。粉煤灰的掺加采用“超量取代法”,且在预应力HSLC中其取代水泥率不宜大于10%~15%,而对于微硅粉的最大掺加量,根据ACI213委员会报告《硅粉用于混凝土》的观点,“1kg硅微粉可取代3~4kg水泥而不导致强度的降低。”从目前的研究来看,改良HSLC的配合比,采用“双掺”或“多掺”及复合掺加技术,即在加入高效减水剂的同时,根据混凝土性能的要求加入一种或几种(复合化)超细活性矿物材料,并加大掺入的比例,可以大幅度提高拌合料的工作性能,并对其物理力学特性有较显著的改善作用。四、结论从本文可知,HSLC的施工条件要求较高,质量不容易控制。施工时必须对HSLC采用“双掺”或“多掺”等方法进行改性,以提高拌合料的工作性能,保证HSLC的施工质量。另外,我国应加大高强陶粒的研究工作,尽快生产出高性能高强陶粒,从根本上改变HSLC的力学性能,为HSLC在公路桥梁上的广泛使用铺平道路。