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Water tank waterproofing | zero span tension elongation and adhesion strength criteria

Water tank waterproofing | The importance of balance of zero span tension elongation and adhesion strength criteria

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Water tank wateprooring | aquashutter

To maintain good waterproof function over long periord of time, waterproofing membrane should have both sufficient zero span tension elongation amount that can follow the cracks generated in the structure, and sufficient adhesion strength too.

 Waste water treatment structure such as a waste water storage tank in a sewage facility and a water storage for drinking water. Polymer for waterproofing material suitable for use in a structure that can store liquid in the container, such as a tank, a water receiving tank provided in the basement, a fire extinguishing water tank, etc.

If the structure is a concrete structure, and the structure is a concrete container that stores wastewater or drinking water for a long period of time, the function of the structure will be impaired if the stored liquid flows out of the container. Therefore, it is necessary to waterproof the surface of the structure having such a contact surface with the liquid.

Water storage tank has a longer period of contact with the liquid than the transport pipe of waste water or drinking water or the outer wall of the building, and is continuously in contact with the liquid, so that the waterproof material has particularly high waterproof performance and reliability.

Here, in order for the waterproof material applied to the structure made of concrete to have a high waterproof property, it has a sufficient zero span tension elongation amount that can follow the cracks generated in the structure, and also against the surface of the structure. It is desirable to have sufficient adhesion strength.

Furthermore, in a water tank that is exposed to liquid for a long period of time, it is also important to have a high tensile strength in order to maintain a waterproof function over a long period of time without breaking in a state of following a crack. However, the conventional acrylic polymer cement has a problem that it cannot be said that the tensile strength property is sufficiently high.

 Zero span tension elongation refers to a length that allows the waterproof material to follow a crack generated in a structure coated with the waterproof material without breaking. Concrete structures can crack when used for long periods of time. At this time, for example, when the structure is the container of the water storage tank, the liquid stored in the container flows out of the container when the waterproof material is stretched and cracked along with the crack of the container. If the value of the zero span tension elongation of the waterproof material is large, the waterproof material can be stretched following the cracked container without being broken, so that the liquid can be prevented from flowing out. Therefore, the magnitude of the zero span tension elongation amount of the waterproof material is closely related to the waterproof property of the waterproof material. Also, the measurement of the zero span tension elongation amount is performed by causing the base plate to crack in the state where the waterproof material to be measured is applied to the base plate, and is therefore suitable for the actual performance evaluation of the waterproof material.

The zero span tension elongation value has a strong correlation with the elongation rate of the waterproof material. That is, the greater the elongation rate, the larger the waterproof material can be stretched, and therefore it is possible to follow even large cracks. However, it is not sufficient to evaluate the magnitude of the zero span tension elongation amount only by the elongation rate, and it is also necessary to evaluate the tensile strength indicating the mechanical strength of the waterproof material. This is because by having a high tensile strength, the waterproof material is not broken even by a strong force generated when a crack is generated, and the stretched state can be maintained.

On the other hand, when the waterproof material keeps in contact with the liquid stored in the container for a long period of time, a part of the waterproof material is peeled off from the surface of the container and is likely to float or swell. When the waterproof material floats or bulges, the liquid stored in the container enters between the waterproof material and the container, which accelerates the penetration of the liquid into the concrete wall forming the container and the deterioration of the container. Furthermore, the liquid will flow out of the container. If the adhesion strength of the waterproof material is large, it is possible to suppress the occurrence of floating of the waterproof material, and thus it is possible to prevent liquid from leaching into the container and cracking due to deterioration of the container. Accordingly, the adhesion strength of the waterproof material is closely related to the waterproof property of the waterproof material with respect to the prevention of liquid outflow caused by the occurrence of floating and swelling of the waterproof material.

The conventional acrylic polymer cement is used as a waterproof material because of its high elongation and excellent flexibility. Here, in the waterproof material formed by the conventional acrylic polymer cement, the zero span tension elongation amount and the adhesion strength of the waterproof material can be changed by changing the blending ratio of the acrylic resin component weight contained in the acrylic resin emulsion to the cement weight. It was adjusted.

However, in the conventional acrylic polymer cement, when the blending ratio of the acrylic resin to the cement weight is increased, the zero span tension elongation amount of the waterproof material can be increased, but the adhesion strength is decreased. On the other hand, if the blending ratio of the acrylic resin emulsion to the cement weight is decreased, the adhesion strength of the waterproof material can be increased, but the zero span tension elongation amount is decreased. For this reason, it has been difficult to achieve both the zero span tension elongation and adhesion strength of conventional waterproofing materials.

 As mentioned above, the adhesion strength of waterproofing materials is also closely related to waterproofness, so finding the zero span tension elongation simply because the crack followability is high is at the expense of the adhesion strength. As a result, there was a problem that it was necessary to make difficult decisions on material design.

A waterproof material designed to have a balanced and high value for all of the zero span tension elongation amount, adhesion strength, and tensile strength, which are important characteristics as a waterproof material, and extremely waterproof to provide this. An excellent polymer cement composition for waterproofing material can be realized.

UBE has conquered the weather and fatigue resistance issues that were the drawbacks of previous polymer-modified cement waterproofing materials, and can now offer waterproofing performance over a long period of time. These next-generation waterproofing materials can meet the various needs for indoor waterproofing.


Lightweight panel jointing solution FX55

Lightweight wall system such as hollow core panel, ALC (autoclaved lightweight concrete) panel, cemboard, EPS was designed to provide the industry with a new perspective in building cost management, construction productivity and process efficiency. Besides, drywall materials like magnesium oxidide board, calcium silicate board, fiber cement board, gypsum board, plywood or oriented strand board are commonly used in the market as well. Our Rhinoz lightweight jointing solution shall be the key to improvement of efficiency and quality. Lets see how our FX55 hybrid jointing solution can prevent crack and seal lightweight panel joints.

Precast jointing solution RF134

The key to complete precast system Precast concrete is widely used due to its advantages, including storm and earthquake resistance, consistant quality control with international standards, the shorter the construction period, reduction of dependance on labor, and better cost control. Drawbacks of using precast concrete panels such as visible joints between precast panels, high movement, especially high rise structures, thermal movement that under tropical climate and large jointing gap caused by non-aligned precast concrete wall panels eventually can be overcome by our Rhinoz precast jointing solution RF134.  

2 criteria on selection of ALC panel joint sealant

ALC panel joint sealant
ALC panel joint sealant
Evaluation of Sealed Joint Performance for selection of ALC panel joint sealants (Autoclaved Lightweight Concrete Panels The strength of autoclaved lightweight concrete (ALC) is evidently lower than that of normal concrete. Therefore, when movement occurs at a sealed joint between ALC panels, the sealant is required to deform and remain intact without damaging the ALC substrate. However, there is currently not sufficient information to permit evaluation of the expected performance of sealants applied to ALC substrates.   In their study pushed on July 2012 Journal of ASTM International 9(1):104064, the researchers carried out static and dynamic tests in order to obtain an index that could be used to select the modulus of a sealant that can be expected to provide long-term performance when applied to an ALC substrate. To develop this index, an initial study was carried out in order to clarify actual joint movement between ALC panels of buildings; the expansion and contraction at the joint were measured, and shear joint movement was calculated based on the expected story-to-story drift of an external wall due to earthquake loads. Thereafter, in a subsequent stage of the study, five types of two-component polyurethane sealant products, of different elastic modulus, were subjected to tensile and shear tests from which the relationship between stress and the type of joint fracture was determined. The results from these tests revealed that when the stress is greater than 0.6 to 0.7 N/mm2, the ALC substrate is more easily fractured than the sealant. In a final stage of the study, the cyclic fatigue resistance of the same two-component sealants was evaluated using tensile and shear fatigue tests. Results from the fatigue tests indicated that the high modulus sealants lost adhesion from the ALC substrate at an early stage in the test. As well, the fatigue resistance of test specimens with joints having three-sided adhesion was lower than that of specimens having normally configured joints with adhesion on two sides of the sealant. Therefore, on the basis of results derived from all the studies, it was determined that a suitable sealant for use on ALC substrates is a sealant having a low modulus that is applied in the normal fashion as a two-sided joint. After decades of R&D, Kaneka Group in Japan invented MS sealant (Modified silicone sealant) AS4001S high performance sealant for construction joint and ALC panen joint with such outstanding features as:
  • ALC panel joint sealant
    ALC panel joint sealant
    Good Environmental Choice Australia (GECA) certified
  • ASTM C920 (Class 50) compliant
  • ISO 11600 (F Class 25 LM) compliant
  • Good UV resistance
  • Low static charge – Less dirt streaking
  • No silicone oil – Non-staining on adjacent substrates
  • No isocyanate – No air bubbling
  • No solvent – No shrinkage
  • Bonds most substrates without primer
see below for details: Learn more about high performance for precast joint here

2 tiêu chí lựa chọn keo trám khe nối tấm ALC

Keo trám khe nối tấm ALC
Keo trám khe nối tấm ALC

Đánh giá hiệu suất làm việc của khe nối trám keo để lựa chọn đúng keo trám khe nối tấm ALC

Sức bền của tấm bê tông khí chưng áp ALC (Autoclaved Lightweight Concrete – sau đây gọi tắt là tấm ALC) thấp hơn bê tông thông thường. Do đó, khi có biến động tại khe nối giữa các tấm ALC được trám keo đàn hồi, keo trám khe phải biến dạng, đồng thời vẫn bám dính tốt và không làm ảnh hưởng đến 2 mép tấm bê tông ALC. Tuy nhiên, hiện chưa có đủ thông tin để đánh giá hiệu suất làm việc của keo trám khe nối tấm ALC.   Trong bài nghiên cứu của mình đăng trên tạp chí Journal of ASTM International – tháng 7/2012, các nhà nghiên cứu tại đại học Chungnam National UniversityNational Research Council Canada đã tiến hành các thí nghiệm động và tĩnh để đưa ra 1 chỉ số làm cơ sở lựa chọn module đàn hồi của keo trám khe nhằm bảo đảm hiệu suất làm việc lâu dài của keo trám dùng cho khe nối tấm ALC. Để thiết lập được chỉ số này, các nhà nghiên cứu cố gắng hiểu biến động thực tế giữa các tấm ALC trong công trình; giãn nở và co ngót tại khe nối đã được đo và biến động của khe nối được tính toán dựa trên mức độ trượt dự kiến của tường ngoài giữa các tầng dưới tác động của tải trọng động đất.   Vì vậy, nhóm nghiên cứu đã sử dụng 5 loại keo trám khe gốc PU có độ co giãn đàn hồi khác nhau, được thí nghiệm với bài kiểm tra kháng xé và căng kéo khác nhau. Kết quả thí nghiệm cho thấy khi ứng suất lớn hơn 0.6-0.7N/mm2, mép tấm bê tông ALC dễ bị vỡ hơn keo trám khe.   Trong giai đoạn cuối của quá trình nghiên cứu, khả năng kháng mỏi theo chu kỳ của keo trám 2 thành phần được đánh giá dựa trên các thí nghiệm về khả năng kháng mỏi và căng kéo. Kết quả thí nghiệm khả năng kháng mỏi cho thấy các dòng keo trám khe đàn hồi có modul đàn hồi lớn bị mất bám dính với mép tấm ALC ngay trong giai đoạn đầu của thí nghiệm.   Khả năng kháng mỏi của các mẫu keo trám khe có bám dính 3 mặt thấp hơn khả năng kháng mỏi của các mẫu keo được trám cho khe nối được thiết kế chuẩn, chỉ bám dính 2 mặt. Các kết quả nghiên cứu chỉ ra rằng keo trám phù hợp cho khe nối ALC là keo trám có modul đàn hồi nhỏ và bám dính 2 mặt. Giải thích thêm: keo trám khe có module đàn hồi nhỏ và lớn được giải thích đơn giản là: modul đàn hồi nhỏ chỉ cần một lực nhỏ để có thể căng kéo mẫu keo và có độ đàn hồi tốt hơn, keo trám có modul đàn hồi lớn hơn sẽ cứng hơn khi đã lưu hóa. Xem thêm keo trám khe nối tấm ALC đàn hồi hiệu suất cao MS sealant AS4001S  Keo trám khe nối tấm ALC AS4001S được các chuyên gia khuyên dùng để trám trét các mối nối thi công như:
  • Keo trám khe noi tam ALC
    Keo trám khe noi tam ALC
    Khe co giãn
  • Mối nối thi công
  • Mối nối các tấm ốp tường, v.v.
  • Trám trét mối nối các tấm kim loại hoặc đá
  • Vành đai cửa/cửa sổ
  • Có thể sử dụng để trám khe các cấu kiện bằng sứ, kim loại mạ, tấm epoxy và polyester, polystyrene, uPVC, thép không gỉ, alu đã a-nốt hóa và gỗ hoàn thiện, trám khe nối, mối nối tấm bê tông cốt sợi thủy tinh GRC, tấm bê tông đúc sẵn acotec, ALC, EPS.
Sưu tập từ nguồn:  

Bolt and nut corrosion protection by Nitohullmac XG | How it works

Bolt and nut corrosion protection using Nitohullmac XG series
Bolt and nut corrosion protection using Nitohullmac XG series

Bolt and nut corrosion protection by Nitohullmac XG | How it works

| Functions Protect metal structures such as bolts, nuts, flanges, pole connector plates from corrosion. | Corrosion protection requirements
  • Encapsulation system that covers all bolts, nuts and flanges in one application and is maintenance free;
  • Sprayable organic coating system, polymeric resin based, providing protection for any metallic surface;
  • Remove easily (as it does not adhere to the substrate) without the need for special equipment and reusable (recyclable) ;
  • Its formula contains corrosion inhibitors that offer equipment maximum protection against contamination and corrosion. The polymeric resin surrounds the metal component providing a passive protection while allowing the oil based corrosion inhibitors to actively protect the substrate and arrest any existing or new corrosion by starving the process of oxygen and preventing moisture/ dust ingress
| Surface preparation
Tools for corrosion protection application
Tools for corrosion protection application
Minial surface prepration is required. | Ease of application Simple application, especially easy to apply on hard-to-reach areas, irregularly shaped items such as flanges, bolts, nuts, connectors etc. | Application procedures See here

LEED and low-VOC architectural sealant

| What is LEED?
Leadership in Energy and Environmental Design
LEED: Leadership in Energy and Environmental Design
LEED (Leadership in Energy and Environmental Design) is an internationally recognized green building certification system, providing third-party verification that a building or community was designed and built using strategies aimed at improving performance across all the metrics that matter most: energy savings, water efficiency, CO2 emissions reduction, improved indoor environmental quality, and stewardship of resources and sensitivity to their impacts. Developed by the U.S. Green Building Council (USGBC), LEED provides building owners and operators a concise framework for identifying and implementing practical and measurable green building design, construction, operations and maintenance solutions. LEED provides a point system to score green building design and construction. The system is categorized in five basic areas:
  • Sustainable Sites;
  • Water Efficiency;
  • Energy and Atmosphere;
  • Materials and Resources; and
  • Indoor Environmental Quality.
Buildings are awarded points based on the extent various sustainable strategies are achieved. The more points awarded the higher the level of certification achieved from Certified, Silver, Gold, to Platinum. LEED provides a sustainability framework for design, construction, operations, and maintenance of new and existing buildings. AS-4005 is able to meet the low-VOC architectural sealant requirement. With the low VOC feature, the use of AS-4005 could contribute to Leadership in Energy and Environmental Design (LEED) credits under the IEQc4.1: Low-Emitting Materials – Adhesives and Sealants credit category. The white colour of AS-4005 meets the requirements of CSM (Cleanroom Suitable Materials) standard, hence it is recommended for applications in electronics cleanrooms. Click here for more details. by VTS team

Automotive painting masking tape | 5 criteria on masking tape selection

Automotive painting masking tape| 5 selection criteria : heat resistant, easy to remove leaving adhesive residue, easy to tear, conformability to curved lines, compatible with the most common paints.

automotive painting masking tape NO.7288
Automotive painting masking tape No.7288
In automotive repair or painting, it is required to cover and protect those parts of the vehicle which are not to be worked on to protect them from unwanted damage, soiling or paint overspray. A good preparation using automotive painting masking tape from the very beginning reduces or even eliminates any unnecessary clean-up or rectification afterwards.

Time consuming masking activities can be minimised by using high quality material and good application techniques and it is always worth investing into premium masking tapes, which can be effortlessly removed without slithering, slicing or leaving adhesive residue.

But how can you recognize the best masking tape for automotive painting? Below are key criteria: heat resistance, easy hand-tearibility, leave no residue, bonding to various substrates, compatible with various common types of paint. 5 key features that distinguish the best automotive painting masking tape from all other standard tapes:
  1. Heat resistance
  2. Easy to remove
  3. Easy to tear
  4. Conformability to curves
  5. Compatibility to a wide range of paints.
# 1. Heat resistance Automotive painting masking tape must be heat resistant, which means it must be able to withstand the high temperatures in the paiting booth to assure that it must not come off, fall, slide along the surface of the body, crumble or have other behaviors that could ruin the result of painting. # 2. Easy to remove It is very important that the masking tape, once removed, leaves no traces of glue on the shock. In the same way, it is essential that when you remove it, you do not take off any parts of the bodywork paint, and that the edges result clean and clean. # 3. Easy to tear by hand
automotive painting masking tape NO.7288
Masking tape No.7288 – easy to tear by hand
During a painting and finishing of the body work, having to cut the masking tape with scissors slows down the pace of work, it is dangerous and uncomfortable too. That’s why the best automotive painting masking tape can easily be broken with your hands, even into very small pieces       # 4. Conformability to curves
automotive painting masking tape NO.7288
No.7288 Masking tape: adapt to any curves and edges
The lines that define the shapes of the bodywork are only in very small part straight lines: mostly, automotive painting is about turning around curved lines. As a result, it is of fundamental importance that the automotive painting masking tape is easy to lay down even where it has to follow curved trajectories. # 5. Compatibility to various paints Finally, the best automotive painting masking tape is the one that fits without any problem to all types of most common paints, primers and fillers. This means that the adhesion is always impeccable – even when using water-based paints – and that the shape and characteristics of the tape do not change during the application of the paint, but always remain at their top. |Read more: Nitto Masking tape No.7288 | 3 reasons to use masking tape Always one step ahead in making good things happen with its masking tape, Nitto Denko from Japan, one of the largest and most experienced manufacturers of adhesive tapes in the world authorized Vina Trade Synergy as official distributor of automotive painting masking tape No.7288 in Vietnam.
automotive painting masking tape No.7288
Car paint tape Nitto No.7288
|Technical specifications:
Property Unit No.7288
Thickness [mm] 0.09
180˚ Adhesive strength [N/18mm] 3.94
Tensile strength 54.0
Elongation [%] 5.6
Should you have other specific requirements, please dont hesitate to let know. We can work closely with the manufacturer to bring you the product that best fits your purpose. You can contact us here for 24/7 free support.

Masking tape No.7288 | 3 reasons why masking tape is an indispensable part in painting and sealant work


  1. Protect areas not designed to be painted or sealed
  2. Facilitate tooling and correction of any sealant or paint defects without damaging adjacent areas
  3. To creat a perfect razor sharp line of paint or sealant

See HERE for details.

Nitto Denko| A comprehensive anticorrosion solution for underground and outdoor steel structures

corrosion prevention 1Developed and applied by over 100 year-old Nitto Denko Group for Kobe steel factory in Japan for the first time in 1985, the “Made in Japan” Nitto Denko anticorrosion tapes have been used successfully across the world as a comprehensive corrosion prevention solution for pipelines, pipeline components (such complicated shape components as fittings and flange connections, U-bolt etc) and metal structures such as poles, bolts, nuts, valves, flanges etc both aboveground, outdoor and underground, in seawater environments. Now available and exclusively distributed in Vietnam by Vina Trade Synergy, serving the mission of protecting metal structures in factories, outdoor, underground and under seawater from severe corrosion, a must-have sustainable solution for factory and property owners/managers/operators. Specifically, lets see how it applies to telecom tower corrosion protection.  

  • Add/showroom: BT7-16, KĐT Văn Khê, Hà Đông, Hà Nội
    Inquiry: 038.224.1661
    Product consultation: 0789.000.134

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