The IS 10360:1982 standard outlines the specifications for lime-pozzolana concrete blocks utilized in paving applications like sidewalks and pavements. It details the required dimensions, material properties, manufacturing processes, and quality standards to guarantee reliable performance. This guideline is crucial for engineers, manufacturers, and contractors involved in urban infrastructure development.
Overview
The IS 10360:1982 standard outlines the specifications for lime-pozzolana concrete blocks utilized in paving applications like sidewalks and pavements. It details the required dimensions, material properties, manufacturing processes, and quality standards to guarantee reliable performance. This guideline is crucial for engineers, manufacturers, and contractors involved in urban infrastructure development.
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The lime-pozzolana concrete blocks must conform to standard dimensions of 300 mm in length, 300 mm in width, and 100 mm in height. The height is composed of 90 mm of lime-pozzolana concrete topped with a 10 mm layer of cement-sand mortar serving as the wearing surface. Tolerances allowed are ±5 mm for length and width, and ±1.5 mm for height. These measurements are taken in accordance with Appendix A of IS 2185 (Part 1) - 1979. The layered structure enhances abrasion resistance while maintaining overall block integrity.
IS 10360 specifies the use of lime, fly ash or burnt clay pozzolana, lime-pozzolana mixtures, along with coarse and fine aggregates conforming to IS 10359-1982. Fly ash and burnt clay pozzolana must meet their respective Indian Standards such as IS 3812 for fly ash. Aggregates should comply with IS 383. The raw materials must be free from defects and suitable to produce blocks with the required durability and strength.
According to IS 10360, the blocks must have an average compressive strength of at least 3.5 N/mm² (35 kgf/cm²), verified by testing three samples as detailed in Appendix C of IS 2185 (Part I)-1979. The abrasion resistance test, conducted on the mortar wearing surface as per IS 9284-1979, requires that the abrasion loss does not exceed 0.4%. These criteria ensure that the blocks are durable and suitable for paving under typical usage conditions.
To improve durability, a 10 mm thick wearing course of cement-sand mortar in a 1:3 ratio is applied atop the lime-pozzolana concrete block. This mortar layer provides enhanced abrasion resistance and protects the underlying concrete. The wearing surface must comply with abrasion loss limits specified in IS 9284-1979, not exceeding 0.4%. Proper bonding and absence of surface defects are essential to maintain performance.
Compliance is ensured by sampling 15 blocks randomly from each lot, using mutually agreed random number tables, as per Appendix A of IS 10360. Of these, 3 blocks undergo compressive strength testing, 3 for drying shrinkage followed by moisture movement tests, 3 for abrasion resistance, 3 for flexural strength, and 3 are reserved for retesting drying shrinkage and moisture movement if needed. Test results are rounded following IS 2:1960 rules and compared against prescribed limits to accept or reject the lot.
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