Single component alkali-activated cementing material taking lime-sodium carbonate as activator

Abstract

The invention discloses a single component alkali-activated cementing material taking lime-sodium carbonate as an activator, wherein the mole ratio of lime to sodium carbonate is 1:1, a volcanic ash active material is taken as the object to be activated, and the cementing material is obtained by dry-mixing lime, sodium carbonate, and the volcanic ash active material. The compressive strength of the cementing material is 1.2 to 1.3 times stronger than that of cement (P.O 42.5). Water can be directly added into the cementing material and then the cementing material can be used. During the primary period of blending, the alkalinity is low, the setting time is proper, furthermore, the setting time can be adjusted by adjusting the added alkali amount or the ratio of quick lime to slaked lime, and the cementing material has a good application prospect in engineering.

Description

technical field [0001] The invention belongs to the technical field of inorganic gelling building materials, and in particular relates to a single-component alkali-activated gelling material using "lime+sodium carbonate" as an activating agent. Background technique [0002] At present, with the rapid development of the global economy, the development of the construction industry is particularly rapid, and the use of concrete is huge, which involves the use of a large amount of Portland cement. The raw materials for the production of Portland cement are mainly high-quality limestone and clay minerals, which require a large amount of natural mineral resources to be mined, and the production of Portland cement requires a "two grinding and one burning" process, which involves the consumption of a large amount of coal resources and power resources. As well as the emission of harmful gases such as carbon dioxide, the production of Portland cement greatly pollutes the environment a...

AI Technical Summary

Problems solved by technology

However, at present, the commonly used activators for alkali-activated gelling materials are water glass, sodium hydroxide, or a combination of the two. The activator is expensive, the alkali solution needs to be prepared separately (inconvenient to use), and the high-alkaline solution in the early stage of mixing will be difficult. Various problems such as harm to the human body and too fast coagulation time have made it difficult to promote it in engineering for a long time.