Process of Quickly Manufacturing Critically Shaped Concrete Products of High Strength

1. The process of fast-curing concrete products of critical shapes and strength requirements having a Portland cement binding agent that reeacts with water in an exothermal relationship, thereby to provide substantially maximum strength in a few hours manufacturing time without substantial cracking or distortion of shape, comprising the steps of, locating a large number of uncured concrete products in a kiln, and successively treating the products in the kiln by circulating gasses therethrough with a series of curing steps comprising variably controlling the amount of humidity in the kiln to maintain saturation substantially only until substantially all the cement in the concrete chemically reacts with water. preventing the temperature due to the chemical reaction between cement and water in the concrete products from increasing above a temperature which would result in cracking, misshaping or reducing the strength of the concrete product during an initial set period before enough chemical conversion is achieved, thereby to reduce the temperature rise of the concrete resulting from exothermic cement to water reaction by circulating cooler gasses effected by introduction of water thereinto thereby decreasing temperature and increasing humidity to prevent concrete damage by loss of water during the period when exothermal heating is produced by the water to cement chemical reaction, increasing the temperature of the circulated gasses after the exothermic temperature falls, due to a substantial chemical conversion of cement in the presence of water, at a controlled rate not sufficient to damage the strength or structure of the concrete products up to a predetermined maximum temperature, and maintaining that maximum temperature until substantially all the cement in the concrete chemically reacts with water, adding a controlled amount of just enough cold water to the circulated gasses providing a heated atmosphere within the kiln concurrently with the initiation of the step of increasing the temperature of the circulated gases to produce saturation humidity and thereby prevent dehydration of the products and reduction of damage to the strength of the concrete products by reducing the water available for the cement-water reaction in the concrete product, and drying the products by circulation of said gases with increased temperature and discontinuing addition of water thereby causing a considerable reduction in the water in the products after the cement in the product is substantially all chemically reacted, whereby an energy efficient system is produced.