US 2025/0187979 A1 · Method for Producing Lightweight Concrete Mixtures Using Lightweight Aggregates

Abstract

The invention provides a method for producing lightweight concrete mixtures using lightweight aggregates, comprising an at least two-stage mixing process, where first a suspension mixture comprising the binder composition is prepared by high-speed stirring with a cement or a geopolymer and water and then the suspension mixture is mixed by low-speed stirring with constituents including the lightweight aggregates. The invention also embraces lightweight concretes and lightweight concrete mixtures produced accordingly. Binder composition candidates include, for example: —60-80 wt % finely ground slag sand cement, 10-60 wt % fly ash—2-25 wt % alkali metal hydroxides/alkali metal silicates, 75-98 wt % finely ground slag sand—2-20 wt % alkali metal hydroxides/alkali metal silicates, 60-78 wt % finely ground slag sand—20-38 wt % fly ash cement, 30-50 kg/m (in the lightweight concrete mixture) microsilica cement, 10-60 wt % rice husk fly ash cement, 1-5 wt % caustic calcined CaO/MgO

Claims40

Dependent claims

A method for producing a lightweight concrete mixture, comprising at least the following steps:

(A) bringing together at least water and a binder composition,
wherein the binder composition comprises at least cement or geopolymers as binders, and mixing with a high-speed stirring tool to obtain a suspension mixture,
wherein the weight ratio of water to binder composition in the suspension mixture is 1:5 to 1:1;
wherein the binder accounts for at least 40% by weight of the binder composition,
wherein the binder is added as powdery solid, and
(B) bringing together the suspension mixture or portions of the suspension mixture with at least lightweight aggregates or portions of the lightweight aggregates, and
mixing with a low-speed stirring tool to obtain a lightweight concrete mixture,
wherein the lightweight aggregates have a bulk density of 40 to 1000 kg/m3, and
wherein the mixing with the high-speed stirring tool takes place at a circumferential speed, which is more than three times as high as the circumferential speed when mixing with the low-speed stirring tool,
wherein the mixing with the slow-speed stirring tool is carried out in a free-fall mixer or a conical mixer.

7 more elements

Dependencies are inferred from the claim text.

Method for Producing Lightweight Concrete Mixtures Using Lightweight Aggregates

Life of this patent

Method for Producing Lightweight Concrete Mixtures Using Lightweight Aggregates

Life of this patent

Abstract

Claims40