The specification defines the criteria for burnt clay soling bricks chiefly employed as a base layer in road construction across India. It details the required dimensions, physical characteristics such as compressive strength and water absorption, quality benchmarks, sampling methods, and marking protocols to guarantee uniformity in production and performance. This standard is aimed at producers and engineers focusing on cost-effective on-site manufacturing and stringent quality assurance distinct from conventional building bricks.
Overview
The specification defines the criteria for burnt clay soling bricks chiefly employed as a base layer in road construction across India. It details the required dimensions, physical characteristics such as compressive strength and water absorption, quality benchmarks, sampling methods, and marking protocols to guarantee uniformity in production and performance. This standard is aimed at producers and engineers focusing on cost-effective on-site manufacturing and stringent quality assurance distinct from conventional building bricks.
Audience
Contents
Structure
This section outlines the range and principal attributes for burnt clay soling bricks used in construction, emphasizing standard sizes, dimensions, and permissible tolerances. It also covers rounding off of test results according to IS 2-1960 and references definitions from IS 2248-1981 related to burnt clay bricks. The standard brick dimensions are 190 mm length, 90 mm width, and either 40 mm or 90 mm depth, ensuring uniformity for construction applications.
All relevant terms are defined in line with IS 2248:1981 on burnt clay building bricks. Measurement rounding rules follow IS 2:1960, preserving the number of significant digits specified. Standard sizes and tolerances for soling bricks are reiterated to maintain consistent interpretation.
This part specifies the maximum permissible water absorption of 20% by weight after 24 hours of immersion, tested per IS 3495 (Part 2)-1976. It covers dimensional measurement protocols, marking requirements including optional ISI certification, and rounding off of test values. The manufacturing process ensures bricks meet these physical property criteria for durability and performance.
Quality checks involve measurement of dimensions with specified tolerances, confirmation of physical properties, and visual inspection for defects. The ISI mark denotes conformity to the standard and ongoing quality monitoring. Rounding off test results complies with IS 2-1960.
Standard dimensions are fixed at 190 mm length, 90 mm width, with depths of either 40 mm or 90 mm. Tolerances are specified to ensure uniformity, although some noted values in the original may contain typographical errors. Bricks must be free from cracks, flaws, and lime nodules, with flat rectangular faces and straight, right-angled edges.
Measurement involves selecting at least 20 bricks, cleaning surfaces, arranging in contact in a straight line, and measuring total length using a steel tape. Water absorption testing follows IS 3495 (Part 2)-1976. Rounding of results adheres to IS 2-1960 practices.
Sampling is conducted as per IS 5454:1978, selecting 20 or more bricks randomly from the batch. Bricks are cleaned before testing. Measurements are taken as a continuous stretch or in rows of ten if necessary, with rounding rules per IS 2:1960. Efflorescence must not exceed a slight rating as per IS 3495 (Part 3)-1976.
Bricks must be marked during moulding with the manufacturer's identification or initials and the brick type. Optionally, bricks may carry the ISI Certification Mark, indicating adherence to quality and inspection standards. Rounding off test data is done following IS 2-1960.
While IS 5779 does not explicitly specify packaging and storage, general best practices include stacking bricks on pallets or wooden trays, covering to prevent moisture ingress, and storing in dry, ventilated areas with stable stacking patterns not exceeding 1.5 meters in height. ISI marking aids in quality assurance through the supply chain.
Frequently Asked
According to the specification, soling bricks should measure 190 mm in length and 90 mm in width, with depth options of either 40 mm or 90 mm. Permissible tolerances include ±8 mm for length and ±4 mm for width and depth, ensuring consistent sizing suitable for road base construction. These dimensions and tolerances differ from those for standard building bricks due to the soling bricks' specialized use.
The standard mandates a minimum average compressive strength of 10.0 N/mm² for soling bricks, tested in accordance with IS 3495 (Part 1)-1976. This criterion ensures that bricks possess adequate strength for use in sub-base layers of roads and similar infrastructure.
Water absorption testing involves immersing a sample of at least 20 bricks in cold water for 24 hours following IS 3495 (Part 2)-1976. After immersion, bricks are surface-dried and weighed to calculate water absorption as a percentage of dry weight. The maximum allowable water absorption is 20%, ensuring durability and performance for road soling applications.
Bricks exhibiting cracks, flaws, or free lime nodules are disqualified due to compromised strength and durability. Additionally, bricks must have flat, rectangular faces and straight edges forming right angles; deviations from these conditions affect uniformity and bonding, leading to rejection.
Each brick should be marked during moulding with the manufacturer's identification or initials and the brick type. Optionally, bricks may bear the ISI Certification Mark, signifying compliance with Indian Standards and continuous quality monitoring by ISI. This marking facilitates traceability and quality assurance throughout the production and supply chain.
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