2019年2月23日 · If the water absorption of the aggregates determined as per IS: 2386(part-3) is greater than 2 %, the aggregates shall be tested for wet aggregate impact value (AIV) (IS: 5640). Soft aggregates like kankar, brick ballast and laterite shall also be tested for wet AIV.

2020年5月7日 · In this article we shall discuss three important points about granular sub base (GSB) 1- How can we calculate the required GSB quantity? 2 - What is value of compaction factor for GSB? 3- How much loose thickness of GSB should be taken to …

GSB MORTH (Fifth Revision)-Part-1 - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document describes specifications for granular sub-base materials and construction. It defines the materials that can be used, including natural sand, crushed gravel, crushed stone, and crushed slag.

Scope: This Part of BS 812 describes methods for the determination of the aggregate impact value (AIV) which gives a relative measure of the resistance of an aggregate to sudden shock or impact. Principle A test specimen is compacted, in a standardized manner, into an open steel cup.

GSB and WMM Road Construction Materials: Granular Sub Base(GSB) is road construction materials. It is known as subbase, which is the layer of aggregate material placed on the subgrade, on which the WMM layer as a base course is found.

2020年8月15日 · The article emphasizes the importance of proper preparation of the subgrade, including the removal of vegetation and other extraneous matter, and the rolling with a smooth wheeled roller. The article also highlights the importance of volumetric mixing of the materials and the necessity of preparing a stock of graded GSB material before testing.

The Aggregate Impact Value Test is important because it helps to determine the quality and suitability of aggregates for use in road construction. Aggregates that have a low AIV value are generally considered to be more suitable for use in road construction, as they are able to withstand the impact and abrasion caused by vehicles.

A sieve analysis (or gradation test) is a practice or procedure used to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction of the whole mass.

For proper drainage, granular sub base (GSB) layer should have sufficient permeability which allows the flow of water through it. There are six grading of GSB that have been recommended by MORTH specifications[1]. In this paper results of a laboratory study conducted on GSB Grade-1 material are given.

2023年12月3日 · What do the AIV values mean? Here are the recommended Aggregate Impact Test values and their corresponding classifications: Aggregate Impact Value Classification. Less than 20%: Exceptionally strong. Between 10% and 20%: Strong. Between 20% and 30%: Satisfactory for road surfacing. More than 35%: Weak for road surfacing