由于人們?nèi)狈?duì)天然石粉的認(rèn)識(shí)，認(rèn)為它是對(duì)混凝土有害，因此不能加以利用。這樣既造成了資源浪費(fèi)，又造成了環(huán)境污染。廢棄天然石粉的堆積占據(jù)了大量土地，如何處理是一個(gè)亟待解決的問題。因此，經(jīng)濟(jì)合理地利用這些天然石粉，既能夠消除天然石粉對(duì)環(huán)境的污染，又能夠?yàn)闄C(jī)制砂的生產(chǎn)和使用消除后顧之憂。

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.濟(jì)南天然石粉在混凝土中的作用機(jī)理

1. Action mechanism of Jinan natural stone powder in concrete

關(guān)于天然石粉在混凝土中的作用機(jī)理主要有兩種觀點(diǎn):一種觀點(diǎn)認(rèn)為天然石粉沒有活性，在混凝土中起填充效應(yīng)。天然石粉對(duì)膠凝材料起到一定填充效應(yīng)，能夠改善混凝土的孔隙特征、漿和集料的界面結(jié)構(gòu)。另一種觀點(diǎn)認(rèn)為天然石粉具有一定的火山灰活性，能夠發(fā)揮火山灰效應(yīng)。

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.

除了以上兩種作用，天然石粉還能參與水泥水化反應(yīng)，對(duì)混凝土的工作性和耐久性都有一定影響。根據(jù)天然石粉的作用機(jī)理，天然石粉在混凝土中的可取代部分細(xì)骨料或者作為碾壓混凝土摻合料。

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.天然石粉部分取代細(xì)骨料

2. Natural stone powder partially replaces fine aggregate

天然石粉在一定摻量范圍內(nèi)可起到填充密實(shí)和微集料效應(yīng)，能明顯改善新拌混凝土的和易性，而對(duì)混凝土的凝結(jié)時(shí)間幾乎沒有影響，可提高混凝土的強(qiáng)度和抗?jié)B性能，還可減少水泥用量，可以降低絕熱溫升，這對(duì)于減小溫度應(yīng)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.

天然石粉是一種容易得到且價(jià)廉的材料，骨料的加工過程中也會(huì)帶來大量的天然石粉，如果不加以利用，不僅要占用場(chǎng)地堆放，而且會(huì)對(duì)環(huán)境造成污染。如果能將其稍作加工后作為摻合料使用，替代日益緊缺的粉煤灰和價(jià)格相對(duì)昂貴的硅粉或礦渣，對(duì)于解決實(shí)際工程的原材料緊缺問題、降低工程造價(jià)以及對(duì)環(huán)保等將具有重大的現(xiàn)實(shí)意義。

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.

天然石粉的形成過程使其具有較大的比表面積，一般在600m2/kg以上，使得其作為摻合料在混凝土中應(yīng)用成為可能。近幾年來，天然石粉在混凝土中應(yīng)用已逐漸成為一種趨勢(shì)。當(dāng)然您有疑惑或者相關(guān)需求，可以隨時(shí)來我們網(wǎng)站http://www.netjobs.cc咨詢了解！

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 http://www.netjobs.cc Consult and understand!