Concrete Block

A concrete block is sometimes known as concrete masonry unit (CMU), they can be solid or hollow and is available in many shapes and sizes. Concrete Blocks are used for engineering and architectural purposes.

Engineering usage of Concrete Block

Zenbes blocks can be constructed as a Load-bearing Wall or Infill Wall.

1) Load-bearing Wall 

Zenbes CMU is designed to be a high quality alternative to conventional structure by replacing cast in-situ reinforced concrete structure. Columns, Beams and Lintels are constructed using Concrete Masonry Units (CMU). Loadbearing wall, wall primarily designed to carry an imposed vertical load in addition to its own weight.

Some  advantages of a CMU Load Bearing Wall:-

  • CMU Full Block & Bond Beam when reinforced and infilled with concrete, becomes a stiffener & bond beam to replace conventional column, beam & lintel. It also act as a permanent formwork thus eliminating form-work/carpentry costs. An entire building can be built using this system.

2) As Infill Wall (Between Column & Beam)

Zenbes CMU are also widely used to replace clay bricks in between conventional RC and Steel frame structure.

Some advantages of a CMU Infill Wall:-

  • Less wet trades in construction site; cleaner site environment.
  • Easily accessible to any corner in the construction site.
  • Industrialized building system; faster installation period.
  • Less cleaning & surface maintenance after installation.
  • Only semi-skilled workers are needed for installation.
  • Retains colour brilliance despite constant exposure to outdoor elements.
  • High compressive strength minimizes severe damage by rough handling on site, hence reducing waste.
  • Durable; no corrosion or distortion after long period.
  • Dimensionally precise & consistent; this uniformity makes block-laying much easier and faster.
  • Less mortar joints between blocks.
  • Lighter weight (20-30% than bricks) means less dead load per square meter.
  • Surface area per piece is equivalent to about 5 times of normal bricks thus enabling faster laying work.
  • Larger & level surface area allows for a straighter wall with minimal skim coat, plastering & direct paint-on.
  • Fair-face (bare) wall can achieve 2-hours fire rating without plastering, skimcoat or infill.

Advantages of Zenbes CMU

For more than a quarter century, Zenbes has manufactured concrete products of a very high quality for the construction industry. Specifically, our Concrete Masonry Units (CMU), or commonly referred to as Concrete Blocks are produced under very stringent requirements in compliance to SIRIM Product Certification processes, IBS Status Certification by CIDB and Fire Resistance rating approved by Bomba, Malaysia.

In order to maintain and enhance customer confidence, our products have to meet high consistency and quality standards. We are fully committed to ensure that our production processes satisfy all quality requirements under ISO 9001- Quality Management System.

1) Cost-effective & Time-saving

Zenbes CMU is designed to be a high quality alternative to conventional construction methods by replacing common bricks & cast in-situ reinforced concrete structure. In most circumstances, CMU construction is faster and cheaper compared to conventional construction while the material properties are equal, if not better than bricks.

2) Structural Strength

Strict adherence to approved manufacturing processes at our block plant housing Besser machines from U.S.A. produces high quality and high-strength CMU compliant to BS EN 771-3: 2011.

3) Fire Resistance

Zenbes CMU offers excellent fire resistance. They are incombustible, rarely damaged by fire, do not buckle like steel, do not spall like reinforced concrete and do not burn like timber. There are tested in accordance to BS 476: Part 22 : 1987 & ASTM Standard E2226-10 and is approved by Bomba for Malaysia and SCDF – BCA for Singapore.

4) Thermal Comfort

The presence of dead air trapped in the cavities of CMU provides natural thermal insulation. ln hot tropical climatic temperatures, the interior of a CMU constructed building is cooler and more comfortable compared to a conventional brick building.

5) Noise Resistance

Due to the air cavities and high concrete density, CMU will offer effective noise insulation against medium to high range frequencies, this will result in a quiet and peaceful working/living environment.

6) Low Water Absorption

Our advanced manufacturing process creates concrete blocks with low permeability in order to minimize water penetration. Our special low moisture batching control also reduces the rate of drying shrinkage.

7) Eco-friendly

We are aware of the need to be environmentally conscious, thus the compliance to international green standards. We are continuously seeking to balance our aim of increasing productivity without forsaking our intention of being environmentally conscious e.g. increasing our recycle waste percentage in our raw materials consumption. We are accredited under ISO 14001: Environmental Management System & Singapore Green Label.

8) IBS Accreditation by CIDB

Zenbes CMU is a tested and proven IBS System and we are rated as aCategory A IBS manufacturer. Our CMU have achieved a range of scoring points in the structural, wall and components for simplified construction solutions as defined by CIDB. Load bearing blockwork system can score up to 0.8 IBS factor for structural component, 0.5 factor in the wall category and an additional 8 points in the components for simplified construction solutions.

Specifications

1) SIRIM Product Certification License

  • Zenbes Concrete Masonry Units are certified by SIRIM QAS, complying to BS 476 part 22, 1987 & BS EN 771-3 : 2011

2) Bomba Fire Approval Certificate & SIRIM Test Report

  • Test complying to BS 476 part 22, 1987 & BS 6073 : Part 1 : 1981
  • Fire Rating :1-4 Hours

Series Rating (Hours) Hose Stream Test Remarks
S10.01
(90mm thk.)
1 Pass 12mm thk. Plaster on Both Sides
S12.01
(114mm thk.)
1 Pass No Plaster/Infill
S15.01
(140mm thk.)
2 Pass No Plaster/Infill
S20.01
(190mm thk.)
2 Pass No Plaster/Infill
S20.01
(190mm thk.)
4 Pass Infill

3) Dimension and Tolerance, Compressive Strength & Water Absorption

  • Test complying to BS EN 771-3 : 2011
  • Dimensional Tolerance : [Length +3mm  -5mm], [Height – +3mm  -5mm], [Width – +-2mm] (Average +-4mm at any individual point)
  • Compressive Strength :Minimum 10N/mm² (1450psi) manufacturally guaranteed.
  • Water Absorption by Capillarity Mean :Mean Water Absorption for CMU ranges from 14.8g/m² to 18.0g/m²s
Series Length Width Height
S10.01
(90mm thk.)
390 91 190
S12.01
(114mm thk.)
391 115 188
S15.01
(140mm thk.)
389 139 190
S20.01
(190mm thk.)
388 190 190

Series Compressive Strength Mean Water Absorption by Capillarity Mean
S10.01
(90mm thk.)
19.2 N/mm² 19.2 g/m²s
S12.01
(114mm thk.)
12.7 N/mm²  16.6 g/m²s
S15.01
(140mm thk.)
16.2 N/mm²  17.06 g/m²s
S20.01
(190mm thk.) (2hrs)
13.9 N/mm²  15.6 g/m²s
S20.01
(190mm thk.)  (4hrs)
13.4 N/mm²  14.8 g/m²s

4) Moisture Movement – Moisture Expansion, Drying Shrinkage 

  • Test complying to BS EN 771-14 : 2002.

Series Moisture Expansion Mean Drying Shrinkage
S10.01
(90mm thk.)
0.10 mm/m 0.11 mm/m
S12.01
(114mm thk.)
0.73 mm/m 0.24 mm/m
S15.01
(140mm thk.)
0.24 mm/m 0.71 mm/m
S20.01
(190mm thk.)
0.12 mm/m 0.15 mm/m
S20.01
(190mm thk.)
0.15 mm/m 0.14 mm/m

5) Thermal Insulation

  • Test complying to ISO 8990 : 1994 (SIRIM)

Series R-Value K-Value U-Value
S10.01
(90mm thk.)
0.28 m²K/W 0.51 W/mK 3.56 W/m²K
S12.01
(114mm thk.)
0.28 m²K/W 0.67 W/mK 3.54 W/m²K
S15.01
(140mm thk.)
0.31 m²K/W 0.73 W/mK 3.28 W/m²K
S20.01
(190mm thk.)
0.32 m²K/W 0.68 W/mK 3.13 W/m²K

6) Noise Insulation & Absorption

  • Test complying to ISO 140-3 : 1994 (SIRIM)
Series STC (Rw) – No Plastering  STC (Rw) – With 12mm Plastering
S10.01
(90mm thk.)
44 48
S12.01
(114mm thk.)
46 50
S15.01
(140mm thk.)
48 51
S20.01
(190mm thk.)
49 53
S20.01H
(190mm thk.)
53 54 (5mm Skimcoat)
S15 Acoustic Block
(140mm thk.)
48

7) Wall Anchor Pull-out Test

  • Tested up to 9.0kN ultimate loading before failure. See “Pull-out test report” for more details.

8) Modular Co-ordination Certificate

  • Test complying to MS 1064-8 : 2001

9) Lead Equivalent Test

  • Americum-241 is used as radiation source and radiation is detected by GM Counter/Survey Meter

10) IBS Status Company certified by CIDB

  • Category A as complying CIDB Assessment of IBS Status Manufacturer (AIS)

11) ISO 9001 Quality Management System Compliance

  • Test complying with ISO 9001:2008

12) ISO 14001 Environmental Management System 

  • As complying with ISO 14001:2015

13) Singapore Green Label

  • As complying with Singapore Environmental Council’s requirement.

14) Singapore Fire & Other Reports

  • Contact:-
  • Singapore : All-Well Trading & Transportation Pte Ltd (+65 6368 0311)
  • Malaysia : Zenbes Sdn Bhd (+03 2273 4988)

(All Test Reports are available upon request.)

Zenbes Product Catalogue 2018

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Standard Concrete Masonry Unit

Architectural Block

Acoustic Block

Polished Block

Ventilation Block

Customized Block

Fitting Block

Unsplit Block

Technical Drawings

Typical Connection Details

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Opening, Bonding, Finishing Details

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Junction Connection Details

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Conduit Placement Details

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Roof Connection Details

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Videos

First Layer Guide

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Block Laying Guide

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Block Cutting Guide

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Frequently Asked Questions

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