초록 ▼

The present invention relates to concrete, mortar and other hardenable mixtures comprising cement and fly ash for use in construction. The invention includes a method for predicting the compressive strength of such a hardenable mixture, which is very important for planning a project. The invention a

The present invention relates to concrete, mortar and other hardenable mixtures comprising cement and fly ash for use in construction. The invention includes a method for predicting the compressive strength of such a hardenable mixture, which is very important for planning a project. The invention also relates to hardenable mixtures comprising cement and fly ash which can achieve greater compressive strength than hardenable mixtures containing only concrete over the time period relevant for construction. In a specific embodiment, a formula is provided that accurately predicts compressive strength of concrete containing fly ash out to 180 days. In other specific examples, concrete and mortar containing about 15% to 25% fly ash as a replacement for cement, which are capable of meeting design specification required for building and highway construction, are provided. Such materials can thus significantly reduce construction costs.

대표청구항 ▼

[ What is claimed is:] [1.] A method for predicting a compressive strength of a hardenable mixture containing cement and fly ash comprisinga) measuring a fineness modulus of fly ash wherein the fineness modules defines a distribution of sizes or distribution of partial volumes; andb) preparing cemen

[ What is claimed is:] [1.] A method for predicting a compressive strength of a hardenable mixture containing cement and fly ash comprisinga) measuring a fineness modulus of fly ash wherein the fineness modules defines a distribution of sizes or distribution of partial volumes; andb) preparing cementitious materials comprising cement and fly ash of a measured fineness modulus;c) calculating the sum of:i) a compressive strength contributed by the cement, which is a function of the amount of cement; andii) a compressive strength contributed by the fly ash of a measured fineness modulus, wherein the compressive strength contributed by the fly ash of a measured fineness of modulus is a function of the fineness modulus of the fly ash, the amount of fly ash in the mixture, and the age of the hardenable mixture in days; rein the sum of (i) and (ii) corresponds to the compressive strength of the hardenable mixture.