Sika WT Series Water Resisting and Crystalline Waterproofing Concrete Admixture

Excellence in Waterproof Concrete

with Sika WT Series

TechnologyImpermeability of concrete against water is determined by the imper-

meability of the binder matrix, i.e. capillary porosity. These capillaries

are the voids created by the excess water in the concrete that is not

necessary for the chemical reaction for hardening known as hydration.

These pores are the potential migratory paths for water through the

concrete. Therefore concrete can be described as a porous material

that allows the passage of water through a structure of capillary pores.

The addition of a water resisting admixtures is one measure to improve

the impermeability of the concrete. For waterproof concrete Sika WT

series can be added, which consists of special components. These

active components will form non-soluble materials throughout the

pore and capillary structure of the concrete and seal the concrete

permanently against penetration of water and other liquids. In addition

the special formula and ingredients of Sika WT-200 series enhances

the self-healing properties of concrete and will improve the ability to

heal concrete cracks.

60.0

40.0

20.0

Wat

er p

enet

ration

dep

th [

mm

]

Significant reduction of water penetration depth

with Sika WT Series

10.0

30.0

Reference Concrete with

Sika WT-100

0Concrete with

Sika WT-200

10

8

3

Wat

er c

onduct

ivity

[g/(

m

x h)]

Significant reduction of water conductivity

with Sika WT Series

1

5

12

0

Reference Concrete with

Sika WT-100

Concrete with

Sika WT-200

6

2

4

Tests have been conducted according to EN 12390-8.

Sika Recommendation: 30 mm Sika Recommendation: 6 g/(m x h)

Tests have been conducted according to SIA 262 Annex A.

50.0

11

9

7

According to the EN 12390-8 the waterpenetration depth tests

has to be conducted over 72 hours with a water pressure of 5

bar. In order to gain knowledge after these three days the same

tests have been performed with extended testing time up to

28 days. The above graph shows the results of these extended

tests.

Requirements The water impermeability of a construction is determined by fulfillment

of the decisive requirements regarding limitation of water permeability

through the concrete. With the use of Sika WT Series the Water penetration depth Water conductivity Water absorption Self-healing propertiesof a concrete can be positively enhanced.

Water Resisting AdmixtureSika WT series is based on two technologies: Sika WT-100 series

Sika pore blocking technology Sika WT-200 series Sika crystalline & pore blocking technology

Benefits of the Sika WT SeriesThe use of Sika WT series in waterproof concrete results in the

following advantages: Increase in service life of the construction Significantly improved durability and sustainability of the hardened concrete Ensured watertightness without other expensive measures Reduced maintenance costs Sika WT-200 series additionally enhances the self-healing properties of concrete and promotes the ability to heal concrete

cracks

15

10

5

0

20151050

time [d]

3025

Wate

r penetr

ation d

epth

[m

m]

30

25

20

3

EN

12390-8

Components Example formula

Aggregates All aggregate sizes are possible

Cement Any cement meeting local standards 350 kg/m

Powder additives Sufficient fines content by adjustment of

the binder content

Water content w/c-ratio according to

standards with regard to

exposure class

< 0.45

Concrete admixtures Sika ViscoCrete or

SikaPlast or

Sikament

0.60 1.50%

Sika WT 1.00 2.00%

Installation requirements

and curing

Subsequent curing to ensure high quality

(compactness) of surfaces

Sika Antisol

Mix Design Recommendation:

Our most current General Sales

Conditions shall apply.

Please consult the Product Data Sheet

prior to any use and processing. S

ika

Ser

vice

s A

G /

BU

Con

cret

e /

Sik

a W

T s

erie

s /

01

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13

/ C

MS

-51

8 /

ID: 3

19

95

Sika Services AG

Business Unit Concrete

Tffenwies 16

CH-8048 Zrich

Switzerland

Phone +41 58 436 40 40

Fax +41 58 436 41 50

www.sika.com

Sika Solutions for Watertight Concrete SystemThe Sika Watertight Concrete System offers a comprehensive solution for watertight structures. The system consists of concrete that

has been specially modified with Sika admixtures to produce waterproof concrete; and carefully selected waterstops for construction and

movement joints. Watertight concrete structures can be designed to keep water in or out or both. The need to maximize design flexibility

has led clients and specifiers to look below ground as an alternative, whether for basement parking or a habitable environment.

Sika waterproof concrete admixture Sika ViscoCrete / SikaPlast / Sika WT

Construction joints (non-movement) SikaSwell

Movement joints Sika Waterbar

Formwork tie bar hole sealing Sikadur-31

Concrete curing Sika Antisol

Structures and Applications The Sika Watertight Concrete System can be used for all types of

below-ground structures, including habitable basements, car parks

and areas for business use. As with all below-ground structures,

adequate ventilation and air conditioning should be appropriate to

the intended use.

Keeping water OUT Kepping water IN

Basements Swimming pools

Habitate basements Water retaining structures

Parking garages Dams

Utility / plant rooms Water structures

Tunnels Waste water treatment structures

Sika Watertight Concrete System Components:

Crack sealing (non-injection) Sikadur-Combiflex SG