EFFECTOFIMPROPERCURINGONTHE STRENGTH AND TRANSPORT PROPERTIES OF LOW GRADE RHA CONCRETES
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Abstract
This project work was created in order to highlight and present the findings from a study
on the "EFFECT OF IMPROPER CURINGON THESTRENGTHANDTRANSPORT
PROPERTIES OF LOWGRADERICEHUSKASH(RHA)CONCRETE"withthe
goal of understanding how various curing techniques for 3, 7, 14 and 28 days affect the
achievable compressive strength and other structural properties of a low grade concrete
such as 20MPA having Ordinary Portland Cement (OPC) (an agriculturally based
pozzolanic material, lying in abundance around the globe most times as waste, found
suitable by researchers to partially replace OPC in the production of concrete).
After designing a low grade concrete mix with a goal mean strength of 20N/mm2, a
number of concrete mixtures cast into 100mm metallic cubes were made in the lab using
OPCas the binder (partially substituted with RHA at various percentages). In a
fog/curing room with ambient temperatures between 30 and 20 °C and low relative
humidity (RH), three different types of "curing methods" (a moisture management
balancing act) were used for these samples. The first series of cubes cast after
demoulding were fully submerged in water and cured at 100% RH for the duration of its
curing period (signifying wet curing). The final set of cubes cast were completely cured
out in open air without any water submerging after demoulding (signifying dry/air
curing), while the other set of cubes stayed in water for 3 days after demoulding as well
and then continued to cure for the remaining curing period at a relatively low humidity.
Therefore, performance was assessed in terms of compressive strength, transport
properties, and other tests conducted. It was found that while the strength of RHA
concrete continued to decline after the addition of 15% RHA, the replacement level of
5%RHAgavethe strongest results overall and demonstrated the greatest potential to be
used as a useful material for various building materials. The partial replacement of RHA
with OPC can be seen to have a positive impact on the environment by reducing the
amount of agricultural waste produced, which results in more cost-effective and
environmentally friendly concretes than those currently used in the industry.
on the "EFFECT OF IMPROPER CURINGON THESTRENGTHANDTRANSPORT
PROPERTIES OF LOWGRADERICEHUSKASH(RHA)CONCRETE"withthe
goal of understanding how various curing techniques for 3, 7, 14 and 28 days affect the
achievable compressive strength and other structural properties of a low grade concrete
such as 20MPA having Ordinary Portland Cement (OPC) (an agriculturally based
pozzolanic material, lying in abundance around the globe most times as waste, found
suitable by researchers to partially replace OPC in the production of concrete).
After designing a low grade concrete mix with a goal mean strength of 20N/mm2, a
number of concrete mixtures cast into 100mm metallic cubes were made in the lab using
OPCas the binder (partially substituted with RHA at various percentages). In a
fog/curing room with ambient temperatures between 30 and 20 °C and low relative
humidity (RH), three different types of "curing methods" (a moisture management
balancing act) were used for these samples. The first series of cubes cast after
demoulding were fully submerged in water and cured at 100% RH for the duration of its
curing period (signifying wet curing). The final set of cubes cast were completely cured
out in open air without any water submerging after demoulding (signifying dry/air
curing), while the other set of cubes stayed in water for 3 days after demoulding as well
and then continued to cure for the remaining curing period at a relatively low humidity.
Therefore, performance was assessed in terms of compressive strength, transport
properties, and other tests conducted. It was found that while the strength of RHA
concrete continued to decline after the addition of 15% RHA, the replacement level of
5%RHAgavethe strongest results overall and demonstrated the greatest potential to be
used as a useful material for various building materials. The partial replacement of RHA
with OPC can be seen to have a positive impact on the environment by reducing the
amount of agricultural waste produced, which results in more cost-effective and
environmentally friendly concretes than those currently used in the industry.
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