Study On The Performance And Application Of Biological Glue

Biological glue with advantages of renewable rich sources, low-cost, pollution-free, andso on, is attracting more and more attention. However, as a foaming agent for lightweightmaterial, it is seldom reported to use it in preparing foam concrete of low-cost and efficient.In this thesis, the author studied the basic performance of the carrageenan/agar, their gelproperties and cohesiveness under different conditions; and used the gel as foaming agents indeveloping a casting or painting foam concrete material from portland cement as the mainaggregate with an appropriate amount of acrylic emulsion and glass fiber. This material hadthe advantages of high quality and low price, convenient to construct and safety in application.And then, the performance of the foam concrete was tested. Measured parameters includeddry density, compressive strength, water absorption, pore structure and etc. Finally, the effectsof the water-cement ratio, the amount of foam, the amount of acrylic emulsion and glass fibervolume ratio on the performance of foam concrete were analyzed.The results showed that the basic performance of the biological glue was in line withnational standards. By testing the biological glue’s gel performance and cohesiveness,sequence of influencing factors was found as: concentration, ionic strength, and pH value.The sequence of the agar was: concentration, pH value, ionic strength. The best formulationand process of preparing carrageenan gel was: concentration2%+pH value7; and the bestformulation process of preparing agar gel was: concentration2%+pH value5+Mg2+concentration0.8mol/L(or Ca2+concentration0.4mol/L). With increasing of thewater-cement ratio from0.3to0.6, the amount of foam concrete’s pores, average pore sizeand porosity, was increased, the pore size was improved, the dry density and compressivestrength was decreased, water absorption increased. To increase the amount of foam canincrease the pores in the foam concrete and water absorption, and reduce hole clearance, drydensity and compressive strength. To increase the amount of silicone acrylic emulsion canmake the foam concrete pores and water absorption from decrease to increase. However, thedry density and compressive strength were just the opposite. To increase the amount of glassfiber, not only helped to reduce the foam concrete’s average pore size and porosity, to increasethe number of stomata, and to improve aperture, but also helped to increase the stability of thefoam concrete to avoid collapse phenomenon. At the same time, it can also reduce the drybulk density and compressive strength of foam concrete, and increase the water absorption.