PSI - Issue 70

M. Vignesh et al. / Procedia Structural Integrity 70 (2025) 650–657

656

4.6.Comparison with conventional bricks Conventional bricks of class 7.5 as per IS 1077 part-1: 2002 and IS 2894:2002 have strength more than 7.5 MPa. IS 2212:2005 specifies these bricks for external and internal wall constructions. Table 4 depicts the comparison of produced bricks with conventional bricks.

Table 4. Comparison with conventional bricks

Nature of production

Compressive strength

Codal provision

Types of bricks

Materials

Burnt clay bricks

Clay, fine silt and water Lime, gypsum, flyash and m-sand Lime, WMP, flyash, WFS, CDW and water.

Burning Unburnt

>7.5 MPa (class 7.5) >7.5 MPa (class 7.5)

IS 1077 part-1 : 2002

Conventional fly ash bricks Manufactured brick in our work (FC60WM5) CD10FC50WM5

IS 2894:2002

Unburnt

9.13 MPa

IS 2894:2002

Lime, WMP, flyash, WFS, CDW and water.

Unburnt

7.29 MPa

IS 2894:2002

Conventional flyash bricks uses binder content of lime and gypsum to 20%, but the bricks we manufacture has the possibility to reduced binder content to 15%. Addition of gypsum is fully replaced with wmp and lime usage is also reduced using wmp addition. Reduced density of wmp and wfs with respect to gypsum and m-sand makes the bricks lighter in weight and comparable in strength to conventional flyash bricks. 5. Conclusion Experimental analysis exhibited the possibility of incorporating CDW, WFS in the place of lime and manufactured sand for the manufacture of flyash bricks. WFS had all the possibilities to be replaced in the place of manufactured sand. Optimum quantity of WFS addition has been spotted out as 20%. • Water to binder ratio can be fixed at 0.3, excess addition of water increases fluidity of the bricks and affects the strength properties. • Optimum quantity of lime and cement can be restricted to 5% for achieving strength of bricks upto 10MPa. Remaining binding property can be achieved by the addition of WMP and CDW. Table 5 compares the compressive strength of the produced bricks with conventional bricks. • CDW had the possibility to be included at a proportion of 10-20% as binding material in the production of unburnt bricks of class-10 as per IS 12894:2002. • Further studies can be concentrated on strength enhancement of ecofriendly bricks. Examination of durability and acoustic performance of ecofriendly bricks can be performed inorder to promote energy efficiency of the structure. Performance of ecofriendly bricks in masonry must also be studied for analysing the usability of bricks in civil structures.

Table 5. Compressive strength comparison with conventional bricks Types of bricks Compressive strength Codal provision Burnt clay bricks >7.5 MPa (class 7.5) IS 1077 part-1 : 2002 Conventional fly ash bricks >7.5 MPa (class 7.5) IS 2894:2002 Manufactured brick in our work (FC60WM5) 9.13 MPa IS 2894:2002 CD10FC50WM5 7.29 MPa IS 2894:2002