SCHOMBURG GmbH & Co. KG
Tel: +49 5231 953 00 Fax: +49 5231 953 333
Product Sheet 2
SCHOMBURG WATERPROOF CONCRETE CONSTRUCTION SYSTEM
This Agrément Certificate Product Sheet(1) relates to
BETOCRETE-CP-360-WP, a combined water resisting pore
blocker and crystalline waterproofing admixture powder
for use in concrete mixes to provide watertight concrete
suitable for basements, roofs, swimming pools, tunnels
(1) Hereinafter referred to as ‘Certificate’.
• factors relating to compliance with Building Regulations
• factors relating to additional non-regulatory information
• independently verified technical specification
• assessment criteria and technical investigations
• design considerations
• installation guidance
• regular surveillance of production
• formal three-yearly review.
KEY FACTORS ASSESSED
Water penetration and absorption, and water vapour permeability — concrete containing the
product has reduced permeability when compared with the equivalent plain concrete
(see sections 6 and 7).
Reinforcement protection — concrete containing the product has enhanced resistance to
reinforcement corrosion when compared with the equivalent plain concrete (see section 8).
Mechanical properties — the mechanical properties of the concrete are not adversely affected by the incorporation of
the product (see section 9).
Durability — concrete containing the product is more durable than the equivalent plain concrete owing to its reduced
permeability (see section 18).
The BBA has awarded this Certificate to the company named above for the product described herein. This product
has been assessed by the BBA as being fit for its intended use provided it is installed, used and maintained as set
out in this Certificate.
On behalf of the British Board of Agrément
Date of First issue: 15 April 2020
Chief Executive Officer
The BBA is a UKAS accredited certification body – Number 113.
The schedule of the current scope of accreditation for product certification is available in pdf format via the UKAS link on the BBA website at www.bbacerts.co.uk
Readers MUST check the validity and latest issue number of this Agrément Certificate by either referring to the BBA website or contacting the BBA directly.
Any photographs are for illustrative purposes only, do not constitute advice and should not be relied upon.
British Board of Agrément
Herts WD25 9BA
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tel: 01923 665300
In the opinion of the BBA, the use of BETOCRETE-CP-360-WP is not subject to the national Building Regulations.
Construction (Design and Management) Regulations 2015
Construction (Design and Management) Regulations (Northern Ireland) 2016
Information in this Certificate may assist the client, designer (including Principal Designer) and contractor (including
Principal Contractor) to address their obligations under these Regulations.
3 Delivery and site handling (3.1, 3.2, 3.4 and 3.5) and 22 Placing (22.1) of this Certificate.
NHBC Standards 2020
In the opinion of the BBA, BETOCRETE-CP-360-WP, if installed, used and maintained in accordance with this Certificate,
can satisfy or contribute to satisfying the relevant requirements in relation to NHBC Standards, Chapter 5.4
Waterproofing of basements and other below ground structures.
Unless it can be demonstrated that the water table is permanently below the underside of the slab, the product should
be used in combination with either a Type A or C waterproofing protection where Grade 3 protection is required and
the below ground wall retains more than 600 mm (measured from the top of the retained ground to the lowest finished
The Certificate holder has taken the responsibility of CE marking the product, in accordance with harmonised European
Standard BS EN 934-2 : 2009, Table 9.
BETOCRETE-CP-360-WP is a combined water resisting pore blocker and crystalline waterproofing admixture powder for
incorporation into concrete mixes, to enhance the water resistance and durability properties of the hardened concrete.
2.1 The product is manufactured by a blending process.
2.2 As part of the assessment and ongoing surveillance of product quality, the BBA has:
agreed with the manufacturer the quality control procedures and product testing to be undertaken
assessed and agreed the quality control operated over batches of incoming materials
monitored the production process and verified that it is in accordance with the documented process
evaluated the process for management of nonconformities
checked that equipment has been properly tested and calibrated
undertaken to carry out the above measures on a regular basis through a surveillance process, to verify that the
specifications and quality control operated by the manufacturer are being maintained.
2.3 The management system of Schomburg GmbH & Co. KG has been assessed and registered as meeting the
requirements of BS EN ISO 9001 : 2015 by TÜV Rheinland Cert GmbH (Certificate 01 100 6383/05).
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3 Delivery and site handling
3.1 BETOCRETE-CP-360-WP is supplied in 700 or 17 kg plastic bags. The bags are packed 42 onto a pallet, the total
pallet weight being approximately 720 kg.
3.2 Each container bears the manufacturer’s name, product name, batch number, Health and Safety information, and
the BBA logo incorporating the number of this Certificate.
3.3 The product must be stored in sealed original containers in a dry environment at temperatures between 5 and
25°C. The product has a shelf-life of 12 months when stored under these conditions.
3.4 The Certificate holder has taken the responsibility of classifying and labelling the product under the CLP Regulation
(EC) No 1272 / 2008 on the classification, labelling and packaging of substances and mixtures. Users must refer to the
relevant Safety Data Sheet(s).
3.5 When handling, the normal Health and Safety procedures associated with cementitious materials should be
Assessment and Technical Investigations
The following is a summary of the assessment and technical investigations carried out on BETOCRETE-CP-360-WP.
4.1 BETOCRETE-CP-360-WP is satisfactory for use in concrete mixes at an addition of 0.9% by weight of cement to
provide watertight concrete for basements, roofs, swimming pools, tunnels and culverts.
4.2 The effects of the product on the properties of concrete designed to BS EN 480-1 : 2014 is shown in Table 1 of this
Table 1 Effects of the product on the properties of fresh wet concrete(1)
Plastic density (kg·m-3)
Air content (%)
BETOCRETE-CP-360-WP (0.9% wt/wt
(1) The specific effect of the product on these properties, for a particular mix and site conditions, should be evaluated through site specific
trials prior to use.
4.3 Concrete containing the product should be designed in accordance with BS EN 206 : 2013 and BS 8500-2 : 2015, for
use as all normal types, including precast, pre-stressed, post-tensioned, ready-mixed, reinforced, slip-formed, sprayed
and pump concretes.
4.4 The product is compatible with cement blends containing pulverised-fuel ash, ground granulated blast furnace slag
and silica fume blends, as defined in BS EN 197-1 : 2011.
4.5 The use of the product with an air-entraining agent is outside the scope of this Certificate.
5 Practicability of installation
Concrete mixes containing the product can be placed, compacted and cured by operatives with experience of using
conventional concreting methods and equipment.
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6 Water penetration and absorption
6.1 Concrete containing the product has greater resistance to water penetration and water absorption than the
equivalent plain concrete.
6.2 Tests on concrete containing the product, at an addition rate of 0.9% by weight of cement, showed a water
permeability(1) of 7.45 x 10-13 m∙s-1, compared with 7.74 x 10-13 m∙s-1 for control concrete.
6.3 Tests on concrete containing the product, at an addition rate of 0.9% by weight of cement, showed a capillary
absorption(1) of 49% by mass of the control concrete at 7 days, and 58% by mass of the control concrete at 90 days.
(1) The specific effect of the product on these properties, for a particular mix and site conditions, should be evaluated through site trials prior to use.
7 Water vapour permeability
7.1 Concrete containing the product has a lower permeability to water vapour than that of the equivalent plain
7.2 Tests on concrete containing the product at an addition of 0.9% by weight of cement showed a water vapour
permeability(1) of 687 x 10-12 g·m(N·s)-1 compared with 761 x 10-12 g·m(N·s)-1 for control concrete.
(1) The specific effect of the product on these properties, for a particular mix and site conditions, should be evaluated through site trials prior to use.
7.3 Concrete made with a high water/cement ratio can have a water vapour permeability greater than
3000 x 10-12 g·m(N·s)-1. The permeability of concrete is strongly dependent on the exact mix design, and the figures
given in section 7.2 indicate the levels that can be obtained using the product.
7.4 The appropriate thickness for concrete with a specific permeability to achieve a water vapour resistance of 200 or
500 MN∙sg-1(1) (suitable for grade 3 to BS 8102 : 2009) is given by:
For 200 MN∙sg-1, t=0.2 x 1012 x p
For 500 MN∙sg-1, t=0.55 x 1012 x p
is the concrete thickness in mm
is the water vapour permeability in g∙m(N∙s)-1 (from tests to BS 3177 : 1959).
(1) This figure may be used where a high resistance to water vapour is required.
8 Reinforcement protection
8.1 The high level of alkalinity required to prevent corrosion of the reinforcement (pH > 13) will not be adversely
affected by the incorporation of the product in the concrete.
8.2 Corrosion of the reinforcement is normally caused by the ingress of chloride to the steel or by the reduction in
alkalinity of the concrete by the diffusion of carbon dioxide. The reduced permeability of concrete containing the
product will slow down diffusion of aggressive agents into the concrete and so provide improved protection against
8.3 The Certificate holder has declared the chloride ion content of the product as <0.1%.
8.4 The Certificate holder has declared that the product complies with the corrosion behaviour requirements given in
BS EN 934-1 : 2008, Clause 5.1, and is labelled accordingly.
9 Mechanical properties
The compressive strength, flexural strength and static modulus of elasticity of concrete containing the product is similar
to that of the equivalent plain concrete.
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10 Drying shrinkage and wetting expansion
10.1 The drying shrinkage and wetting expansion of concrete containing the product is reduced compared with that of
the equivalent plain concrete.
10.2 Tests conducted on concrete containing the product showed a drying shrinkage(1) of 0.034% compared with
0.046% for control concrete, and a wetting expansion(1) of 0.020 % compared with 0.021% for control concrete.
(1) The specific effect of the product on these properties for a particular mix and site conditions should be evaluated through site trial prior to use.
11 Setting characteristics and hardening
11.1 The effect of the product for a specific mix and site conditions should be evaluated through site trials prior to use.
11.2 The setting time of concrete mixes containing the product will be similar to an equivalent plain concrete. The
setting time will depend on the concrete mix design used and the ambient temperature during placing and curing.
12 Carbonation resistance
Concrete containing the product has greater resistance to carbon dioxide diffusion than the equivalent plain concrete.
13 Frost resistance
Concrete containing the product has similar resistance to freeze/thaw to that of the equivalent plain concrete.
14 Sulfate resistance
The lower permeability of concrete containing the product will reduce the ingress of sulfates. However, if sulfateresistant concrete is required, the advice of the Certificate holder should be sought.
15 Alkali silica reaction (ASR)
15.1 Concrete containing the product should be designed in accordance with BS EN 206 : 2013 Section 126.96.36.199 and
BS 8500-2 : 2015 Clause 5.2.
15.2 The sodium oxide equivalent of the product, when measured in accordance with BS EN 480-12 : 2005, was 1.11%
by mass of admixture. The Certificate holder’s declared value of ≤8.5 % should be used when calculating the
contribution of the product to the total alkali content of a given concrete mix. In turn, this can be used to assess the
susceptibility of that concrete to alkali-silica reaction.
16 Resistance to leaching
Use of the product will reduce the leaching of lime from the hydrated cement in concrete.
For a specific installation, the maintenance regime should be considered to ensure that the required design life of the
concrete is achieved.
18.1 Under normal conditions of service, concrete containing the product is more durable than the equivalent plain
concrete, owing to its reduced permeability.
18.2 Where exposure to aggressive soil conditions or chemicals is anticipated, a full assessment of the site should be
made. In these situations, the Certificate holder should be consulted on the suitability of the product.
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19.1 When used in concrete mixes, the product enhances durability and improves protection against reinforcement
corrosion by providing the concrete with reduced permeability that protects against water ingress via absorption and
19.2 The use of the product will produce a concrete with the following properties relative to a control:
increased water resistance
increased corrosion resistance.
19.3 The product has no known detrimental effect on the properties of concrete.
19.4 Structures built incorporating the product should be designed to the relevant clauses of BS 8102 : 2009, and
BS EN 1992-1-1 : 2004, BS EN 1992-1-2 : 2004 and BS EN 1992-3 : 2006 and their UK National Annexes.
19.5 The product is suitable for Type B constructions as defined in BS 8102 : 2009, and can satisfy the requirements for
all grades defined in Table 2 of this Standard. For Grade 3 (where control of water vapour is required), it will be
necessary to provide the mix with a sufficiently low vapour permeability in combination with an adequate section
thickness (see sections 7.2 and 7.3). The use of suitable ventilation, dehumidification or air conditioning, appropriate to
the intended use, must also be considered.
19.6 Basements for dwellings should be designed in accordance with the guidance given in the Guidance Document —
Basements for dwellings(1).
(1) Published by Basement Information Centre, Product code: TBIC/007.
20 Mix design
20.1 Concrete containing the product is normally supplied as ready-mixed concrete but may be prepared on sites
where there is adequate mix control(1). Preparation of concrete on site should be carried out in accordance with
BS 8000-0 : 2014, the Certificate holder’s instructions and this Certificate.
(1) NHBC will only accept use of the admixture where included at the concrete batching plant which must also be either QSRMC or BSI Kitemark
20.2 The concrete must have a minimum cement content of 350 kg·m–3 and be batched with a maximum
water/cement ratio of 0.43. Further details of suitable mixes can be obtained from the Certificate holder.
20.3 Once the fresh concrete is mixed, further materials must not be added.
20.4 The workability of concrete can be adjusted using a suitable(1) water reducing or superplasticising admixture
complying with BS EN 934-2 : 2009, to ensure that the maximum water/cement ratio given in section 20.2 of this
Certificate is not exceeded. Specific admixtures have not been considered and are outside the scope of this Certificate.
(1) The Certificate holder’s advice should be sought regarding the suitability and compatibility of water-reducing or superplasticising admixtures.
Admixtures should be evaluated before use and site trials should be carried out to establish the appropriate dose required.
21 Site mixing
21.1 The product is added to the mixer at the correct dose (see section 4.1) prior to batching the concrete constituents.
21.2 When an additional superplasticiser is required, it must be added after the addition of the product and in
accordance with the supplier’s recommendations.
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21.3 The resulting concrete should be mixed for a minimum of five minutes and in accordance with the Certificate
holder’s instructions, to ensure even distribution of the product throughout the concrete.
21.4 Where the product is to be added to concrete on site, care must be taken to ensure that adequate mix control is
22.1 Concrete containing the product should be placed in the same way as normal concrete, in accordance with
BS 8000-0 : 2014, BS EN 13670 : 2009, the Certificate holder’s Health and Safety guidance and the normal routine
precautions for handling concrete.
22.2 Concrete containing the product should not be placed at temperatures of 5°C or below.
22.3 Concrete containing the product mix should be fully compacted.
The concrete must be cured strictly in accordance with BS EN 13670 : 2009, and BS EN 1992-1-1 : 2004 and its UK
National Annex, and the Certificate holder’s recommendations (where site specific information exists).
24.1 Joints must be designed with waterstops as recommended in BS 8102 : 2009, to maintain the watertightness of
the whole structure. The advice of the Certificate holder should be sought on particular applications.
24.2 Penetrations of the concrete, such as pipe entries or formwork ties, must also be securely sealed to maintain
watertightness. The Certificate holder can advise on suitable systems.
When water-based products are used to coat the hardened concrete, a bonding agent may be required. For specific
cases, advice should be sought from the Certificate holder. These are outside the scope of the Certificate.
26.1 Tests were carried out and the results assessed to determine the effect of the product on the properties of
concrete designed in accordance with BS EN 480-1 : 2014.
26.2 Tests were carried out and the results assessed to determine the characteristics of fresh concrete, including:
26.3 Tests were carried out and the results assessed to determine the characteristics of hardened concrete, including:
bond to steel
water vapour permeability
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modulus of elasticity
liquid water permeability.
26.4 Tests carried out for the characterisation of BETOCRETE-CP-360-WP admixture including:
homogeneity and colour
water soluble chloride
alkali content (Na2O equivalent)
The manufacturing process was evaluated, including the methods adopted for quality control, and details were
obtained of the quality and composition of the materials used.
BS 3177 : 1959 Method for determining the permeability to water vapour of flexible sheet materials used for packaging
BS 8000-0 : 2014 Workmanship on construction site — Introduction and general principles
BS 8102 : 2009 Code of practice for protection of below ground structures against water from the ground
BS 8500-2 : 2015 + A1 : 2016 Concrete — Complementary British Standard to BS EN 206 — Specification for constituent
materials and concrete
BS EN 197-1 : 2011 Cement — Composition, specifications and conformity criteria for common cements
BS EN 206 : 2013 + A1 : 2016 Concrete — Specification, performance, production and conformity
BS EN 480-1 : 2014 Admixtures for concrete, mortar and grout — Test methods — Reference concrete and reference
mortar for testing
BS EN 480-12 : 2005 Admixtures for concrete, mortar and grout — Test methods — Determination of alkali content of
BS EN 934-1 : 2008 Admixtures for concrete, mortar and grout — Common requirements
BS EN 934-2 : 2009 Admixtures for concrete, mortar and grout — Concrete admixtures — Definitions and requirements,
conformity, marking and labelling
BS EN 1992-1-1 : 2004 Eurocode 2 : Design of concrete structures — General rules and rules for buildings
NA to BS EN 1992-1-1 : 2004 UK National Annex to Eurocode 2 : Design of concrete structures — General rules and rules
BS EN 1992-1-2 : 2004 Eurocode 2 : Design of concrete structures — General rules — Structural fire design
NA to BS EN 1992-1-2 : 2004 UK National Annex to Eurocode 2: Design of concrete structures — Structural fire design
BS EN 1992-3 : 2006 Eurocode 2: Design of concrete structures — Liquid retaining and containing structures
NA to BS EN 1992-3 : 2006 UK National Annex to Eurocode 2: Design of concrete structures — Liquid retaining and
BS EN 13670 : 2009 Execution of concrete structures
BS EN ISO 9001 : 2015 Quality management systems — Requirements
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Conditions of Certification
28.1 This Certificate:
• relates only to the product/system that is named and described on the front page
• is issued only to the company, firm, organisation or person named on the front page – no other company, firm,
organisation or person may hold or claim that this Certificate has been issued to them
• is valid only within the UK
• has to be read, considered and used as a whole document – it may be misleading and will be incomplete to be
• is copyright of the BBA
• is subject to English Law.
28.2 Publications, documents, specifications, legislation, regulations, standards and the like referenced in this
Certificate are those that were current and/or deemed relevant by the BBA at the date of issue or reissue of this
28.3 This Certificate will remain valid for an unlimited period provided that the product/system and its manufacture
and/or fabrication, including all related and relevant parts and processes thereof:
• are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA
• continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine
• are reviewed by the BBA as and when it considers appropriate.
28.4 The BBA has used due skill, care and diligence in preparing this Certificate, but no warranty is provided.
28.5 In issuing this Certificate the BBA is not responsible and is excluded from any liability to any company, firm,
organisation or person, for any matters arising directly or indirectly from:
• the presence or absence of any patent, intellectual property or similar rights subsisting in the product/system or any
• the right of the Certificate holder to manufacture, supply, install, maintain or market the product/system
• actual installations of the product/system, including their nature, design, methods, performance, workmanship and
• any works and constructions in which the product/system is installed, including their nature, design, methods,
performance, workmanship and maintenance
• any loss or damage, including personal injury, howsoever caused by the product/system, including its manufacture,
supply, installation, use, maintenance and removal
• any claims by the manufacturer relating to CE marking.
28.6 Any information relating to the manufacture, supply, installation, use, maintenance and removal of this
product/system which is contained or referred to in this Certificate is the minimum required to be met when the
product/system is manufactured, supplied, installed, used, maintained and removed. It does not purport in any way to
restate the requirements of the Health and Safety at Work etc. Act 1974, or of any other statutory, common law or
other duty which may exist at the date of issue or reissue of this Certificate; nor is conformity with such information to
be taken as satisfying the requirements of the 1974 Act or of any statutory, common law or other duty of care.
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