再生微粉基本性能及活性试验研究

Experimental Study on Basic Properties and Activity of Recycled Fine Powder

为探究再生微粉基本性能及活性,首先通过XRD和XRF分析各类再生微粉的化学与矿物组成,得出各类再生微粉SiO2的含量均较高.接着分别试验各类再生微粉的需水量比、流动度和烧失量,并结合BET和SEM进行分析,发现再生微粉的需水量比和流动度与其独特的微观形貌密切相关.之后测定了细度相近的不同种类再生微粉强度活性指数,参照粉煤灰强度活性指数试验方法进行,初步探究了不同种类再生微粉以及混合再生微粉的强度指数变化规律,得出再生砖粉的活性最好,强度活性指数可以达到76%.且当混合再生微粉中再生砖粉的含量达到75%以上时,混合再生微粉的强度活性指数可以达到70%以上.

To investigate the basic properties and activity of recycled fine powder.Firstly,the chemical and mineral compositions of various recycled fine powder were analyzed by XRD and XRF,it is concluded that the content of SiO 2 in all kinds of recycled fine powder was higher.Then,the water requirement ratio,fluidity and loss on ignition of various recycled fine powder were tested,respectively,and analyzed by combining BET and SEM.It is found that the water requirement ratio and fluidity of recycled fine powder are closely related to its unique micro-morphology.After that,the strength activity index of different recycled fine powder with similar fineness was measured,referring to the test method of strength activity index of fly ash.The variation rules of strength activity index of different types of recycled fine powders and recycled hybrid fine powder were preliminarily investigated.It is concluded that recycled fine brick powder had the best activity,with the strength index reaching 76%,and when the content of recycled fine brick powder in recycled hybrid fine powder reaches more than 75%,the strength index of recycled hybrid fine powder can reach more than 70%.