That is a tough question!

I guess the best option is to compare both with experimental results.

It depends on type of construction or product. For products based on research back up , it is possible that most of the standards ( from more than two countries) may be more or less similar. For example Verification of compressive strength of concrete may be based on cube strength or cylindrical compressive strength in some countries. The Cylindrical compressive strength of concrete is approximately 0.85 times cube compressive strength of concrete at 28 days curing period.

To compare two construction products standards it is essential to know research back up regarding performance of the given products. Please specify the construction product.

as per my perception product should have same quality through out world

but this is ideal condtion.

to check ,

let me take our example,

if we have brick from different company,strength may be check by droping brick on other brick from 1.25 m height,if break then its strength not good,if remain as it is it has good strength

likewise other properties can also be check

An instrument that can be used in this sense is the concept of functional units, recommended by ISO 14040, it regulates internationally the environmental assessment and life cycle of products. Functional units, if well designed, can help to determine advantages and disadvantages of construction solutions by comparison. To guarantee the approvability of the design ISO 14040 requires that equal conditions in relation to all aspects of concern that may have an impact on the scientific comparison must be create for functional units .

The functionality of the units must be evaluated in the sense that products to compare should perform the same function at the same extent and operate under the same physical and environmental conditions.

An example is given to clarify the concept of functional units. Two cans of one liter white wall paint of the brands A and B are to be compared regarding their prices. Brand B is 10% more expensive than brand A. To compare scientifically the prices it is evident that the direct comparison is not conclusive because the outcome is not known. Both brands indicate that one liter serves for 10 m2 of painting. Therefore, two walls with a surface of 10 m2 each are chosen. These two walls must be totally equal, built of the same materials and be at the same place under the same conditions, exposed to the same environmental conditions like temperature, humidity and light. These walls can now under these circumstances be considered as functional units and the wall paints can be applied. After drying the two wall paints can be compared regarding resistance, durability, touch, color and what ever is of interest to define the relation of price and quality.

Sorry for the long answer, your question of the method of scientific comparison of construction materials or solutions is very important and of great interest.

Expert Choices Methods. You are free to choice unlimited number of criteria. National and International standards of specific materials and, advantages and disadvantage in terms of local/cheapest materials. It is like game, choosing within range of demanded quality criteria. So. it could be: Matrix Analysis, Analytic Hierarchy Process, Decision Trees, etc.

Ask the people using the product. As an example, with paint normally the price is a function of % of pigment, all other things equal. With rebar, % of carbon, chemical make up. Users with problems can normally be found on the comments on the product category. Experts? not many on new items.