2013年10月22日星期二
batching plant
Concrete, abbreviated as "concrete", Cantonese called concrete, cementitious material is defined by the aggregate cemented into the overall project composites collectively. Usually talk refers to concrete as a cementitious material with cement, sand, stone for the aggregates, and water (with or without additives and admixtures) with a certain proportion, by mixing, forming, curing obtained cement concrete, also known as ordinary concrete. It is widely used in civil engineering.
Cement concrete is cement (or cement plus the amount of active admixture) as cementing materials, water and coarse and fine aggregates and other materials made by mixing an appropriate proportion with mixed materials, and then pouring molding obtained after hardening artificial stone . New mixing unhardened concrete, typically a concrete mixture (or fresh concrete). There is a certain strength of hardened concrete, said hardened concrete. Usually refers to the concrete in pavement engineering, asphalt concrete is also a common concrete
Depending on the requirements and conditions for the construction of concrete in the construction site or mixing station centralized agitation. Good fluidity concrete mixture can be self-loading mixer; less liquid or dry concrete mix is appropriate compulsory mixer. Before mixing the ingredients should mix requirements, control weighing error. Feeding sequence and mixing time have influence on the quality of concrete, should be strictly grasp, so that uniform mixing of the component materials
Cement concrete is cement (or cement plus the amount of active admixture) as cementing materials, water and coarse and fine aggregates and other materials made by mixing an appropriate proportion with mixed materials, and then pouring molding obtained after hardening artificial stone . New mixing unhardened concrete, typically a concrete mixture (or fresh concrete). There is a certain strength of hardened concrete, said hardened concrete. Usually refers to the concrete in pavement engineering, asphalt concrete is also a common concrete
Depending on the requirements and conditions for the construction of concrete in the construction site or mixing station centralized agitation. Good fluidity concrete mixture can be self-loading mixer; less liquid or dry concrete mix is appropriate compulsory mixer. Before mixing the ingredients should mix requirements, control weighing error. Feeding sequence and mixing time have influence on the quality of concrete, should be strictly grasp, so that uniform mixing of the component materials
2013年10月16日星期三
Problems Should Pay Attention to in Cement Concrete Pavement Construction
Cement concrete pavement has its resistance, bending, abrasion resistance, high stability, and many other advantages, are widely on the road at all levels. Cement concrete pavement construction, core is the mixing of concrete production and paving. Concrete mixing quality directly affects the intrinsic quality of the concrete, concrete pavement evenness affecting the quality is. Concrete slump is an important aspect of concrete production, what are the main factors affecting the concrete slump?
(1) the gradation change has great effects on the slump of concrete, water content and cover in the same case, slump is far less than the coarse material of concrete fine aggregate concrete slump, barn with concrete mix production process to aggregate material when you want to keep the cartridge on aggregate gradation is relatively stable, so as to ensure that the grading of concrete distribution.
(2) The changes in moisture content is even more obvious impact on the slump of concrete, mixing process should be measured in aggregate moisture content, scale should take out of the water.
(3) Cement temperature effect on slump of concrete cement is often ignored by builders, a factor that tends to occur in a single large production capacity of the concrete batching plant. More generous amount of mixing water mud, sometimes on one side to cement into a cement tank production and sometimes cement starting stirring as being cool, which not only enables the production of concrete high temperature, slump concrete temperatures are high, water absorption and larger and smaller.
(4) The weighing deviation of water scales and cement scales have a great influence on the slump of concrete, if the weighing deviation is stable, the operator can calculate based on the actual weight. If the deviation is less stable, especially water flow meter method of concrete batching plant, large and unstable water metering deviation, the slump is not easy to control.
(5) Amount of additives is also important factors affecting concrete slump, concrete additive amount of assembly made some large changes in physical and chemical properties.
(1) the gradation change has great effects on the slump of concrete, water content and cover in the same case, slump is far less than the coarse material of concrete fine aggregate concrete slump, barn with concrete mix production process to aggregate material when you want to keep the cartridge on aggregate gradation is relatively stable, so as to ensure that the grading of concrete distribution.
(2) The changes in moisture content is even more obvious impact on the slump of concrete, mixing process should be measured in aggregate moisture content, scale should take out of the water.
(3) Cement temperature effect on slump of concrete cement is often ignored by builders, a factor that tends to occur in a single large production capacity of the concrete batching plant. More generous amount of mixing water mud, sometimes on one side to cement into a cement tank production and sometimes cement starting stirring as being cool, which not only enables the production of concrete high temperature, slump concrete temperatures are high, water absorption and larger and smaller.
(4) The weighing deviation of water scales and cement scales have a great influence on the slump of concrete, if the weighing deviation is stable, the operator can calculate based on the actual weight. If the deviation is less stable, especially water flow meter method of concrete batching plant, large and unstable water metering deviation, the slump is not easy to control.
(5) Amount of additives is also important factors affecting concrete slump, concrete additive amount of assembly made some large changes in physical and chemical properties.
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