What are the factors influencing the setting time of paste in the process of paste filling
Release time:
2020-11-06
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In the process of paste filling, the main factors affecting the setting time of paste are the ratio of ash to sand, weight concentration, particle gradation and additives, etc. Below, these four factors will be discussed respectively.
- 1. Gray-sand ratio
In the case of a certain weight concentration, the setting time of the paste is shortened with the increase of the content of the cementing material, the main reason is that the higher the content of the cementing material, the more hydration products generated in the early stage, resulting in the shortening of the setting time. At different concentration levels, the setting time of the paste increased with the decrease of the lime-sand ratio. The greater the lime-sand ratio in the paste material ratio, the shorter the setting time of the paste.
- 2. Weight concentration
Under the same conditions, the greater the weight concentration of the paste, the smaller the water cement ratio. This means that the hydration reaction speed of the filling body is accelerated and the setting time is shortened. With the increase of the weight concentration of the paste, the setting time of the paste showed a decreasing trend. Compared with the effect of lime-sand ratio on the setting time of paste, the effect of paste weight concentration is relatively gentle. In the case of different lime-sand ratios, the concentration is determined68%Increase76%The shortening of the paste setting time is small. This is mainly because the measurement of the setting time is actually an indirect reflection of the strength performance of the paste, and the development of the strength of the paste mainly depends on the hydration reaction of the cement.
In addition, during the experiment, even if the concentration is low, it will not cause a large amount of cement loss. Therefore, the cement inside the slurry will quickly undergo hydration reaction. In the actual filling stope, if the filling concentration is low, a large amount of cement will be lost in the process of water filtration, resulting in the same cement content of the slurry setting time at low concentration, the ratio of lime to sand is much greater than that of high concentration.
- 3. Grain gradation
The tailings particle size has a significant effect on the paste setting time. Especially when the content of fine tailings is high, the setting time is longer. Due to the large specific surface area, large pores and large water absorption of ultrafine materials, the amount of water it consumes is naturally large. The large amount of water consumption leads to the increase of the weight concentration of the paste and the amount of cement. Under certain conditions, the content of ultrafine materials increases, resulting in the extension of the setting time and the decrease of the strength of the paste.
- 4. Additives
The additives that affect the coagulation performance of the paste include accelerators and retarders. Additives that can shorten the setting time and improve the early strength of the paste, and have no significant effect on the later strength are called accelerators. The addition of coagulant in cementitious filling materials is to meet certain industrial requirements that require early strength. There are many types of coagulants. Within a certain range, the setting time of the paste is shortened with the increase of the amount of coagulant added.
hunan yutai heavy industry, is a professional production of green mine paste filling equipment manufacturers. Since its establishment, it has built paste filling stations for many large mines in China. The company has a large number of professional filling technology line talent. If you need more information about filling, please contact us at 18774995599.
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2024-07-13
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