Test Report of Metakaolin
Test Report of Metakaolin
Test Report of Metakaolin
At present, metakaolin, as the high active mineral additive of concrete, is widely used
in the production. The content of SiO2 and Al2O3 is very high. Besides the filling
reaction of metakaolin powder and hydration promotion for portland cement, SiO 2
and Al2O3 react with Ca(OH)2 , then form C-S-H polymer, hydrated calcium aluminate
and Calcium sulfoaluminate hydrates. As it has very high pozzolanic activity, so it’s
also named Super volcanic ash.
Inner Mongolia Super Kaolin Co.,Ltd is specially producing and distributing
superfine calcined kaolin industry. KAOPOZZ TM metakaolin is produced with high
quality raw material, with several purification process, calcined under certain
condition, then produced cream white metakaolin (Al2O3.2SiO2), with extremely high
volcanic activity. China Building Material Academy tested KAOPOZZ TM sample,
present the application and technical properties of KAOPOZZ TM used in mortar and
cement for the promotion and application in future’s project. The main test results are
as following:
I. KAOPOZZTM K1100 Physical and Chemical Analysis
1. Test material
2. Test method
Test SiO2 content and specific area (BET nitrogen adsorption method) according to
Material>;Test Al2O3, Fe2O3, CaO, MgO and total amount of alkali according to
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The physical and chemical test table 1 between KAOPOZZTMK1100 Metakaolin and silica
fume.
SiO2 Al2O3 Fe2O3 CaO MgO Cl- Total amount of Specific Area
Item
% % % % % % alkali,% m2/g
Strength and High Performance Concrete Mineral Admixture>, test the activity of
metakaolin( add 0, 5%, 10%, 15% ,20%), Silica Fume from Gansu( add 10%), make
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comparison of water demand and active index (3d, 7d, 28d).
No. 3d 7d 28d
1 100 100 100
5 87 107 122
6 82 106 121
7 77 79 106
(5%,10%,15%,20%), to get the same mobility like base mortar( No.1) , the water
demand increased from 227g to 263g. The water demand ratio increased from101% to
117%. This means KAOPOZZTMK1100 metakaolin has bigger specific area, so the
bigger water demand, so if added into mortar or concrete, will increase the water
demand. The mortar with 10% silica fume(NO.7), to get the same mobility like base
mortar( No.1) , the water demand is 279g, the water demand ratio is 124%.
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Compared the mortar with 10% metakaolin(No.3) and with 10% silica fume(No.7),
the water demand ratio with 10% metakaolin is 107%, and that with 10% Silica fume
metakaolin(5%,10%,15%,20%), the active index are all higher. For that in 7d and 28d,
the active index are all over 100%, this means if add certain KAOPOZZ TMK1100
metakaolin into mortar and concrete, it will increase the compressive strength of
mortar and concrete. Compared the mortar with 10% metakaolin(NO.3) and 10%
silica fume(NO.7), the active index in 3d, 7d, 28d with 10% metakaolin are all higher
than that with 10% silica fume. That means for mortar application,
KAOPOZZTMK1100 metakaolin has higher active Al2O3, In the early stage of cement hydration,
the activity of Al2O3 was provided, then formed sufficient Needle like Calcium Vanadium Ore Crystal
aggregate structure, shorten cement setting time, accelerated hydration, to have higher early activity and
volcanic ash effect. Meanwhile because of the bigger specific area, finer particles, it has better filling effect.
TM
The mortar test result shows KAOPOZZ K1100 metakaolin has very high active index, the
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III. Concrete Test
1250mesh.
Poly carboxylic acid high performance water reducer: Shanxi Huangteng Chemical
CO.,Ltd. produced the early - consolidation poly carboxylic acid high performance
water reducer.
Test the concrete mixture properties(Slump, slump-loss, expansion, bleeding rate and
change of gas content) according to GB/T 50080-2002< Standard Test Method for the
Make test of concrete resistance to chloride ion permeability( Electric flux method),
rapid freezing and thawing test, and drying shrinkage test by GB/T50082-2009
<Standard for test method for long - term performance and durability of ordinary
concrete>.
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Choose the water - binder than 0.40 a different mixture ratio,added with different
amount of metakaolin (10%, 15%) and 8% silica fume in concrete and adjust the
additive dosage, and matched with the reference concrete group of the same
workability, to test concrete slump and slump loss, expansion, bleeding rate,
containing gas mixture , and for the hardened concrete, test intensity, flux, rapid
Choose the water - binder than 0.30 a different mixture ratio,added with different
amount of metakaolin (10%, 15%) and 8% silica fume in concrete and adjust the
additive dosage, and matched with the reference concrete group of the same
workability, to test concrete slump and slump loss, expansion, bleeding rate,
containing gas mixture , and for the hardened concrete, test intensity, flux, rapid
The water cement ratio is 0.40, 0.30 of the proportion and the results are shown in Table 4, 5.
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freezing-
compressive strength,MPa thawing 300
Poly 28d 28d
Sand Contain 次
cement Meta Silica Rubble Water carbo- Expansi 30min electri Shrink
No , Slump bleeding in-g gas Dynami
, kaolin, fume, ,kg/ , xylic -on, Slump -c age
. kg/m , mm rate,% mixture - mass
kg/m3 kg/m3 kg/m3 m3 kg/m3 acid , mm , mm flux, value
3
, % 1d 3d 7d 28d 60d cmodu- loss
kg/m 3
C ×10-4
lus, ,%
%
1 430 0 0 745 1060 173 4.3 230 600 180 5.5 3.0 15.8 35.4 46.2 54.4 59.8 579 73.1 3.3 2.56
2 387 43 0 713 1092 173 4.6 215 510 170 0 3.2 15.7 42.3 55.2 67.6 70.9 389 83.2 2.2 2.40
3 365.5 64.5 0 695 1110 173 5.0 220 480 160 0 3.3 17.1 43.6 57.2 69.3 72.7 376 84.7 2.1 2.60
4 395.6 0 34.4 713 1092 173 4.8 215 500 160 0 3.4 15.6 39.9 51.6 64.2 68.4 441 80.3 2.8 2.76
Table 4 The property test result for 0.40 the water cement ratio Concrete and mixture Table 5
The property test result for 0.30 the water cement ratio Concrete and mixture
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Poly
Expa Contain compressive strength,MPa 28d
Meta Silica Rubble carbo- 30min
No cement, Sand, Water, Slump nsi- bleedin in-g gas Shrinkag
kaolin fume, ,kg/ xylic Slump,
. kg/m3
kg/m 3
kg/m 3
, mm on, g rate,% mixture e value
, kg/m3 kg/m3 m3 acid , mm 1d 3d 7d 28d 60d
mm , % ×10-
kg/m3
5 504 0 0 700 1104 150 7 225 590 230 4.0 1.2 25.3 50.8 62.6 69.8 72.9 1.96
6 453.6 50.4 0 668 1136 150 7.6 220 550 200 0 1.7 23.4 51.3 73.3 81.2 85.7 2.20
7 428.4 75.6 0 650 1154 150 8.0 210 520 170 0 2.0 20.5 49.7 72.8 79.9 84.2 2.28
8 463.7 0 40.3 668 1136 150 7.6 220 575 205 0 1.8 18.8 48.9 64.9 76.4 82.1 2.66
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Analyse the test result in table 4 and 5, because the specific area of silica fume and
reducer slightly,can adjust concrete flowability. Add silica fume and metakaolin, can
improve the concrete bleeding performance, prevent bleeding and segregation. There
is no effect on concrete gas content when add silica fume and metakaolin.
Analysis from Table 4 test result, when the concrete water binder ratio is 0.4, add 15%
KAOPOZZTMK1100 metakaolin, can improve the early strength and later strength,
and the effect is better than the concrete with 8% silica fume. With
resistance and durability improved. The drying shrinkage value of concrete with 10%
and 15% metakaolin concrete is smaller than that with 8% silica fume. Can reduce the
Analysis from Table 5 test result, when the concrete water binder ratio is 0.3, add 10-
15% KAOPOZZTMK1100 metakaolin, can improve the early strength and later
strength, and the effect is better than the concrete with 8% silica fume. With
resistance and durability improved. The drying shrinkage value of concrete with 10%
-15% metakaolin concrete is smaller than that with 8% silica fume. The test result is
KAOPOZZTMK1100 metakaolin, just add admixture slightly, can compensate the loss
of working performance, increase the early strength and later strength, and improve
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concrete durability.
1250mesh.
Make the test of inhibition of the activity of alkali - silica reaction by GB/T 50733-
During test, because of metakaolin, the mortar mobility is lowered, so add dosage of
high efficiency water reducer, to improve mortar mobility, meet the requirements of
mortar forming. The test result for the inhibition of the activity of the alkali - silica
Table 6 Test results on the inhibition of the activity of alkali - silica reaction
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High
g
1 440 0 990 180.0 0 28.2 106 0.226
2 396 44 990 206.8 1.5 0 112 0.028
3 374 66 990 206.8 2 0 115 0.022
Analysis the test result of Table 6, The No.1 test result shows, the 14d expansion of
the rubble from Hebei Sanhe is 0.226%, is reactive aggregate for alkali silica reaction;
No.2 and 3 shows, after add 10%, 15% KAOPOZZ TMK1100 metakaolin, 14 d
expansion is 0.026% and 0.020%, all below 0.03%. According to the requirement of
metakaolin can inhibit rubble Alkali - silica reaction activity. That means in the
aggregate.
River sand: Jixian,Tianjin, the fineness modulus is 2.8 in the medium sand,
continuous gradation;
1250mesh.
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Poly carboxylic acid high performance water reducer: Shanxi Huang Teng Chemical
Co.,Ltd produce early strength poly carboxylic acid high performance water reducer.
After the concrete is formed, steam-cured with below curing system: stop for 2 hours,
improve temperature ( 20℃ to 80℃) for 2 hours, keep 80℃ for 5 hours, then lower
the temperature, after 2 hours, make the concrete compressive strength test.
Poly Compressive
Meta Silica
Cement, Sand, Rubble,k Water, carboxylic Slump strength
No. kaolin, fume,
kg/m 3
kg/m 3
g/m3
kg/m 3
acid , , mm after steam-
kg/m3 kg/m3
kg/m 3
cured ,MPa
replacing cement, the sand ratio of concrete can be lowered in a certain extent. If
slightly increase poly carboxylic acid high performance water reducer, adjust slump
constant to 30-50mm; after using 8% silica fume replacing cement, the sand ratio of
steam-cured, the compressive strength was 69.6MPa; With 10% metakaolin, the
compressive strength was 83.6MPa. With 8% silica fume, the compressive strength
was 79.5MPa. This means to replace cement with metakaolin and silica fume, both
can improve concrete steam curing strength, but 10% KAOPOZZ TMK1100 metakaolin
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is better than 8% silica fume.
From the above test result with KAOPOZZTM metakaolin, the conclusion is:
1. KAOPOZZTM metakaolin has very high pozzolanic activity, the early and later
activity is higher. If add in mortar and concrete, it’s benefit for improving the early
3. With KAOPOZZTM, can improve concrete compressive strength, suitable for the
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