A kind of green mortar made from construction waste and its preparation method

Abstract

The invention relates to a green mortar made from construction waste and a preparation method thereof. The raw materials include the following components in parts by weight: 900-1000 parts of regenerated construction waste sand, 720-4500 parts of pottery sand, and 900-950 parts of cement , 150-200 parts of gypsum, 900-1050 parts of water, 10-13 parts of water reducing agent, 10-13 parts of cellulose ether, 10-13 parts of rubber powder, 20-25 parts of EPS, the preparation method of the green mortar is as follows: Weigh the raw material components according to the weight ratio of each component, add them into the cement paste mixer, and stir for 0.5 to 1 minute; add the remaining water into the cement paste mixer, and stir for 2 to 4 minutes to obtain the green mortar. Compared with the prior art, the invention realizes rational utilization of regenerated sand from construction waste, and prepares green mortar with good thermal insulation performance, meeting engineering requirements, and having functions of water reduction, coagulation acceleration, water retention, and water repellency.

Description

technical field [0001] The invention relates to a building material, in particular to a green mortar made from construction waste and a preparation method thereof. Background technique [0002] In recent years, in our country, most of the construction waste has not been treated, and it is only disposed of in the open air or landfilled, thus causing a large degree of pollution. At present, the total amount of construction waste in my country accounts for about 30% to 40% of the total amount of urban waste. Most of the waste is transported to the suburbs or villages by the construction unit without treatment, and is disposed of by open-air stacking or landfill, which consumes a lot of waste. Land requisition fees, garbage removal fees, and at the same time, problems such as spillage and dust flying during the removal and stacking process have caused serious environmental pollution. How to turn these construction wastes into treasures and wastes into resources has become an urg...

AI Technical Summary

Problems solved by technology

[0004] Regarding the utilization of construction waste, the current situation in our country is: 1. Most construction waste is untreated, and the construction waste treatment is complicated. It is only placed in the open air or landfilled for treatment, causing a large degree of environmental pollution; 2. The proportion of ordinary mortar If the proportion is unreasonable, the dosage is not in place, and the mixing is uneven, the quality of cement mortar will be affected; 3. The water retention of ordinary mortar is poor; 4. It takes a long time for ordinary mortar to reach the predetermined strength.

[0005] Chinese patent CN 108275944A discloses a method for preparing recycled mortar from waste concrete. The raw materials for preparing the mortar include cement, grade 95 mineral powder, grade II coal ash, gravel, water, water reducing agent, natural yellow sand, recycled sand, The weight of recycled sand accounts for 10-30% of the total weight of natural yellow sand and recycled sand; however, the strength, durability, and fluidity of the recycled mortar prepared by this formula need to be improved, and the mortar has a relatively heavy weight, which does not meet the requirements of light weight. Environmental Performance Requirements

[0006] Chinese patent CN104909642A discloses a thermal insulation mortar for spraying construction containing recycled construction waste powder, the preparation raw materials include construction waste recycled powder, gel material, redispersible latex powder, hydroxypropyl methyl cellulose ether, Anti-cracking fiber, anti-sagging agent, water-repellent agent, air-entraining agent, water-reducing agent and water to obtain thermal insulation mortar with flame retardancy, thermal insulation and compressive and tensile strength, which is suitable for thermal insulation of internal and external walls of buildings ; But this patent is mainly to improve the fluidity and sprayability of the mortar, the long-term stability of the mortar obtained by the patent needs to be improved, and further reduce the density of the mortar and improve the thermal insulation performance of the mortar on the premise of ensuring the strength of the mortar of great significance

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