The period of time that the PMA blend is mixed should be sufficient to ensure an effective dispersion and subsequent integration of the cross linking agent and polymer to form {HEAD ~ a polymer network} within {TAIL ~ the asphalt}, thus forming the PMA 
within
The period of time that the PMA blend is mixed should be sufficient to ensure an effective dispersion and subsequent integration of the cross linking agent and polymer to form { HEAD ~ a polymer network } within { TAIL ~ the asphalt } , thus forming the PMA
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