混凝土配合比計(jì)算書

混凝土配合比計(jì)算書,,,,,,,,,,,,,,,,

,,,,,,,配比編號(hào)：,,,,,,,,,

,,,,,,,,,,,,,,,,,

二、設(shè)計(jì)依據(jù)：1、JGJ55-2011《普通混凝土配合比設(shè)計(jì)規(guī)程》；2、GB/T50476-2008《混凝土結(jié)構(gòu)耐久性設(shè)計(jì)規(guī)范》,,,,,,,,,,,,,,,,

,3、設(shè)計(jì)圖紙,,,,,,,,,,,,,,,

三、混凝土設(shè)計(jì)強(qiáng)度等級(jí)：C35,,,,,,要求坍落度,,160-200mm,,,,,,,,

四、原材料：（見下表）,,,,,,,,,,,,,,,,

名稱,水泥,砂子,石子,外加劑1,,粉煤灰,礦粉,膨脹劑,,,,,,,,

規(guī)格,,中砂,5-25mm,高性能減水劑,,II級(jí)F類,,,,,,,,,,

廠別,,西江紫洞,興迅石場(chǎng),北京建愷,,高明,,,,,,,,,,

試驗(yàn)編號(hào),,,,,,,,,,,,,,,,

五、與配比相關(guān)的參數(shù)取數(shù)如下表：,,,,,,,,,,,,,,,,

名稱,,代號(hào),,取值,名稱,,代號(hào),,取值,,,,,,,

標(biāo)準(zhǔn)差,,σ,,5,水泥強(qiáng)度等級(jí)值,,"fce,g",,42.5,,,,,,,

砼強(qiáng)度標(biāo)準(zhǔn)值,,"fcu,k",,35,粉煤灰取代系數(shù),,λ,,1.0,,,,,,,

回歸系數(shù),,αa,,0.53,粉煤灰取代水泥率,,ω(%),,20,,輸入粉煤灰取代率,,,,,

回歸系數(shù),,αb,,0.2,膨脹劑摻量,,δ(%),,,,,,,,,

水泥強(qiáng)度富余系數(shù),,rc,,,砂率,,βs(%),,40,,輸入砂率,,,,,

摻合料取代水泥率,,μ（%）,,,混凝土容重,,mcp,,2350,,,,,,,

外加劑摻量,,ε（%）,,1.15,每方砼用水量,,m′wo,,154,,輸入水量,,,,,

相關(guān)參數(shù)取值說明：,,,,,,,,,,,,,,,,

"σ：混凝土強(qiáng)度在C25-C45時(shí)取5，≤C20,取4.0。",,,,,λ：此值在1.0~1.2之間。,,,,,,,,,,,

αa：用碎石取0.53，用卵石取0.49。,,,,,mcp：此值在2350~2450之間。,,,,,,,,,,,

"αb：用碎石取0.2,用卵石取0.13。",,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

六、配合比設(shè)計(jì)及計(jì)算：,,,,,,,,,,,,,,,,

,"1、試配強(qiáng)度：fcu,o=fcu,k+1.645σ",,,,,,,,,,,,,,,

,=,,43.2MPa,,,,,,,43.225,,,,,,

,2、計(jì)算水膠比(W/B)：,,,,,,,,,,,,,,,

,,,αa·fb,,,,,,,,,,,,,

,,W/B=,————————,,,,,,,,,,,,,

,,,"fcu,o+αa·αb·fb",,,,,,,,,,,,,

,,=,0.43,,,,,,,0.431431473,,,,,,

"當(dāng)fb無實(shí)測(cè)值時(shí)，fb=rffce=rf.rcfce,g=0.8×1.16×42.5=39.44MPa(rf為粉煤灰影響系數(shù)，fce為水泥28d",,,,,,,,,,,,,,,,

"膠砂抗壓強(qiáng)度，若無實(shí)測(cè)值，可按fce=rcfce,g；水泥強(qiáng)度等級(jí)fce,g為42.5時(shí)，富裕系數(shù)rc可取1.16.）",,,,,,,,,,,,,,,,

根據(jù)設(shè)計(jì)規(guī)范，結(jié)合經(jīng)驗(yàn)選定水膠比為0.37,,,,,,,,,,,,,,,,

,3、摻外加劑每立方米混凝土的用水量確定（mwo)：,,,,,,,,,,,,,,,

,外加劑減水率為31%，由此可知mwo=223（1-0.31）=154（kg/m3）,,,,,,,,,,223.1884058,153.87,,,,

,4、每立方米（基準(zhǔn)）混凝土的膠凝材料用量（mbo)可按下式計(jì)算：,,,,,,,,,,,,,,,

,,,mwo,,,,,,,,,,,,,

,,mbo=,————,,,,,,,,,,,,,

,,,W/B,,,,,,,水膠比,輸入水膠比,粉煤灰,,,,

,,=,416,kg/m3,,,,,,0.37,416.2162162,83.24324324,,,,

,5、每立方米混凝土的粉煤灰用量（mfo)：,,,,,,,,,,,,,,,

,,mfo=mbo·λω,,,,,,,,,333,83,416,,,

,,=,83,kg/m3,,,,,,,,,,,,

,6、計(jì)算外加劑用量（mao)：外加劑摻量1.0%,,,,,,,,,,,,,,,

,,mao=,mbo·ε,,,,,,,,,,,,,

,,=,4.784,kg/m3,,,,,,,,,,,,

,7、每立方米水泥用量（mco）:,,,,,,,,,,,,,,,

,mco=mbo-mfo,,,,,,,,,,,,,,,

,=333kg/m3,,,,,,,,,,333,輸?shù)阶髠?cè),,,,

,8、混凝土的砂率（βs)按經(jīng)驗(yàn)確定為：,,,,,,,,,,,,,,,

,,βs=,40,%,,,,,,,,,,,,

,9、計(jì)算混凝土的粗細(xì)骨料用量，這里采用重量法計(jì)算如下：,,,,,,,,,,,,,,,

,,mso(砂）=,[mcp-(mco+mfo+mao+mwo)]·βs,,,,,,,710.0864,1065.1296,,,,,

,,=,710,kg/m3,,,,,,,,,,,,

,,mgo(石）=,mcp-(mco+mfo+mao+mwo+mso）,,,,,,,,,,,,,

,,=,1065,kg/m3,,,,,,,,,,,,

10、由前計(jì)算得初步配比如下表：,,,,,,,,,,,,,,,,

,材料名稱,水泥,水,砂子,石子,外加劑1,粉煤灰,,,,333,154,710,1065,4.784,83

,"每方用量

(kg)",333,154,710,1065,4.78,83,,,,,,,,,

,,,,,,,,,,,,,,,,,

七、試驗(yàn)室配合比的確定,,,,,,,,,,,,,,,,

以初步計(jì)算的配合比試拌30L，測(cè)得混凝土坍落度為190mm，粘聚性和保水性良好，實(shí)測(cè)拌合物表觀密度,,,,,,,,,,,,,,,,

為2360kg/m3，含氣量為3.6，因此將此配比作為基準(zhǔn)配比。在單位用水量不變的情況下，按基準(zhǔn)配合比的水,,,,,,,,,,,,,,,,

膠比±0.05、砂率±1%，另拌制2組混凝土。,,,,,,,,,,,,,,,,

每立方米混凝土材料用量（kg/m3）,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,

序號(hào),水膠比,水泥,水,砂子,石子,外加劑1,粉煤灰,,,膠材,粉煤灰,水泥,減水劑,砂子,石子,

1,0.32,385,154,667,1042,5.53,96,,,481,96,385,5.5315,667,1042,2349.5315

2（基準(zhǔn)）,0.37,333,154,710,1065,4.78,83,,,,,,,,,2349.784

3,0.42,294,154,748,1077,4.22,73,,,367,73,294,4.2205,748,1077,2350.2205

7d、28d、標(biāo)養(yǎng)強(qiáng)度見下表,,,,,,,,,,,,,,,,

序號(hào),配合比（水泥:水：砂：石：外加劑：混合材）,,,,,坍落度,7d強(qiáng)度,28d強(qiáng)度,,,水泥,水,砂子,石子,外加劑1,粉煤灰

1,1:0.40:1.73:2.71:0.014：0.25,,,,,170,47.1,53.7,,,1,0.40,1.73,2.71,0.01437,0.25

2（基準(zhǔn)）,1:0.46:2.13:3.20:0.014：0.25,,,,,190,41.8,48.3,,,1,0.46,2.13,3.20,0.01437,0.25

3,1:0.52:2.54:3.66:0.014：0.25,,,,,205,36.1,43.0,,,1,0.52,2.54,3.66,0.01436,0.25

,,,,,,,,,,,,,,,,,

繪制強(qiáng)度-膠水比曲線,,,,,,,,,,,,,,,,

強(qiáng)度,膠水比,,,,,,,,,,,配比編號(hào),7d,28d,,

53.7,3.1,,,,,,,,,,,,41.8,48.3,,

48.3,2.7,,,,,,,,,,,,36.1,43,,

43.0,2