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前言混凝土型空砌块及路面砖般采用全自或半自砌块型机进行产型机型立即脱模所必须采用干硬性混凝土采用干硬性混凝土配合比才能使其制品达设计强度并满足产要求呢目前单位按照保罗米公式计算配合比存定误差塑性混凝土经验统计公式适合干硬性混凝土配合比计算;单位参考其单位配合比做定确、佳;单位凭经验试试难找合理配合比浪费少力物力强度够盲目增加水泥表面光增加砂率、采用石等些做都科我探讨干硬性配合比与混凝土强度素提混凝土路面配合比混凝土型空砌块承重砌块及填充砌块配合比选择
二、配合比设计计算步骤
砌块用混凝土配合比计算般三步骤
1、确定计算基本参数
首先根据用户要求确定制品强度等级再根据砌块空率确定混凝土配制强度般说砌块强度应混凝土强度三左右设计混凝土强度应提高110%~115%其根据制品结构型能力选择水灰比及水泥用量般路面砖水灰比要比砌块些再根据经济制品强度要求选择水泥用量根据干硬性混凝土拨系数及石空隙率所用材料实测砂石容重计算砂率
2、计算初步配合比
根据水灰比及水泥用量计算每立米用水量计算用水量要根据石吸水率、砂细度、水泥品种进行调节石吸水率于1.5%则用水量要增加根据粗集料用量及其吸水率计算增加水量;粉尘含量用水量应增
;采用细砂每立米混凝土增加10公斤水;根据绝体积等式砂率公式解联立程计算砂石用量每立米混凝土各种原材料用量
3、试拌与调整
先试拌12升混凝土做干硬性试验看否符合设计混凝土干硬度要求混凝土干硬度则需要保持水灰比变增加水泥水用量;若混凝土干硬度则需要增加砂石用量保持砂率变;若认砂量或足改变砂率增加砂或石用量调整求佳水灰比通根据计算水灰比与其邻近、且与计算水灰比相差±0.05三种水灰比做三组试验取强度符合要求、且水泥用量少组水灰比作产水灰比求试拌调整各种原料用量测定混凝土混全物容重计算每立米混凝土各种原材料用量
三、混凝土空砌块配合比设计
1、承重砌块配合比
承重砌块般强度等级7.5、10、15、20几种采用干硬性混凝土配合比计算15Mpa及砌块采用425#水泥20Mpa砌块采用525#水泥每立米混凝土水泥用量见表1
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