Abstract
Curing of concrete is maintaining satisfactory moisture content in concrete during its early stages in order to develop the desired properties. « However good curing is not always practical in many cases, therefore the need to develop self-curing agents attracted several researchers ». « The concept of several self-curing agents is to reduce water evaporation from concrete and hence increase the water retention capacity of concrete compared to conventional concrete, the use of self-curing agent is very important from the point view that water resources are getting valuable every day ». This project summarizes various aspects of self-curing of concrete which can be of valuable assistance in adopting good construction practices at site. M25 grade concrete cube specimens prepared based on the standards and availability of materials without and with 30% of flyash and quarry dust replaced as cement and fine aggregate and cubes cured by covering them with a external self-curing compound BONDIT CURE WB, air dried and normal water. These specimens are then tested after 7,14 and 28 days to obtain the compressive strength in three different conditions. The compressive strength of concrete cubes is calculated and compressive strength of self-curing concrete is compared with the different conditions. At the end of curing period of 7,14 and 28 days the amount of water retained in self cured concrete cubes is calculated and compared with the air dried cubes. Water absorption test is conducted on air dried concrete and self cured concrete cubes and the amount of water is absorbed is calculate and compared.
Highlights
As 30% of fly ash replaced as cement in concrete, it has finer and rounded particles so it consumes lesser water workability increases
Compressive strength of self-curing concrete after 28 days curing period is more than the compressive strength of water cured concrete by 16.5% and 17.5% without and with replacement flyash and quarry dust respectively
Compressive strength of air dried concrete cubes is lesser than the designed target strength because lack of curing
Summary
“The concept of self-curing is to reduce the water evaporation from concrete and increase the water retention capacity of the concrete compared to conventional concrete, efficient curing improves the strength and durability of concrete, concrete curing compounds is considered to be most important since curing of concrete is a major challenge in the construction industry”. From the results it is observed that compressive Strength of air dried concrete cubes are lesser than compressive strength of water cured, self cured concrete cubes and after completion of 28 days curing period is lesser than the designed target strength. Because application self-curing agent on concrete cubes it arrests the water loss from the concrete and the amount of water present in the concrete is efficiently utilized for the complete hydration process It is used for getting strength more than the designed target strength. From the obtained results observed that compressive strength of non conventional concrete is higher than the compressive strength of conventional concrete at every stage of curing period and air dried, water cured and self cured concrete. After preparation of air dried concrete cubes taken the weights
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