ByShri S.K.SaxenaV.P & Unit Head

JK LAKSHMI CEMENT LTD

LC3 cement produced in Gujarat was provided to JK Lakshmi cement

Testing of the cement was carried out AAC blocks were produced replacing OPC

with LC3

Test Result

Standard Consistency 31.25%

Blaine's Fineness (m2/kg) 665

Initial Setting time (min) 25

Final Setting time (min) 100Loss on Ignition 7.44%

3 Days Strength (MPa) 27.4

7 Days Strength (MPa) 35.8

28 Days Strength (MPa) 49.8

Test Result

Residue on 45 micron 19.8%

Reside on 90 micron 2.8%

L.C. 0.5

SO3 1.83%Insoluble Residue `19.52%

The cement gave good strength at all ages The setting time and fineness of the cement

have to be regulated The clays should be chosen based on colour

or calcination should be controlled to reduce red colour

The cement has good potential in utilisationof low grade limestone

LC3 appears to be a commercially interesting alternative for the industry

AAC blocks were produced by carrying out 1:1 replacement of OPC by LC3

There was no issue of workability of the paste for the blocks

The colour of the cement was not visible due to large quantity of fly ash

The mix design had to be slightly adapted The strength of the blocks was comparable to

normal production

Name of Parameter AAC LC3

Block Density(Kg/M3) 585 579

Compressive strength 4.9 4.6 (N/mm2)

Exposed wall: Blocks are visible here

JK Lakshmi, IIT Delhi and TARA have signed an MoU to produce LC3 jointly

Good quality clays have been found at least in Gujarat and Rajastan

Calcination facilities readily available Detailed research programme with IIT Delhi

has been set up◦ Areas other than LC3 are also being investigated