Rice Husk Ash is used in concret with many advantages

1. seminar on
RICE HUSK ASH
PRESENTED BY- GUIDE
MOHAMAD MUJTABA HARSHA.D.SAPKAL

2. A valuable green resource with great
potential

3. What is Rice husk ash ( RHA)
Obtained from burning protecting outer cover of rice husk
It consists of non-crystalline silicon dioxide (SiO2) with
high specific surface area and high pozzolanic
reactivity.
The RHA can be found as natural materials, by-products
or industrial wastes
Chemical propertie so fare closer to micro silica ,silica
fime

4. RICE HUSK RICE HUSK
ASH

5. HOW RHA PRODUCE
Chemical compositions of RHA are affected due to
burning process and temperature
RHA produced by burning rice husk between 600 to
700°C temperatures for 2 hours

6. Blaine Specific Surface (cm2/g) 13150
Specific Gravity (cm2/g) 2.21
Mean Particle size (μm) 10.61
Passing # 325 (%) 95.10
Chemical properties
SiO2 90.16
Fe2O3 0.41
Al2O3 0.11
CaO 1.01
MgO 0.27
SÔ3 0.12
Al2O3 + Fe2O3 0.52
SiO2 + Al2O3 + Fe2O3 0.93
Na2O 0.01
K2O 0.65
Table 1 Physical and Chemical Properties of RHA

7. How RHA improves concrete
 OPC reacts with water to form two products
 Calcium silicate hydrate :it gives strength and
durability to concrete
 Calcium hydroxide
 reacts with CO2 causing effloresce
It creates negative effects on concrete

8. Addition of RHA
1.Increases calcium silicate hydroxide
2.Decreases calcium hydroxide
Ca(OH)2+SiO2=H2O+CaSiO3
The major benefits of the reaction are
High strength
Reduced efflorescence
Reduce sulphate attacks
Reduce chemical attacks

9. Uses of RHA
 RHA can be used in the 2 distinct ways
1)To create HPC –RHA can be added to cement to
increase high strength concrete
2)To create Green Concrete-RHA can be used as an
substitute to reduce amount of cement with higher
strength

10. Carbon credits
 The production of 1 Tons of cement contributes to 1
tons of co2 in atmos,
 Worldwide 7% of carbon dioxide emission for
production of OPC
 The utilization of RHA in concrete production is
solution to reduce the cement

11. ADVANTAGES
 Improves compressive strength, flexural strengths
and split tensile strength.
 RHA mixed concrete shows better bond strength as
compared to OPC concrete.
 Permeability of concrete decreases chloride diffusion
and chloride permeation reduces (30%) replacement.
 RHA makes a role to increased resistance to chemical
.

12. DISADVANTAGES
 Suitable incinerator/furnace as well as grinding
method is required for burning and grinding rice husk
in order to obtain good quality ash.
 Strength of concrete is reduced for larger (beyond
30%) replacement.
 There is a little transportation problem.
 Unburnt RHA is not suitable for concrete production

13. CONCLUSION
 To study the effect of RHA as substitute for fine
aggregate in concrete mixture.
 The properties of concrete containing RHA had been
successfully studied.
 The use of RHA in civil construction, besides reducing
the environmental polluters’ factors, may bring several
improvements fotg544r the concrete characteristics.

14. REFRENCE
 1.M.S.SHETTY CONCRETE TECHNOLOGY
 2.Effect of Rice Husk Ash on Cement Mortar and
Concrete. Sudisht Mishra,
Prof (Dr.) S. V. Deodhar.
 3. Effect of Rice Husk Ash on Lime Stabilization. Dr. J. N.
Jha (Member) K. S. Gill
 4.Effect of Rice Husk Ash on Cement Stabilized Laterite.
MUSA ALHASAN