文档介绍：摘要
本文对泵送重混凝土进行了试验研究,采用理论分析和试验相结合的方法,对原材料、泵送重混凝土的配合比设计、性能等进行了试验分析,并对重混凝土的微观结构做了进一步的分析。
、磁铁矿、重晶石、钢丸以及普通砂的表观密度、堆积密度、压碎指标等性能指标所作的测试与分析表明,这些骨料可以用作重混凝土的粗、细骨料能满足重混凝土的密度要求。
使用了质量配合比法和体积配合比法相结合的泵送重混凝土配合比设计方法,对密度为3000kg/m3-3900kg/m3的泵送重混凝土进行了配合比设计。
,本设计所选用的是具有连续级配的5-20(mm)的粗骨料,细骨料选用由重砂和黄砂组成的混合砂,其密度越接近粗骨料的密度越好。泵送重混凝土掺入了一定量的粉煤灰、减水剂等掺合料大大改善重混凝土的流动性、保水性以及提高了拌合物的塌落度可以达200mm左右。
;泵送重混凝土的密度随用水量的增加有所降低;泵送重混凝土坍落度随用水量、水灰比和砂率的增加而增大,每立方米的用水量增加5-lOkg,坍落度增大5-20mm;砂率每增加2%,坍落度也增大5-20mm;泵送重混凝土抗压强度随水灰比的增大而减小。
,重混凝土具有良好的密实度,孔结构相对普通混凝土较少。
关键词:泵送;重骨料;重混凝土;原材料性能;配合比设计。
Abstract
In this PaPer, PumPing heavy concrete were studied bining theoretical analysis and test methods for raw materials, heavy PumPing of concrete mix design, Performance and other tests were analyzed, and re-do the microstructure of concrete and further Analysis.
testing and analyzing different ore materials on the resPects of unit volume density and index of crushed materials it shows that these ore material(namely Hematite, ite, barite, iron, steel shot, and a certain amount mon sand)can be used as coarse/fine aggregates for PumPing heavy concrete.
mix design ratio for such PumPing heavy concrete adoPted with both quality mix ProPortion and volume mix ProPortion has been used. By this method,On the density of 3000kg/m3-3900kg/m3 PumPing heavy concrete mix was designed.
the design ProPortion is made, coarse aggregates with constant grading (5-20mm) and fine aggregates with the density of close to coarse one should be minimum difference shall be the heavy concrete generally mixed with a certain amount of fly ash and other admixtures.
density of the PumPing heavy concrete has a lineal relation with the density of quantities shall decrease on the quantities and grit ProPortion have the Primary imPact on the slumP that shall increase with water quantities,water cement ratio