| As a kind of material with the characteristics of light weight and fluidity,bubble mixed lightweight soil has been used more and more widely in engineering in recent years.Due to the addition of bubbles,it has different characteristics from ordinary concrete.Therefore,it is the basic condition for the formation of bubbles.The performance of bubbles is closely related to the performance of bubbles mixed with lightweight soil.Compared with developed countries,there is still a gap between China and developed countries in the study of bubble mixed LCLs.According to less species of foaming agent in our country,the performance is different,in this paper,by reference to domestic and foreign experts and scholars research on foaming agent,based on the research status quo of the foaming agent,for the preparation of a suitable for bubble mixed light soil and can actually used in engineering exploration of foaming agent,systematically developed ion and nonionic foaming agent.In this paper,on the basis of the principle of ion and nonionic surfactant compound with select material preparation a high-performance foaming agent to explore,in this paper the distribution of exploring experiment,foaming agent sodium dodecyl sulfate anion surfactant selected as the main foaming ingredient,lauric acid isopropyl alcohol amine nonionic surfactants as stable foam composition,In addition,dodecyl alcohol and silicone polyether emulsion were used as foaming stabilizing components.The properties of ion-non-ionic surfactant were investigated through the compound test under the raw material.Found in to explore preliminary experiments,the foaming agent performance experiments in the process of foaming device has some impact on the performance of air bubbles,and on the properties of foaming agent on foaming device tests have been carried out to explore,get the foaming device under different speed and different speed time distribution of the bubble foam,foam stability,foam and foaming agent under the optimal performance of optimal parameters.On this basis,the optimal formula of ion-non-ionic foaming agent and the corresponding raw material parameters were obtained through the compound of different foaming agent materials.The optimal raw material ratio of the ion-non-ionic foaming agent: water: sodium dodecyl sulfate:silicone polyethyl ether emulsion: lauryl alcohol: mono-isopropanolamide lauric acid was 1:0.093:0.03:0.028:0.007.The ion-non-ionic foaming agent has rich foaming capacity and high stability.The 1h sedimentation distance is 7.4mm,and the 1h bleeding water is 2.4 m L.Considering that the foaming agent is based on the ion-non-ion compound mechanism and other auxiliary effects,compared with the current market foaming agent,the foaming agent has advantages of good foaming performance,excellent foaming stability and high economic benefits.During the research process of this paper,the foaming agent formula has applied for the national invention patent: A compound foaming stabilizer(CN109748534A)is introduced.Based on the successful development of the foaming agent,the foaming agent is prepared into bubbles mixed with light soil and uniaxial test is carried out to explore whether it has practical engineering benefits,so as to provide a reference for the practical application of the foaming agent and bubbles mixed with light soil and the development of subsequent corresponding research.Through the preparation of ion-non-ionic foaming agent,it and the control group foaming agent in the same amount of bubbles,sand,cement,water to prepare the bubble mixed light soil test block.The test block prepared by mixing ion-non-ionic foaming agent bubble group with cementing material is not easy to break and has good stability.Under the condition of natural curing for 28 fills,the dry bulk density of ion-non-ionic foaming agent bubble mixed with light soil is 768.35kg/m~3,and the dry bulk density of control group is 1307.21kg/m~3.The dry bulk density of the test block in the control group is no longer in the category of bubble mixed light soil.The bubble mixed lightweight soil test block prepared by ion-non-ionic foaming agent in this paper has the performance of low bulk density and high strength.When the dry bulk density is768.35kg/m~3,the uniaxial compressive strength of the test block can reach 1.8MPa in28 d,and the performance of the test block is better than the standard value of JG/T266-2011 Foamed Concrete.Based on the concrete constitutive model,combined with ion and nonionic,general foam formulations of bubble mixed light soil mechanics experiment,the stress-strain curve obtained using coordinate dimensionless processing and compression of sectional curve equation theory,primarily established the bubble mixed light soil under uniaxial compression condition of piecewise function model equation. |
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