IRC 42 (1972) provides standardized proforma templates for systematically recording test values of locally available pavement construction materials such as hard aggregates, low-grade aggregates, and soil-gravel mixtures. Intended primarily for design engineers and survey teams, this standard facilitates the evaluation and optimal utilization of indigenous materials in road construction projects, aiding in material selection and cost estimation before finalizing specifications.
Overview
IRC 42 (1972) provides standardized proforma templates for systematically recording test values of locally available pavement construction materials such as hard aggregates, low-grade aggregates, and soil-gravel mixtures. Intended primarily for design engineers and survey teams, this standard facilitates the evaluation and optimal utilization of indigenous materials in road construction projects, aiding in material selection and cost estimation before finalizing specifications.
Audience
Contents
Structure
IRC 42 introduces standard Proforma designed to assist design engineers in evaluating locally available pavement materials and preparing realistic cost estimates. There are three Proforma types: I for hard aggregates, II for low-grade/soft aggregates, and III for naturally occurring soil-gravel/moorum mixtures, as per Clause 2.1. These Proforma were developed by the Soil Engineering Committee and approved through a series of committee meetings culminating in 1972 (Clause 1.2). The Proforma help record test values and relevant particulars of pavement construction materials, aligning with commonly used specifications (Clause 3.1). No specific formulas or tables are provided in the introduction, but the focus is on standardized data recording for material evaluation.
Sources: Clause 1.2, Clause 2.1, Clause 3.1
The scope and application of IRC 42 focus on providing standardized Proforma to assist design engineers in evaluating locally available pavement construction materials and framing realistic cost estimates, primarily at the pre-specifications stage (Clause 1.3, 3.1). These Proforma are not intended for quality control during construction but serve as guidance for survey and design staff. The Proforma include detailed record formats for test values of hard aggregates, low-grade/soft aggregates, and naturally occurring soil-gravel/moorum mixtures, referencing relevant Indian Standards (IS) and IRC specifications for uniformity in testing (Clause 4.2). Key specifications include aggregate impact value, Los Angeles abrasion value, specific gravity, water absorption, flakiness index, stripping value (for bituminous constructions), gradation, optimum moisture content, Proctor density, Atterberg limits, and CBR values. These are tabulated in the Proforma to ensure systematic evaluation and documentation of material properties.
Sources: Clause 1.2, Clause 1.3, Clause 3.1, Clause 4.2
The Proforma in IRC 42 are designed to assist design engineers in evaluating locally available pavement materials and framing cost estimates, focusing on typical specifications (Clause 3.1). There are three Proforma types:
Proforma I: For hard aggregates, recording test values such as Aggregate Impact Value, Los Angeles Abrasion, Specific Gravity, Water Absorption, Flakiness Index, Stripping Value (for bituminous use), Bulk Density, Sulphur Content, and Chemical Stability (Clause 2.1).
Proforma II: For low-grade/soft aggregates, including tests like Aggregate Impact Value, Water Absorption (dry and wet), Chemical and Soundness tests, with remarks on performance (Clause 2.1).
Proforma III: For naturally occurring soil-gravel/moorum mixtures, recording gradation (IS: 2720-Part IV), Optimum Moisture Content, Proctor Density, Atterberg Limits (IS: 2720-Part V), and CBR values (Clause 2.1).
Notes:
Tables for each Proforma include columns for location, sample/test numbers, test results, and remarks on performance and quarry details.
This structured approach ensures systematic evaluation of materials for pavement courses and cost estimation.
Sources: Clause 1.3, Clause 2.1, Clause 3.1, Clause 4.2
IRC 42 specifies detailed sampling and testing procedures for pavement construction materials, referencing Indian Standards for uniformity (Clause 4.2). Key points include:
Samples must be prepared at maximum dry density and optimum moisture content per IS: 2720-Part VI and tested as per IS: 2720-Part XVI, with soaking for 4 days unless otherwise specified (Clause 4.75 notes).
Testing proformas are provided for hard aggregates, low-grade/soft aggregates, and naturally occurring soil-gravel/moorum mixtures, capturing parameters such as Aggregate Impact Value (IS: 2386-Part IV/V), Los Angeles Abrasion (IS: 2386-Part IV), Specific Gravity, Water Absorption, Flakiness Index, Stripping Value (IRC method), Bulk Density, Sulphur Content (BS 1047), Chemical Stability (BS 1047), Atterberg Limits (IS: 2720-Part V), CBR values, and gradation (IS: 2720-Part VII).
Sieves conform to IS: 460.
A set of three specimens should be tested from each sample for reliability.
These proformas ensure systematic evaluation of material performance in sub-base, base, and wearing courses, including remarks on quarry conditions and material suitability for bituminous construction.
This structured approach ensures consistency and reliability in material quality assessment for pavement design and construction.
Sources: Clause 3.2, Clause 4.2, Clause 4.75
Detailed content not available.
The Proforma II for record of test values of low-grade/soft aggregates as per IRC 42 includes the following key parameters and test references:
This proforma ensures uniformity by referencing Indian Standards such as IS: 2386 (various parts) and IS: 5640 for wet impact tests. The dry and wet aggregate impact values assess toughness and durability, water absorption indicates porosity, and chemical/soundness tests evaluate stability.
The table format is as follows:
| LOCATION AND NAME OF QUARRY | DESCRIPTION | SAMPLE NO. | TEST NO. | AGGREGATE IMPACT VALUE (Dry) | AGGREGATE IMPACT VALUE (Wet) | WATER ABSORPTION | CHEMICAL TESTS | SOUNDNESS TEST | REMARKS | ADDITIONAL REMARKS | |---|---|---|---|---|---|---|---|---|---|
This proforma is designed for low-grade/soft aggregates used in pavement construction to record essential test values systematically.
Sources: Clause 2.1, Clause 4.2, Proforma for Record of Test Values of Low-Grade/Soft Aggregates
Proforma III for Naturally Occurring Soil-Gravel/Moorum Mixtures records key test values as per IRC 42, Clause 2.1 and Clause 4.75. It includes:
The proforma ensures uniformity referencing Indian Standards IS: 2720 series and IS: 460 for sieves (Clause 4.2). This structured record aids evaluation of soil-gravel/moorum suitability for pavement construction.
Sources: Clause 2.1, Clause 4.2, Clause 4.75
Detailed content not available.
IRC 42 provides detailed proformas and specifications for evaluating locally available materials for pavement construction, aiding design engineers in material assessment and cost estimation (Clause 3.1). Key test parameters and standards referenced include:
Hard Aggregates:
Low-grade/Soft Aggregates:
Soil-Gravel/Moorum Mixtures:
All tests are to be conducted per relevant IS standards (e.g., IS: 2720 series) with samples prepared at maximum dry density and optimum moisture content, soaked for 4 days unless specified otherwise (Clause 4.75). Indian Standard sieves conforming to IS: 460 are used for gradation.
These proformas include columns for quarry location, petrographic description, test results, performance remarks, and additional quarry information to systematically evaluate material suitability for sub-base, base, and wearing courses.
This structured approach ensures uniformity and reliability in material evaluation for pavement design and construction.
Sources: Clause 3.1, Clause 4.75, Clause 4.2
IRC 42 provides detailed Proformas for recording test values of quarry materials to ensure uniformity and suitability for pavement construction. Key specifications include:
Proforma I: For hard aggregates, recording parameters such as Aggregate Impact Value (IS:2386-Part IV), Los Angeles Abrasion Value (IS:2386-Part IV), Specific Gravity (IS:2386-Part III), Water Absorption (IS:2386-Part III), Flakiness Index (IS:2386-Part I), Stripping Value (IRC:14), Bulk Density (IS:2386-Part II), Sulphur Content (BS 1047), and Chemical Stability (BS 1047).
Proforma II: For low-grade/soft aggregates like laterite, kankar, including Aggregate Impact Value, Water Absorption, Chemical and Soundness Tests.
Proforma III: For naturally occurring soil-gravel/moorum mixtures, including Gradation (IS:2720-Part IV), Optimum Moisture Content, Proctor Density, Atterberg Limits (IS:2720-Part V), and CBR values (IS:2720-Part XVI).
Additional remarks on quarry conditions such as new/old quarry status, approximate quantity, and access are recorded to assess material availability.
These Proformas ensure systematic evaluation of materials per relevant IS standards for quality and performance in pavement layers (Clause 4.2, 2.1).
Sources: Clause 4.2, Clause 2.1
Frequently Asked
IRC 42 covers locally available pavement construction materials including hard aggregates (road stones), slag, low-grade or soft aggregates, and naturally occurring soil-gravel or moorum mixtures. These materials are systematically surveyed, sampled, and tested using three separate proformas: Proforma I for hard aggregates, Proforma II for low-grade/soft aggregates, and Proforma III for soil-gravel/moorum mixtures, as per Clause 2.1. This classification helps in optimal utilization and cost-effective road construction.
Sources: Clause 1.1, Clause 2.1
According to IRC 42 Clause 4.1, before extracting samples, the material source should be carefully examined and subdivided into groups based on material variability to ensure representative sampling from each group. For each class of material, three specimens should be taken from each sample, preferably by the quartering method, and tested accordingly. This ensures uniformity and representativeness in testing. Additionally, Clause 4.2 emphasizes that testing should follow relevant Indian Standards or IRC methods to maintain consistency. The proforma provided in Clause 4.75 guides recording test values for various materials, ensuring systematic evaluation.
Sources: Clause 4.1, Clause 4.2, Clause 4.75
Detailed answer not available.
The proforma for soil-gravel and moorum mixtures (Proforma III) addresses testing by recording detailed properties including general material description, gradation per IS: 2720-Part IV (percent passing through standard sieves 90 mm to 75 micron), optimum moisture content, Proctor density (IS: 2720-Part VI), Atterberg limits (IS: 2720-Part V), and CBR values tested as per IS: 2720-Part XVI. Samples are prepared at maximum dry density and optimum moisture content, soaked for 4 days before testing, with three specimens tested per sample. This comprehensive data aids design engineers in evaluating suitability for pavement courses and cost estimation, ensuring uniformity by referencing relevant IS standards (Clause 2.1, 3.1, 4.2, and Table 4.75).
Sources: Clause 2.1, Clause 3.1, Clause 4.2, Table 4.75
IRC 42 references several Indian Standards for conducting tests on pavement construction materials to ensure uniformity, as per Clause 4.2. Key IS codes include:
Additionally, some chemical and stability tests refer to British Standards (BS 1047) and IRC 14 for stripping value tests on slag aggregates.
Thus, IRC 42 integrates these IS codes as the primary references for testing procedures.
Sources: Clause 4.2, Clause 4.75
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