混凝土強(qiáng)度質(zhì)量評(píng)定

新疆建設(shè)職業(yè)技術(shù)學(xué)院教案PAGE第4頁(yè)共8頁(yè)混凝土強(qiáng)度質(zhì)量評(píng)定用統(tǒng)計(jì)方法評(píng)定混凝土強(qiáng)度時(shí)，其強(qiáng)度應(yīng)同時(shí)符合下列兩式的規(guī)定：mfcu－λ1Sfcu≥0.9fcu.kfcu.min≥λ2fcu.k用非統(tǒng)計(jì)方法評(píng)定混凝土強(qiáng)度時(shí)，其強(qiáng)度應(yīng)同時(shí)符合下列兩式的規(guī)定：mfcu≥1.15fcu.kfcu.min≥0.95fcu.kmfcu——同一驗(yàn)收批混凝土立方體抗壓強(qiáng)度的平均值（N／mm2）；Sfcu——同一驗(yàn)收批混凝土強(qiáng)度的標(biāo)準(zhǔn)差（N／mm2）；當(dāng)Sfcu的計(jì)算值小于0.06fcu.k時(shí)，取Sfcu＝0.06fcu.k；Sfcu=fcu.k——設(shè)計(jì)的混凝土立方體抗壓強(qiáng)度標(biāo)準(zhǔn)值（N／mm2）；fcu.min——同一驗(yàn)收批混凝土立方體抗壓強(qiáng)度的最小值（N／mm2）；λ1、λ2——合格判定系數(shù)，按附表取用。合格判定系數(shù)合格判定系數(shù)試塊組數(shù)10～1415～24≥25λ11.701.651.60λ20.900.85注：當(dāng)單位工程中僅有一組試塊時(shí)，其強(qiáng)度不應(yīng)低于1.15fcu.k。例題：（1）某工程混凝土（C50）驗(yàn)收批，混凝土強(qiáng)度數(shù)據(jù)如下，試按統(tǒng)計(jì)法進(jìn)行混凝土強(qiáng)度質(zhì)量評(píng)定。2766.762872.9630253102.4952.653.65555.726012580.6426013102.495150.85155.72937.642693.612937.642937.6454.251.954.254.2270428092641.962840.89525351.453.32641.962570.493203.5651.450.756.6解：根據(jù)GBJ107—87之規(guī)定進(jìn)行混凝土強(qiáng)度質(zhì)量評(píng)定。mfcu=1008.3÷19=53.068（N／mm2）Sfcu===1.87＜0.06fcu.k=3N／mm2∴Sfcu=3N／mm2查表得：λ1=1.65λ2=0.85mfcu－λ1Sfcu=53.068—1.65×3=48.118N／mm2＞0.9fcu.k=45N／mm2例題：（2）某工程混凝土（C30）驗(yàn)收批，混凝土強(qiáng)度數(shù)據(jù)如下，試按統(tǒng)計(jì)法進(jìn)行混凝土強(qiáng)度質(zhì)量評(píng)定。1239.041142.441011.241108.891162.8135.233.831.833.334.11142.441102.241122.251162.81102433.833.233.534011075.8410241102.243535.132.83233.212251303.21967.211049.76912.043536.131.132.430.21128.961204.091211.041142.441232.0133.634.734.833.835.11274.491288.811267.361391.291274.4935.735.935.637.335.71108.8913691391.291239.041204.0933.33737.335.234.71082.411436.411406.2510891288.8132.937.937.53335.9解：根據(jù)GBJ107—87之規(guī)定進(jìn)行混凝土強(qiáng)度質(zhì)量評(píng)定。mfcu=1374.6÷40=34.365（N／mm2）Sfcu===1.8＜0.06fcu.k=1.8N／mm2∴Sfcu=1.8N／mm2查表得：λ1=1.60λ2=0.85mfcu－λ1Sfcu=34.365—1.60×1.8=31.485N／mm2＞0.9fcu.k=27N／mm2fcu.min=30.2N／mm2＞λ2fcu.k=0.85×30=25.5N／mm2結(jié)論：根據(jù)GBJ107—87之規(guī)定，該驗(yàn)收批混凝土強(qiáng)度經(jīng)采用統(tǒng)計(jì)方法評(píng)定為合格。建筑工程事故產(chǎn)生的嚴(yán)重后果是如何分類的？簡(jiǎn)述事故處理的一般程序？混凝土表層缺陷產(chǎn)生的原因有哪些？4.某工程混凝土（C30）驗(yàn)收批，混凝土強(qiáng)度數(shù)據(jù)如下，試按統(tǒng)計(jì)法進(jìn)行混凝土強(qiáng)度質(zhì)量評(píng)定。35.233.831.833.334.133.833.233.534.1323535.132.83233.23536.131.132.430.233.634.734.833.835.135.735.935.637.335.733.33737.335.234.732.937.937.53335.9課堂練習(xí)題：（1）某工程混凝土（C50）驗(yàn)收批，混凝土強(qiáng)度數(shù)據(jù)如下，試按統(tǒng)計(jì)法進(jìn)行混凝土強(qiáng)度質(zhì)量評(píng)定。52.653.65555.75150.8