Abstract
The paper is concerned with determining the effect of remixing of two different grades of concrete proving blend ratio, time lag & intermittent curing sequence. Two mix designs (M40 & M50) selected and provide blend ratio (0 to infinity) at 0,30,60,90 & 120min time lag. In this research, the problem related to improper casting & curing sequence, which ultimate formation of the cold joint due to old and fresh concrete. Curing method applied with four sequences Air0 Water28, Air28 Water0, Air7 Water21, and Air21 Water7.Concrete samples were made and tested for their compressive strength, flexural strength, elastic modulus, and shrinkage properties in the laboratory. As compared to the strength of freshly prepared concretes to the hard in situ concrete tends to show a reduction in its various strengths due to improper curing & formation of cold joints. This reduction is further possible to be minimized to a certain extent on blending some quantity of a relatively fresh mix to the existing quantity of the hard in situ concrete.
Highlights
To improve the intermittent curing adverse effect selfing and crossing methodology was adapted. In this methodology reuse the preset concrete by adding fresh concrete to form a remix by considering their time lags, blend ratio and various curing sequences [1 & 2]
Considered the curing conditions are, A00W28, A07W21, W14A14, A21W07, A28W00, for various blend ratio viz., r = ∞, 3.00, 1.00 and 0 as well as time lag t 0.00. 30.00, 60.00, 90.00, 120.00 and 150.00 min is used for the test.All the specimens were demolded the day and put to curing for 'the specified periods in water as per the various planned, improper curing sequences as mentioned above
The individual types considered within the scope of the present investigation are concreting of normal as well as higher grades each of these mix types again cured under various cumulative improper curing sequences
Summary
Hydration process provides strength of concrete [20 & 23]. The hydration process is closely related to concrete microstructure development, proper curing measures are necessary to maintain satisfactory moisture and temperature condition [4 & 11]. To improve the intermittent curing adverse effect selfing and crossing methodology was adapted In this methodology reuse the preset concrete by adding fresh concrete to form a remix by considering their time lags, blend ratio and various curing sequences [1 & 2]. There are some factors which cause the delaying process is that improper method of handling, work schedule, lack of site organization and the breakdown of equipment To overcome such problems, the process of remixing concrete, if necessary, with the addition of just the required quantity of water is known as „retempering‟ of concrete. Effect of Remixing & Intermittent Curing Sequences on Strength of Pavement Quality Concrete
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