Method for preparing self-compacting concrete by using herbal pulp waste liquid

Abstract

The invention discloses a method for preparing self-compacting concrete by utilizing a herbal paper pulp waste liquid. The method comprises the following steps: filtering suspended substances and sediments out of the herbal paper pulp waste liquid, subjecting the suspended substances and the sediments to co-sintering with titanium gypsum and the like so as to obtain a powder material, blending substances filtered out of a filtrate through a hollow fiber ultrafiltration film with a plurality of substances like sodium sulfite and polyaniline so as to obtain an additive, and mixing the additive with the powder material, fine aggregate, coarse aggregate, water and the like so as to prepare the self-compacting concrete. According to the invention, main pollution components are separated from the herbal paper pulp waste liquid and used as auxiliary components of the self-compacting concrete after simple treatment, so environmental protection treatment of a large amount of the herbal paper pulp waste liquid can be realized; and comprehensive performances of the self-compacting concrete can be greatly improved, e.g., a water-cement ratio can be greatly reduced; the strength, compactness, compressive strength, tensile strength, heat and frost resistance, salting resistance and permeability resistance of the self-compacting concrete are improved; the service life of the self-compacting concrete is long; and corrosion of reinforcing steel bars to the self-compacting concrete can be greatly retarded.

Description

technical field [0001] The invention relates to a self-compacting concrete, in particular to a method for preparing self-compacting concrete by using herbal pulp waste liquid, and belongs to the field of building materials. Background technique [0002] Lignin is the second largest renewable resource in nature, regenerated at a quality of 50 billion tons per year, but lignin is difficult to be metabolized and degraded by microorganisms, and is often discharged as waste in the biomass industry. my country's paper industry mainly uses various wood and herbaceous plants as raw materials, such as poplar, eucalyptus, reed, wheat straw and bagasse. The paper industry discharges a large amount of foul smelling and toxic black liquor, the main component of which is alkali lignin that cannot be used by microorganisms. It is estimated that the annual discharge of lignin by my country's paper industry is as high as 40 million tons. At present, the main way to deal with the lignin in t...

AI Technical Summary

Problems solved by technology

Although such an application scheme is green and environmentally friendly, it needs to separate lignin from the papermaking black liquor, and its usage in concrete should generally not exceed 0.3wt%. The cost is high and the consumption of papermaking black liquor is small. Other large solids separated from the black liquor need to be post-treated