the compositions of gas and foam concrete with improved acoustic characteristics were developed. The optimal form of porosity, which contributes to the absorption of sound waves, both in the range of audible frequencies and at infrasonic and ultrasonic frequencies, is revealed. The mathematical model for designing sound-absorbing concrete was improved, taking into account both the porosity of the composite and the influence of the porous aggregate. The laws of synthesis of aerated concrete and foam concrete are established, which consist in optimizing the processes of structure formation due to the use of a polymineral cement-ash binder and blowing agent. The composition of the composite intensifies the process of hydration of the system, which leads to the synthesis of a polymineral heterodisperse matrix with an open porosity of more than 60%. Peculiarities of the influence of the “Portland cement – aluminosilicate – complex of modifiers” system on the rheology of the concrete mixture was identified, which can significantly reduce shear stress and create easily formed cellular concrete mixtures. The increased activity and granulometry of aluminosilicates predetermine an increase in the number of contacts and mechanical adhesion between particles during compaction, strengthening the frame of inter-pore septa. The mechanism of the influence of the composition of the concrete mixture on the microstructure of the composite is established. The presence of refined aluminosilicates and a complex of additives in the system along with cement contribute to the synthesis of the matrix with open porosity, thereby increasing the sound absorption coefficient.
Perubahan sifat mekanis tanah dengan nilai plastisitas tinggi yang distabilisasi menggunakan difa soil stabilizer yang diparameterkan melalui nilai – nilai kuat geser tanah (tegangan tanah,cohesi tanah, sudut geser tanah) serta tingkat kepadatan tanah (berat isi tanah maksimum dan kadar air optimum) terhadap penurunan massa tanah.Stabilisasi mekanis atau stabilisasi mekanikal dilakukan dengan mencampur atau mengaduk dua macam tanah atau lebih yang bergradasi berbeda untuk memperoleh material yang memenuhi syarat yang telah ditentukan komposisi tambahannya. Bahan bahan adiktif adalah hasil olahan pabrik yang bila ditambahkan kedalam tanah dengan perbandingan yang telah ditentukan akan memperbaiki sifat – sifat teknis tanah. Seperti, kekuatan, tekstur, kemudahan dikerjakan (workability) dan plastisitas. Contoh – contoh bahan tambahan adalah : kapur, semen ,abu terbang, limbah sawit, garam dapur, difa soil stabilizer dan aspal.Soil stabilization adalah metode perbaikan tanah untuk dapat memenuhi spesifikasi teknis material dalam aplikasi teknik stabilisasi tanah dapat dilakukan secara mekanis dan kimiawi. Stabilisasi secara mekanis adalah dengan memperbaiki sifat tanah secara fisik, biasanya dilakukan dengan mengurangi volume rongga udara pada kadar air yang optimum saat pemadatan (compaction) dilakukan. Sedangkan stabilisasi secara kimiawi dilakukan dengan memperbaiki gaya ikatan secara mikro antara butir tanah dan bahan pembantu yaitu difa soil stabilizer.
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