Abstract
Potassium magnesium phosphate cement (MKPC) was prepared by using magnesium oxide (MgO) and potassium dihydrogen phosphate (KH2PO4, KDP). The effects of different calcination temperature, water-cement ratio and ratio on the operation of magnesium phosphate cement were studied. The effects of different water - cement ratio and ratio on the bonding strength of potassium magnesium phosphate cement and the application of potassium phosphate and magnesium cement in concrete repair and reinforcement were determined by experiments such as bending resistance, splitting, compression and bearing capacity. The experimental results show that the calcination temperature is 1100 °C, the calcination time is 1h, the settling time of magnesium oxide is 39min, and the compressive strength of one day reaches 53MPa. The water - cement ratio with the best bonding strength is 0.2, the mass ratio is 2:1.To meet the rapid repair of the construction requirements, is expected to be applied to the actual repair works.
Highlights
With the development of economy, people continue to improve the quality of life, and they have a higher requirement for travel quality
Magnesium phosphate cement prepared with lithium magnesium slag (MKPC) is a re-use of lithium waste and non-toxic, which is a new type of inorganic cementitious material with high bonding strength with old concrete
The raw materials used in this experiment are by-product magnesium oxide (MgO) in the process of extracting Li2CO3 from Qinghai CITIC Guoan Technology Co., Ltd. and potassium dihydrogen phosphate (KH2PO4) produced by Hedong District Hongyan Reagent Factory in Tianjin
Summary
With the development of economy, people continue to improve the quality of life, and they have a higher requirement for travel quality. Magnesium phosphate cement prepared with lithium magnesium slag (MKPC) is a re-use of lithium waste and non-toxic, which is a new type of inorganic cementitious material with high bonding strength with old concrete. This paper improves the maneuverability and volumetric stability of lithium magnesium slag magnesium phosphate cement by adjusting the calcination temperature and the way of adding fly ash to reduce the cost and obtain a new type of quick repair material which is economical, practical and environmentally friendly, and verify its feasibility in practical engineering
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