由于人们缺乏对天然石粉的认识，认为它是对混凝土有害，因此不能加以利用。这样既造成了资源浪费，又造成了环境污染。废弃天然石粉的堆积占据了大量土地，如何处理是一个亟待解决的问题。因此，经济合理地利用这些天然石粉，既能够消除天然石粉对环境的污染，又能够为机制砂的生产和使用消除后顾之忧。

Due to a lack of understanding of natural stone powder, it is considered harmful to concrete and therefore cannot be utilized. This not only causes a waste of resources, but also causes environmental pollution. The accumulation of waste natural stone powder occupies a large amount of land, and how to deal with it is an urgent problem to be solved. Therefore, using these natural stone powders economically and reasonably can not only eliminate the environmental pollution caused by natural stone powders, but also eliminate worries for the production and use of machine-made sand.

1.济南天然石粉在混凝土中的作用机理

1. Action mechanism of Jinan natural stone powder in concrete

关于天然石粉在混凝土中的作用机理主要有两种观点:一种观点认为天然石粉没有活性，在混凝土中起填充效应。天然石粉对胶凝材料起到一定填充效应，能够改善混凝土的孔隙特征、浆和集料的界面结构。另一种观点认为天然石粉具有一定的火山灰活性，能够发挥火山灰效应。

There are two main viewpoints on the action mechanism of natural stone powder in concrete: one is that natural stone powder has no activity and has a filling effect in concrete. Natural stone powder has a certain filling effect on cementitious materials, and can improve the pore characteristics of concrete, as well as the interfacial structure of slurry and aggregate. Another view is that natural stone powder has certain pozzolanic activity and can exert the pozzolanic effect.

除了以上两种作用，天然石粉还能参与水泥水化反应，对混凝土的工作性和耐久性都有一定影响。根据天然石粉的作用机理，天然石粉在混凝土中的可取代部分细骨料或者作为碾压混凝土掺合料。

In addition to the above two functions, natural stone powder can also participate in the cement hydration reaction, which has a certain impact on the workability and durability of concrete. According to the action mechanism of natural stone powder, natural stone powder can replace some fine aggregates in concrete or be used as an admixture for roller compacted concrete.

2.天然石粉部分取代细骨料

2. Natural stone powder partially replaces fine aggregate

天然石粉在一定掺量范围内可起到填充密实和微集料效应，能明显改善新拌混凝土的和易性，而对混凝土的凝结时间几乎没有影响，可提高混凝土的强度和抗渗性能，还可减少水泥用量，可以降低绝热温升，这对于减小温度应力、提高混凝土抗裂性能是非常有利的。

Natural stone powder can play a filling and dense and microaggregate effect within a certain amount range, significantly improving the workability of fresh concrete, with little impact on the setting time of concrete. It can improve the strength and impermeability of concrete, reduce the amount of cement, and reduce the adiabatic temperature rise. This is very beneficial for reducing temperature stress and improving the crack resistance of concrete.

天然石粉是一种容易得到且价廉的材料，骨料的加工过程中也会带来大量的天然石粉，如果不加以利用，不仅要占用场地堆放，而且会对环境造成污染。如果能将其稍作加工后作为掺合料使用，替代日益紧缺的粉煤灰和价格相对昂贵的硅粉或矿渣，对于解决实际工程的原材料紧缺问题、降低工程造价以及对环保等将具有重大的现实意义。

Natural stone powder is an easily available and inexpensive material. The processing of aggregates can also bring a large amount of natural stone powder. If not utilized, it will not only occupy the site for stacking, but also cause environmental pollution. If it can be slightly processed and used as an admixture to replace the increasingly scarce fly ash and relatively expensive silica fume or slag, it will have significant practical significance in solving the problem of raw material shortage in practical projects, reducing project costs, and protecting the environment.

天然石粉的形成过程使其具有较大的比表面积，一般在600m2/kg以上，使得其作为掺合料在混凝土中应用成为可能。近几年来，天然石粉在混凝土中应用已逐渐成为一种趋势。当然您有疑惑或者相关需求，可以随时来我们网站https://www.jnfhjc.com咨询了解！

The formation process of natural stone powder makes it have a large specific surface area, generally over 600m2/kg, making it possible to use it as an admixture in concrete. In recent years, the application of natural stone powder in concrete has gradually become a trend. Of course, if you have any doubts or related needs, you can come to our website at any time https://www.jnfhjc.com Consult and understand!