High-effect Expansion Additive for Concrete
(Type UEA)
Introduction
● Type UEA Expansion Additive for Concrete, is a kind of special admixture for making expansion concrete of Portland Cement, Ordinary Portland Cement and other Portland Cements. Also simply named type U High-effect Expansion Additive for Concrete,
● Type UEA Concrete Expansion Additive not only has very good expansion performance, but also because of its low alkalinity characteristics, can inhibit alkali-aggregate reaction and reduce the slump loss of concrete.
● Type: UEA
Characteristics
● Appearance: off-white powder
● Low alkalinity content: the factual alkalinity content is controlled less than 0.4%
● Low SASOBIT (used quantity): recommended basic volume is only 8% of cement by weight
● Low slump loss of concrete
● Not belong to flammable solids, corrosives, toxic substance, dangerous goods.
● Non-burned
● Free of poisonous heavy metal contents such as chromium(Cr), plumbum(Pb), hydrargyrum(Hg), and chlorine salt composition(Cl) etc.
Alkali Content of Concrete
|
Alkali Content of Expansion Admixture |
Standard Mixing Ratio |
Quantity by weight of Expansion Admixture (C = 400kg/m3) |
Alkali Content following with Expansion Admixture in Concrete |
|
0.3-0.4% |
8% |
32 kg/m3 |
0.096～0.128 kg/m3 |
Technical Data
● As per China JC476-2001 Standard:
|
Items |
Standard Index |
|
Chemical
Composition |
Magnesium Oxide (MgO) (%) ≤ |
5.0 |
|
Water Ratio (%) ≤ |
3.0 |
|
Total Alkali Content (%) ≤ |
0.75 |
|
Chlorine Ion (%) ≤ |
0.05 |
|
Physical Performance |
Fineness |
Specific Surface (m2/kg) ≥ |
250 |
|
Residue on 0.08mm Sieve (%) ≤ |
10 |
|
Residue on 1.25mm Sieve (%) ≤ |
0.5 |
|
Setting Time |
Initial Setting (minutes) ≥ |
45 |
|
Final Setting (hour) ≤ |
10 |
|
Limited
Expansion
Ratio |
In Water
(%) |
7 day ≥ |
0.025 |
|
28 day ≤ |
0.10 |
|
In Air (%) |
21 day ≥ |
-0.02 |
|
Compressive Strength (Mpa)
Method A / Method B |
7 day ≥ |
25.0 / 20.0 |
|
28 day ≥ |
45.0 / 40.0 |
|
Breaking Strength (Mpa)
Method A / Method B |
7 day ≥ |
4.5 / 3.5 |
|
28 day ≥ |
6.5 / 5.5 |
|
Note:
1. Fineness is indicated by Specific Surface and Residue on 1.25mm Sieve, or Residue on 0.08mm Sieve; When referee test, Fineness is indicated by Specific Surface and Residue on 1.25mm Sieve.
2. In Method A, applying Primary Standard Cement for testing, In method B, applying 42.5Mpa OPC for testing (C3A 6～8%，R2O ≤1%).
3. The strength value of MFR’s Index is only indicated as per Method A. |
Application
● To confect anti-crack concrete, anti-seepage concrete, shrinkage compensated concrete. It is also suitable for structure self-waterproof concrete project.
● By setting up reinforcing lift, it will be able to reduce to cancel late casting, and reach super-length and seamless construction.
● To make components and products of concrete,
● To make mass concrete of resistance to crack and seepage
● To make anti-seepage outsides of cistern and building, room surfaces of rigidity water proof
● To make expanding concrete and self-stressing concrete
Usage
● As per related criterion to design mix ratio of concrete, used sand ratio of water proof concrete should be not less than 36%;
● Inner mixing quantity:
for resistant cracking, preventing leakage and compensating shrinkage concrete, 8%;
for back-pouring lift (reinforcing lift) and filling concrete, 10%;
for joint concrete, 10-12%;
the lowest mixing quantity is not less than 30kg/m3, the largest mixing quantity is 45 kg/m3.
● All construction must confirm the final mixed quantity as per the factual trial.
● Type U Concrete Expansion Additive can replace cement by same weight; the amount of type U Concrete Expansion Admixture and cement should be more 320kg/m3.
● When C3A content in cement is more 8%, it is necessary to reduce the mixing quantity of type U Concrete Expansion Additive in order to avoid large loss of early strength of concrete.
● After mixing Concrete Expansion Additive, it will cause concrete modest expansion, dry-shrinkage fallen, increasing of resistant cracking ability, reducing hydreat heat, high late strength, grade of resistant leakage >S12, grade of resistant frost >D150, and improving sulfate resistant corrosion ability.
● The mixing time of concrete mixers should be extended half of minute.
● For preventing the stubble surface, after pouring the vibration must be finished in time. And before final setting, using the wood buttering board to rub and press 3 times for preventing coagulating sedimentation and cracking duce to air-dry.
● Moisture-retentive cure time should be 7-14 days.
● In the horizontal stubble position, to pre-add water-stop armor plate. Also as per male and female channel method, first laying 2cm-3cm expansive sand mortar, then pouring new concrete.
● For construction defect, for example beehive, part crackle etc, using expansive sand mortar and expansive concrete to repair it.
● In the position of stress concentration, for example corner, wall under beam, reinforcing strap etc, it is best to add horizontal reinforcing steel bar.
● For thin wall concrete, the heat preservation and to prevent sunlight are necessary. Also to setup back-pouring lift or reinforcing lift in order to preventing crack.
● It is not allowed to singly use U Type Concrete Expansion Additive.
Transport, Storage and Package
● Transport: Classification for conveyance - not required. During the transportation of a large of amount of batteries by ship, trailer or railway, do not leave them in the places of high temperatures and do not allow to exposed to moisture. During the transportation do not allow the packages to be fallen down or damaged.
● Storage: to be stored with intact sack in dry. If the sack open, it should be use soon to avoid to be damaged.
● Package: plastic woven bag with sole PP bag, 25kg/bag, and /or big bag.
