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GB/T 18445: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18445-2025 | English | 320 |
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Cementitious capillary crystalline waterproofing materials
| Valid |
| GB 18445-2012 | English | 369 |
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Cementitious capillary crystalline waterproofing materials
| Valid |
| GB 18445-2001 | English | 359 |
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Cementitious capillary crystalline waterproofing materials
| Obsolete |
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GB/T 18445-2025: Cementitious capillary crystalline waterproofing materials
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18445-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.120.30
CCS Q 17
Replacing GB 18445-2012
Cementitious capillary crystalline waterproofing materials
水泥基渗透结晶型防水材料
Issued on: JUNE 30, 2025
Implemented on: JANUARY 01, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Classification and marking... 7
5 General requirements... 8
6 Technical requirements... 8
7 Test methods... 10
8 Inspection rules... 20
9.Marking, packaging, storage, transportation and shelf life... 21
Appendix A (Normative) Test method for self healing ability of cementitious capillary
crystalline waterproofing admixture... 23
Cementitious capillary crystalline waterproofing materials
1 Scope
This document specifies the classification and marking, general requirements, technical
requirements, test methods, inspection rules, as well as the marking, packaging, storage,
transportation and shelf life of cementitious capillary crystalline waterproofing
materials.
This document applies to powdered cementitious capillary crystalline waterproofing
materials – primarily made of Portland cement – mixed with a certain amount of
activated chemical additive, for use in waterproofing projects of cement concrete
structures.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB 175, Common Portland Cements
GB/T 176, Methods for chemical analysis of cement
GB 8076, Concrete admixtures
GB/T 8077-2023, Methods for testing uniformity of concrete admixtures
GB/T 14684-2022, Sand for construction
GB/T 14685-2022, Pebble and crushed stone for construction
GB/T 17671, Method of testing cements - Determination of strength
GB/T 50081-2019, Standard for test methods of concrete physical and mechanical
properties
GB/T 50082, Standard for test methods of concrete physical and mechanical
properties
JC/T 474-2008, Water-repellent admixture for mortar and concrete
JC/T 547-2017, Adhesives for ceramic tiles
JC/T 681, Mixer for mixing mortars
JC/T 841, Alkali-resistant glass fiber mesh
JG/T 26, Inorganic building coating for external wall
JGJ 63, Standard of water for concrete
JGJ/T 70, Standard for test method of basic properties of construction mortar
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
cementitious capillary crystalline waterproofing materials; CCCW
Rigid waterproofing materials for cement concrete, which contains activated chemical
additives that penetrate the concrete using water as a carrier and, in the presence of
water, react with cement hydration products to form water-insoluble crystals that fill
capillary pores and micro-cracks, thereby improving the density and impermeability of
the concrete.
Note. Cementitious capillary crystalline waterproofing materials are classified into
cementitious capillary crystalline waterproofing coating and cementitious
capillary crystalline waterproofing admixture according to their application
methods.
3.2
cementitious capillary crystalline waterproofing coating
A powdered material made primarily of portland cement and quartz sand, with a certain
amount of activated chemical additives added, which can be mixed with water to form
a slurry that can be brushed or sprayed onto the surface of cement concrete, or can also
be pressed into the surface of cement concrete before initial setting by dry spreading.
3.3
cementitious capillary crystalline waterproofing admixture
A powdered material made primarily of portland cement and activated chemical
additives, which is added during the mixing of cement concrete.
3.4
activated chemical additive
Composed of alkali metal salts or alkaline earth metal salts, complex compounds, etc.,
and can react with the hydration products in cement to form water-insoluble crystalline
chemical substances.
3.5
permeability after removal of sample coat
The permeability measured after removal of coating, which is a cementitious capillary
crystalline waterproofing coating applied on the surface of a reference test piece and
cured for 28 days under the specified curing conditions.
3.6
the second permeability
The permeability measured at the second permeability test of a permeability test piece
of cementitious capillary crystalline waterproofing materials which has been subjected
to the first permeability test where test piece is fully immersed and been cured
continuously in water for 56 days under standard curing conditions.
3.7
self healing ability
The healing phenomenon of a through crack in cement concrete of a certain width under
continuous water flow conditions, which characterizes the healing performance of
cementitious capillary crystalline waterproofing admixture on cement concrete cracks.
Note. Self healing ability is represented by the healing rate (u).
4 Classification and marking
4.1 Classification
According to the method of use, cementitious capillary crystalline waterproofing
materials are divided into cementitious capillary crystalline waterproofing coatings
(code C) and cementitious capillary crystalline waterproofing admixtures (code A).
4.2 Marking
Products are marked in the order of product name code, standard number, and
classification.
Example. Cementitious capillary crystalline waterproofing coatings conforming to this
document shall be marked as shown below.
CCCW GB/T18445-2025 C
5 General requirements
The products covered in this document shall not have any harmful effects on human
health, ecology, environment, or the performance of cement concrete (especially
durability). Safety and environmental protection issues related to their use shall comply
with the relevant standards and regulations of our country.
6 Technical requirements
6.1 Cementitious capillary crystalline waterproofing coating
The performance of cementitious capillary crystalline waterproofing coating shall meet
the requirements of Table 1.
7 Test methods
7.1 General provisions
7.1.1 Raw materials used in the test
7.1.1.1 Reference cement. shall comply with the provisions of GB 8076.
7.1.1.2 Mixing water. shall comply with the provisions of JGJ 63.
7.1.1.3 Sand used for mortar testing. ISO standard sand conforming to GB/T 17671.
7.1.1.4 Fine aggregate for cement concrete testing. medium sand (natural sand) meeting
the requirements of Zone 2 in GB/T 14684-2022, with a fineness modulus of 2.6 ~ 2.9
and a mud content of less than 1%.
7.1.1.5 Coarse aggregate for cement concrete testing. crushed stone with a nominal
particle size of 5 mm ~ 20 mm conforming to GB/T 14685-2022, using a two-stage
gradation, of which 5 mm ~ 10 mm accounts for 40% and 10 mm ~ 20 mm accounts
for 60%, meeting the requirements of continuous gradation, with needle-like and flaky
material content less than 10%, porosity less than 47%, and crushed stone mud powder
content less than 0.5%.
7.1.1.6 Standard concrete slab. conforming to the requirements of Appendix A of JC/T
547-2017.
7.1.1.7 Alkali-resistant glass fiber mesh. conforming to 2 mm × 2 mm holes in JC/T
841; nominal unit area mass, 151 g/m2 ~ 160 g/m2.
7.1.1.8 Water-retaining agent. cellulose ether with a viscosity greater than 20 000 mPa·s.
7.1.2 Mix proportion
7.1.2.1 The reference mix proportions for the reference mortar and reference concrete
used in the preparation of cementitious capillary crystalline waterproofing coating tests
are as follows.
a) Reference mortar mix proportion.
-- Cement. 320 g ~ 340 g;
-- ISO standard sand. 1 350 g;
-- Water. 260 g;
-- Cellulose ether. 0.5 g.
The amount of cement used shall be adjusted according to the type and strength
grade of cement. Whether to add cellulose ethers depends on the specific needs.
b) Reference concrete mix proportion.
-- Cement. 250 kg/m³;
-- Fine aggregate for cement concrete. 750 kg/m³;
-- Coarse aggregate (5 mm ~ 10 mm) crushed stone for cement concrete. 1
000 kg/m3;
-- Water. 250 kg/m³.
This mix proportion is for reference only. The mix proportion shall be adjusted
according to the availability of raw materials. The 28-day permeability of the reference
mortar and reference concrete shall be 0.4+0.0 -0.1 MPa. The cement content in the reference
concrete mix proportion shall not be less than 250 kg/m3.
7.1.2.2 The water volume for all test items of cementitious capillary crystalline
waterproofing coating shall be the water volume recommended for actual use in the
project. The amount of waterproof coating used in the test coating shall be 1.5 kg/m2.
7.1.2.3 The mix proportion design and mixing method of the reference concrete for
preparing the test of cementitious capillary crystalline waterproofing admixture and the
tested cement concrete shall meet the requirements of GB 8076, except for the
impermeability performance. The dosage of waterproofing admixture shall be based on
the recommended dosage of each manufacturer. The preparation of the reference
concrete for impermeability can refer to the mix proportion in 7.1.2.1.The 28-day
permeability of the reference concrete shall be 0.4+0.0 -0.1 MPa, and the cement content in
the mix proportion shall not be less than 250 kg/m3.
7.1.3 Mortar or concrete mixing
Mix the mortar using a mixer for mixing mortars conforming to JC/T 681, and mix the
mortar according to GB/T 17671.When using a single-shaft forced mixer or other types
of forced mixers for concrete mixing, it is essential to ensure that the concrete is mixed
evenly, and the amount of concrete used in each mixing session is no less than 1/4 and
no more than 3/4 of the rated mixing capacity of the mixer. First add coarse and fine
aggregates such as sand and gravel, then add cement, mix well, and then add water and
mix again. The method of adding the waterproofing admixture can be recommended by
the manufacturer. Add the waterproofing admixture to cement or water and stir evenly
before sand and gravel are added and mixed. The total stirring time shall be 3 min ~ 5
min.
7.1.4 Preparation and curing of mortar and concrete test pieces
7.1.4.1 Preparation and curing of mortar test pieces
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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