C.R.R.I charts are used to obtain a relationship between strength of concrete and

Concept:CRRI prepared charts to obtain the relationship between compressive strength of concrete with water-cement ratio.Central Road Research Institute (C.R.R.I.) is a premier national laboratory established in 1950, engaged in carrying out research and development projects on design, construction, and maintenance of roads and runways, traffic and transportation planning of mega and medium cities, management of roads in different terrains, improvement of marginal materials, utilization of industrial WASTE in road construction, LANDSLIDE control, ground improvements environmental pollution, road traffic safety, analysis and design, wind, fatigue, corrosion studies, performance monitoring or evaluation, service life ASSESSMENT and rehabilitation of highway and railway bridges.The institute also provides TECHNICAL and consultancy SERVICES to various user organizations in India and abroad.