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求助C50混凝土配合比设计 [复制链接]

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求助:C50混凝土配合比设计(使用P.O52.5水泥和外加剂)ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
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C50高等级混凝土配合比设计总说明书ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
一、    试验所用仪器设备及试验环境ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
试验过程中使用的仪器设备精度、规格、准确性等均符合规范要求,且均通过某省计量测试所检定合格,试验室、标养室,温度、湿度符合规范要求。ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
二、    材料的选用ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
1、水泥:选***52.5R硅酸盐水泥,依据GB/T17671-1999、GB/T1346-2001及GB/T1345-1991试验,各项指标均符合GB175-1999规范要求,详见下表ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
                                                                 表1ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
厂牌名称等级    水 泥ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
批 号    细度ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
(%)    标准细度用水  量(%)    初凝时间    终凝时间    安 ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
性    3天抗 折强度(Mpa)    3天抗 压强度(Mpa)    28天抗折强度(Mpa)    28天抗压强度(Mpa)ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
万年青P.oÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
52.5R    X5010      1.2    27.2    2h:36min    3h:51min    合ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
格    5.3    27.2    8.0    56.1ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
        ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
2、 细骨料:选用**砂石厂河砂,依据JTJ058-2000试验,其各项指标均符合<<公路工程国内招标文件范本>>(2003年版)及JTJ041-2000规范要求,详见下表ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
                                                              表2ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
名称    产地    表观密度ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
(Kg/m3)    含泥量ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
(%)    筛分析    细度模数ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
河砂    金凤砂石厂    2668    1.0    Ⅱ区    2.8ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
       ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
3、 粗骨料:选用****石料厂碎石,依据JTJ58-2000试验,其各项指标均符合<<公路工程国内招标文件范本>>(2003年版)及JTJ041-2000规范要求,详见下表ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
                                                              表3ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
名称    产地    表观密度(Kg/m3)    针片状含量(%)    含泥量ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
(%)    压碎值ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
(%)    颗粒级配ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
碎石    进贤池溪石料厂    2690    3.6    0.2    10.0    5-20mmÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
     ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
    4、 水:饮用水,符合JTJ041-2000规范砼用外加剂要求,其各项性能指标详见厂家产品说明书及外委试验报告。ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
5、外加剂:选用******实业有限公司HD-FDN高效减水剂,符合JTJ041-2000规范砼用外加剂要求,其各项性能指标详见厂家厂品说明书及外委试验报告。ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
三、    配合比的设计与计算ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
依据JGT55-2000及公路工程国内招标文件范本2003版下册,结合工地实际情况对C50普通砼进行设计与计算,具体过程如下:ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
1、    计算试配强度:ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
fcu.o=fcu.r+1.645δ=59.9MpaÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
2、    计算水灰比:ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
W/C=aa×fce/fcu.o+aa×ab×fce=(0.46×52.5)/(59.9+0.46×0.07×52.5)=0.39。ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
3、    选用每立方米砼用水量:ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
mwo=198Kg/m3ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
当掺入外加剂时:ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
mwo=198×(1-16%)=166Kg/m3ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
4、    计算每立方米砼水泥用量:ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
mco=mwo/(W/C)=166/0.39=426Kg/m3ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
5、选取砂率:ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
βS=0.39ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
6、计算每立方米砼粗、细骨料用量(mcp取值为2450Kg/m3):ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
mco+mgo+mso+mwo=mcpÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
βS=mso/(mgo+mso)×100%  ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
mso=725 Kg/m3              mgo=1133 Kg/m3ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
mcogosowo=426:1133:725:166 =1:2.66:1.70:0.39ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
试 验编 号    设计强度    水ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
比    砂率(%)    试配强度(Mpa)    各项材料用量(Kg/m3)    设计坍ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
落  度ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
(mm)    实测坍落度(mm)    7d抗压强度(Mpa)    28d抗压强度(Mpa)ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
                    水泥    砂子    碎ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
石    水    外ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
剂                ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
H-040    C50    0.39    39    59.9    426    725    1133    166    3408    70-90    90    50.8    56.9ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
H-041    C50    0.36    38    59.9    461    693    1130    166    3688    70-90    85    55.8    61.9ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
H-042    C50    0.33    37    59.9    503    659    1122    166    4024    70-90    80    59.1    64.9ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
四、 通过上述(三)的计算,以上计算配合比为基准配合比,另外分别增减水灰比及砂率,进行试拌,对其拌和物和易性分别进行检测,均能满足设计要求,并分别将拌和物制件,标准养护,进行7d和28d的抗压强度检验,详见下表ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
                                                                       表4   五、根据经济合理,保证工程质量,方便施工、砼和易性的原则,拟订表4中试样编号为H-041的配合比为C50砼的配合比,具体用于预制板梁、伸缩缝、封锚。ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
六、所用减水剂约27.5吨。ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
七、  附件ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
1、    砼设计配合比试验记录ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
2、    水泥物理力学性能试验记录ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
3、    砂子试验记录ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
4、    碎石试验记录ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
5、    外加剂外委试验报告ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;

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    谢谢了!ÃCí8rªóÂ͹bbs.3c3t.comfº…²†˜7;
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