Page 98 - ICJ Jan 2023

TECHNICAL PAPER COLLECTOR’S EDITION

Crushed stone waste as fine

aggregate for concrete

A.K. Sahu, Sunil Kumar and Sachan

The suitability of crushed stone dust waste as fine aggregate for concrete has
been assessed by comparing its basic properties with that of conventional
concrete. Two basic mixes were chosen for natural sand to achieve M 20 and M
30 grade concrete. The equivalent mixes were obtained by replacing natural sand
by stone dust partially and fully. Test results indicate that crushed stone dust
waste can be used effectively to replace natural sand in concrete. Concrete made
with this replacement can attain the same compressive strength, comparable
tensile strength, modulus of rupture and lower degree of shrinkage as the control
C onventionally concrete is a mix of cement, sand and aggregate. Continuous
concrete.

research efforts have established concrete as a versatile material; concrete required for extensive
construction activity can always be made available, since all the ingredients of concrete are of
geological origin. In the production of concrete, granite/basalt stone and river sand are used as
coarse and fine aggregate, respectively. Although these materials are usually available, at some
places it is economical to substitute these materials by locally available ones. River sand which
is most commonly used as fine aggregate in the production of concrete and mortar poses the
problem of acute shortage in many areas. At the same time increasing quantity of crushed stone
dust is available from crushers as waste. The disposal of this dust is a serious environmental
problem. If it is possible to use this crushed stone dust in making concrete and mortar by partial/
full replacement of natural river sand, then this will not only save the cost of construction but at
the same time it will solve the problem of disposal of this dust.
For satisfactory utilisation of this alternative material, the various phases of examination have
to be:

• technical feasibility
• durability of processed concrete

• economic feasibility
With the ongoing research being done to develop appropriate technology and field trials to
monitor the performance and assessment of economic feasibility, the use of this alternative
material will become more viable.

The Indian Concrete Journal | November 2018 99