Study on the microscale structure and barrier mechanism of magnesium phosphate cement modified with fly ash cutoff walls for lead pollution in groundwater

2021 ◽  
Vol 308 ◽  
pp. 124994
Author(s):  
Xing Ji ◽  
Changwen Ye ◽  
Jinqiu Zhou ◽  
Kui He ◽  
Rui Zhu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Magnesium Phosphate ◽  
Lead Pollution ◽  
Cutoff Walls

Study on Preparation and the Setting Time of Magnesium Phosphate Cement

2014 ◽  
Vol 1049-1050 ◽  
pp. 251-255
Author(s):  
Run Qing Liu ◽  
Ding Qiang Chen ◽  
Tian Bo Hou
Keyword(s):  
Fly Ash ◽  
Orthogonal Experiment ◽  
Setting Time ◽  
Magnesium Phosphate ◽  
Mixture Ratio ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Orthogonal Analysis ◽  
Optimal Mixture Ratio

This paper mainly researched on preparation and the setting time of Magnesium Phosphate Cement (MPC). The method of orthogonal experiment was adapted to determine the best ratio of MPC, and change the content and types of the material according to the influence of various factors, so as to get the longer setting time of MPC. The results showed that, when the water cement ratio is 0.12, the factors significantly influencing the setting time is magnesium phosphorus ratio (M/P), fly ash and borax. The optimal mixture ratio was obtained through the orthogonal analysis, namely M/P is 3/1, borax content is 16%, and the amount of fly ash is 40%. When M/P is 1/1 and 2/2, borax content is not more than 22%, and the amount of fly ash was less than 60%, the longer setting time of MPC can be produced.

Properties of Phosphate Cement Mortar Used as Rapid-Repair Material

2011 ◽  
Vol 250-253 ◽  
pp. 1752-1756 ◽  
Author(s):  
Hong Wei Deng ◽  
Ying Zi Yang ◽  
Xiao Jian Gao
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
No Reduction ◽  
Cement Mortar ◽  
Magnesium Phosphate ◽  
Strength Development ◽  
Repair Material ◽  
Rapid Repair ◽  
Repair Materials ◽  
Early Strength

In order to determine the optimal proportion of magnesium phosphate cement mortar, the influences of ratio of magnesium phosphate cement-based binder (MPB) to sand (MPB/S), effects of fly ash on fluidity and strength development of MPB mortar, and the compatibility between MPB and traditional concrete and shrinkage of MPB mortar were investigated in this paper. The optimal proportion in this test was: setting adjusting agent of 12%, P/M ratio of 1:2(in weight), MPB/S ratio of 1:1 and FA/S ratio of 15%. The results showed that the MPB mortar met the higher early strength requirement of rapid-repair materials, with compressive strength beyond 50MPa and flexural strength more than 9.1MPa at 3 hours, and at later ages no reduction of strength happened. There was a good compatibility between MPB and traditional concrete. The shrinkage of MPB mortar at 28 days was less than 2.89 × 10-4. Therefore MPB is very suitable for rapid repairing of concrete structures.

Study on Modification of the Magnesium Phosphate Cement-Based Material by Fly Ash

2010 ◽  
Vol 150-151 ◽  
pp. 1655-1661 ◽  
Author(s):  
Dong Xu Li ◽  
Chun Hua Feng
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Fly Ash ◽  
Chemical Reactions ◽  
Setting Time ◽  
Physical And Mechanical Properties ◽  
Magnesium Phosphate ◽  
Excellent Mechanical Property

Fly ash can improve the physical and mechanical properties of the magnesium phosphate cement (MPC) paste. The influence of fly ash on the strength, the mortar fluidity, the durability and the setting time of MPC paste were studied in this paper. The results show that: The function of fly ash to the MPC is as followed: physical fill, superplastic and chemical reactions; the optimal content of fly ash is about 30% by weight, and MPC with 30% fly ash has excellent mechanical property and high fluidity; the fineness of magnesia affected the mechanical properties of MPC.

Insight into barrier mechanism of fly ash-bentonite blocking wall for lead pollution in groundwater

2020 ◽  
Vol 590 ◽  
pp. 125444
Author(s):  
Bing Liao ◽  
Yanying Li ◽  
Yu Guan ◽  
Yanhui Liu ◽  
Qinqin Huang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Lead Pollution ◽  
Insight Into

Study on the Drying Shrinkage Property of Magnesium Phosphate Cement

2016 ◽  
Vol 852 ◽  
pp. 1468-1472 ◽  
Author(s):  
Zhao Qing Qi ◽  
Hong Tao Wang ◽  
Jian Hua Ding ◽  
Shi Hao Zhang
Keyword(s):  
Fly Ash ◽  
Drying Shrinkage ◽  
Shrinkage Rate ◽  
Magnesium Phosphate ◽  
Bench Mark ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Two Factors ◽  
Shrinkage Property

The influence of magnesium to phosphate weight ratios (M/P ratio), borax content, water to cement ratio (w/c ratio), fly ash, slag on magnesium phosphate cement of drying shrinkage is examined.The results show that the drying shrinkage of magnesium phosphate cementcan be affected at some extent by M/P ratio, w/c ratio,boraxcontent. Both the former two factors and the effects are significant.It was found that the drying shrinkage of magnesium phosphate cement decrease with the increase of M/P ratio,borax content, w/c ratio. If the 10%, 15% offly ashinstead of magnesium phosphate cement was added, drying shrinkage rate decreases with increases of dosage fly ash. When the 15% of magnesium phosphate cement is replaced by fly ash, the shrinkage rate of hydration 20d reachs11.2×10-5. When the 10% of magnesium phosphate cementis replaced by slag, the drying shrinkage rate reducedto 87.6%.comparing to the bench mark ,the drying shrinkage rate of 20d is only 2.78×10-5.

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