Alumina-based hydraulic binder systems
A binder and hydraulic technology, which is applied in the field of producing the hydraulic binder system, can solve the problems of volume shrinkage, accelerated solidification, low permeability, etc., and achieve good drying behavior, good corrosion resistance and resistance Permeability, low shrinkage effect
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Embodiment 1
[0137] Example 1: Curing behavior of fine-grained compositions consisting of calcined alumina
[0138] Table 1: Composition of Fine Particle Compositions
[0139] Composition of composition [wt%]
components
84.30
Binder system according to table 2
15.70
add water
[0140] Table 2: Composition of hydraulic binder systems
[0141]
[0142] 1 Lightly burnt, Nedmag from the Netherlands
[0143] 2 Plasticizer system (citric acid 72%, acetic acid 28%; both reagent grades from Merck)
[0144] experiment procedure
[0145] The calcined alumina was converted into a slurry by adding magnesia, plasticizer system and water with thorough mixing. The final mixture was poured into plastic molds and stored in an airtight container at room temperature for 27 hours. The curing time of the mixture was determined by the Vicat apparatus test. The apparent density (measured from the weight and volume of the specimen) and the cold compressive stre...
Embodiment 2
[0151] Example 2: Effect of the amount of magnesium oxide on the curing of alpha alumina concrete
[0152] Table 5: Composition of self-flowing α-alumina concrete
[0153] Composition of concrete [wt%]
components
Particle size D 50
39.0
Calcined α-alumina T60 1
1-3mm
7.8
Calcined α-alumina T60 1
0.5-1mm
15.0
Calcined α-alumina T60 1
<0.5
8.86
Calcined α-alumina T60 1
<45μm
23.45
Binder system according to table 6
–
5.63-5.65
add water
–
[0154] 1 Almatis GmbH from Germany
[0155] Table 6: Composition of hydraulic binder systems
[0156]
[0157] 2 Lightly burnt, Nedmag from the Netherlands
[0158] 3 Trisodium citrate, reagent grade
[0159] experiment procedure
[0160] A homogeneous slurry is first produced by adding the plasticizer system to the calcined alumina and adding water with thorough mixing. The slurry is then mixed with calcined alpha a...
Embodiment 3
[0164] Example 3: Effect of the BET specific surface area of magnesium oxide on the curing of α-alumina concrete
[0165] Table 8: Composition of self-flowing α-alumina concrete
[0166] Composition of concrete [wt%]
components
Particle size D 50
38.9
Calcined α-alumina T60 1
1.0-3.0mm
7.9
Calcined α-alumina T60 1
0.5-1.0mm
14.9
Calcined α-alumina T60 1
<0.5mm
8.9
Calcined α-alumina T60 1
<45μm
23.8
Binder system according to table 9
–
5.6
add water
–
[0167] 1 Almatis GmbH from Germany
[0168] Table 9: Composition of hydraulic binder systems
[0169]
[0170] 2 Lightly burnt, Nedmag from the Netherlands
[0171] 3 65-87.5wt% polycarboxylate ether (PCE), 12-32.5wt% citric acid, 0.1-1.4wt% sulfamic acid, 0.1-1.4wt% silicon dioxide (such as 66.7wt% CASTAMENT FS 20 and 33.3 wt% CastamentFS 10, both available from BASF SE).
[0172] The tests were perfo...
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