الفهرس 
Compatibility of different types of concrete admixtures used for retempering of fiber reinforced concrete
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Abstract
Prolonged mixing is one of the problems that face ready mixed concrete industries as it affects the workability of concrete. An experimental program was conducted to investigate enhancing the workability using retempering procedure. Three types of FRC mixes were exposed to prolonged mixing up to 2 hours mixed with 4 types of admixtures (type G, type D, type F, silica fume) at initial mixing and then with superplasticizer (type F) after two hours of mixing. Slump, Slump loss, temperature and setting time were measured as fresh concrete properties. Compressive strength, flexural strength, splitting strength, modulus of elasticity, permeability and density were measured as hardened concrete properties. results of the experimental work show that retempered concrete properties were enhanced comparing with non retempered mixes. Retempering procedure is recommended instead of wasting bulk concrete