DECISION OF THE MINISTER OF CONSTRUCTION

Regarding the issuance of the Vietnamese Construction Standard Male TCXD VN 316: 2004

"Lightweight Concrete Block - Technical Requirements"

 

THE MINISTER OF CONSTRUCTION

On the basis of Decree No. 36/2003/NĐ-CP dated April 4, 2003 of the Government stipulating the functions, tasks, powers, and organizational structure of the Ministry of Construction;

Based on the minutes of the meeting 21/05/2004 of the Professional Science and Technology Council to approve the standard "Lightweight Concrete Block - Technical Requirements";

Considering the proposal of the Director of the Institute of Building Materials at Circular No. 448/VLXD-KHKT dated May 31, 2004, and that of the Director of the Department of Science and Technology;

 

DECISION:

Article 1: Issuing along with this Decision is one Vietnamese Construction Standard TCXD VN 316: 2004 "Lightweight Concrete Block - Technical Requirements".

Article 2: This Decision shall take effect fifteen days from the date of publication in the Official Gazette.

Article 3: The Heads of the Ministry's Office, the Department of Science and Technology, the Director of the Institute of Building Materials, and the Heads of related units are responsible for implementing this Decision./.

 

 

Lightweight Concrete Block - Technical Requirements

Blocks of lightweight concrete – Specifications

 

1 Scope

 

This standard applies to lightweight concrete blocks manufactured from cement, fine aggregates, foaming agents or gas-forming materials for load-bearing structures, thermal insulation structures, and thermal insulation in construction projects.

           

2 Referenced Documents

 

TCXDVN…:2004 – Lightweight Concrete Block – Testing Methods

 

3 General Provisions

 

Lightweight concrete blocks according to this standard are products in block form with dry bulk density ranging from 400 to 1200 kg/m³.³.

Foaming agents are surface-active substances that form stable foam when strongly dispersed in water.

Gas-forming agents are metal powders (Al, Zn, etc.) capable of reacting with Ca(OH)₂₂ to produce hydrogen (H₂₂) or other gases.

 

4 Classification, Basic Dimensions, and Conventional Symbols

 

4.1 According to dry bulk density, lightweight concrete blocks are classified into the following grades:

 

D400, D500, D600, D700, D800, D900, D1000, D1100, D1200

 

4.2 According to compressive strength at 28 days converted to standard moisture content of 10%, lightweight concrete blocks are classified into the following grades:

 

M10, M15, M20, M25, M30, M35, M50, M75, M100

 

4.3 According to dimensions, the basic dimensions of lightweight concrete blocks are specified in Table 1

 

Table 1 - Basic Dimensions

Unit of measurement: millimeters

 

 

 

Note: Lightweight blocks of different sizes than those listed in Table 1 may be produced.

 

4.4 The conventional symbol for lightweight concrete blocks is recorded in the following order:

 

BLB-700/25 TCXDVN…:2004

 

Where:

BLB: Lightweight concrete foam block (if it is a lightweight concrete air block - BLK)

700: Dry bulk density

25: Compressive strength grade of the product

TCXDVN …2004: Standard number and year of issuance.

 

5 Technical Requirements

 

5.1 Dimensional deviations of the blocks shall not exceed the following limits:

 

Length (l): ± 4mm

Width (b): ± 3mm

Height (h): ± 3mm

 

5.2 Defects in shape of the blocks shall not exceed the limits set out in Table 2

 

Table 2 - Shape Defects

 

 

 

 

5.3 Dry bulk density grades are specified in Table 3

 

Table 3 - Dry Bulk Density Grades

 

 

 

 

 

Table 4 - Compressive Strength Grades

Compressive strength at 28 days, N/mm²

 

 

 

Dry bulk density grade

 

Compressive strength grade, not less than

 

 

 

 

7 Labeling, Storage, and Transportation

7.1 Lightweight concrete blocks are delivered in lots, each lot consisting of products of the same size and grade. The typical lot size does not exceed 5,000 pieces.

7.2 Upon shipment, there must be a test certificate for the lot indicating compliance with the requirements of this standard, including the following information:

 

Name and address of the production facility

  

Date of manufacture

Lot number

Quality indicators according to this standard

Conventional symbol of the product

7.3 Products should be neatly stacked on specialized pallets. The height of each stack should not exceed 1.5 meters. Pallets of products need to be covered to protect against water.

7.4 Products can be transported by any means and must be carefully covered and cushioned to prevent damage to corners and edges./.

 

7.3 Products shall be neatly stacked in专用的托盘上。每堆的高度不得超过1.5米。产品托盘需要覆盖防水。

 

7.4 Products shall be transported by all means of transport and properly covered and secured to prevent damage to corners and edges./.