Study On The Preparation Of Vegetated Foam Concrete And The Mechanism Of Its Alkali Reduction

With the development and progress of society,the contradiction between the acceleration of urbanization and the increase of human requirements for environmental ecology has become increasingly acute.Improving the urban green coverage rate is to improve the living environment,improve the quality of life,and reduce energy consumption.And the city's green area is not enough.How to increase the green area in a limited space? Many researchers have proposed the concept of vegetative concrete,that is,plant-compatible concrete.Most of this kind of traditional plant-grown concrete uses large-aperture concrete.The large-aperture concrete is used as a skeleton to fill the aperture with soil,plants are planted in the soil,and the large-aperture concrete is carbonized and alkali-reduced before placing the soil.In this traditional plant-growing concrete,the plants still grow in the soil and have not reached the plant-compatible type,and as the age grows,the cement slowly releases calcium hydroxide and penetrates into the soil,making the pH value in the soil too high.An environment in which plants cannot be grown at long age.Therefore,this study is different from traditional plant concrete.It does not use foam concrete as the plant substrate.It uses SAP particles to encapsulate plant rhizomes or seeds.When the slurry is stirred,SAP particles that absorb the alkali-reducing substances in advance can be used to make foam concrete in the long-term.The lower pH value is maintained in a range suitable for plant growth.With low alkalinity sulpHoaluminate cement,the pH value of the cement paste is about 10.5.The experiments explored the effects of fly ash and white carbon black on the pH value of foam concrete,and also explored the alkali-reducing effects of different alkali-reducing substances such as boric acid,copper sulfate,and ferric chloride.The results show that the addition of fly ash and white carbon black can reduce the pH value of foamed concrete,and boric acid also has a good alkali-reducing effect.In this study,a hydrogen peroxide chemical foaming method was used to prepare foamed concrete.SAP particles were introduced in the experiment to investigate the effects of different amounts of SAP particles on the mechanical properties of foamed concrete.I want to use SAP granules to absorb alkali-reducing substances in advance,add it to the foamed concrete that has been stirred,and maintain the internal pH value of the foamed concrete under long-term age.Detection method to investigate whether there is any pHenomenon of analysis.Because plants need water,nutrients,and a suitable pH value for growth,experiments use SAP particles' high water absorption properties to absorb water and slowly release water,alkali-reducing substances,and nutrients.So explore the change trend of the permeability of foamed concrete with the increase of its content.Good permeability indicates poor water storage performance,and vice versa.XRD was used to investigate the composition of vegetation foam concrete,and the internal microstructure of vegetation foam concrete was observed by scanning electron microscope.The purpose of this article is to explore the life support system and structural composition of vegetative foamed concrete,and to solve the problem from two aspects,so as to establish a plant-compatible foam concrete suitable for plant growth.Striving to break through the technical defects of traditional single plant concrete,promoting the development of plant concrete technology,and improving the practical use of plant concrete have important theoretical basis and practical significance.It also contributes to the increasingly serious environmental problems.