Cellular concrete with variable density from Vietnam raw materials

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The existing methods of obtaining cellular concrete products with a variatropic structure are analyzed. It is revealed that each of them has its own advantages and disadvantages. A new technology for the production of cellular concretes of variable density has been developed, which makes it possible to manufacture construction products in Vietnam from local raw materials with high performance characteristics and meeting modern requirements for energy efficiency and durability.According to the test results, it was found that at the hardening age of 28 days, the average density in the dry state and in the state of normal humidity is in the range of 1085–1608 and 960–1517 kg/m3, respectively. Strength tests have shown that the developed concrete reaches an average compressive strength of 13.5–25.4 MPa on the 28th day of hardening. It can be concluded that the combination of foam and gas-forming components used in the formulation made it possible to obtain cellular concrete with an anisotropic structure, having the required indicators of compressive strength and average density in a wet state, which will be in demand in Vietnam during the construction of facilities for various purposes.

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作者简介

Tang Van Lam

Hanoi University of Mining and Geology

编辑信件的主要联系方式.
Email: tangvanlam@humg.edu.vn

Candidate of Sciences (Engineering), Lecturer-Researcher 

越南, 18, Pho Vien, Duc Thang, Bac Tu Liem, Hanoi

Pham Duc Luong

Hanoi University of Mining and Geology

Email: luong100x@gmail.com

Master 

越南, 18, Pho Vien, Duc Thang, Bac Tu Liem, Hanoi

Vo Dinh Trong

Hanoi University of Mining and Geology

Email: vodinhtrong2611@gmail.com

Student 

越南, 18, Pho Vien, Duc Thang, Bac Tu Liem, Hanoi

B. Bulgakov

National Research Moscow State University of Civil Engineering

Email: BulgakovBI@mgsu.ru

Candidate of Sciences (Engineering), Associate Professor 

俄罗斯联邦, 26, Yaroslavskoe Highway, Moscow, 129337

S. Bazhenova

National Research Moscow State University of Civil Engineering

Email: BazhenovaSI@mgsu.ru

Candidate of Sciences (Engineering), Associate Professor 

俄罗斯联邦, 26, Yaroslavskoe Highway, Moscow, 129337

参考

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2. Fig. 1. Variatropic structure of cellular concrete

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3. Fig. 2. Exit of the laid foam concrete mixture beyond the boundaries of the molds as a result of the continuing increase in the volume of foam mass, leading to a decrease in the quality of the foam concrete

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4. Fig. 3. The mold-filling coefficient – Kf

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5. Fig. 4. Perforated form for obtaining cellular concrete with variable density

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6. Fig. 5. Cube samples 150×150×150 mm in size from cellular concrete and their internal structure of variable density, which is visible on the cross-section

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7. Fig. 6. Fly ash from the Vung Ang thermal power plant (а); blast furnace slag from the Hoa Phat metallurgical plant (b) and TOTO ceramic powder (c)

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8. Fig. 7. Aluminum powder

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9. Fig. 8. Foaming agent EABASSOC

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10. Fig. 9. Cube samples with a size of 70×70×70 mm, sawn from the outer and inner layers of cellular concrete cube samples with a size of 150××150 mm

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11. Fig. 10. Surfaces of cellular concrete samples destroyed as a result of strength tests: а – surface of the destroyed sample of cellular concrete; b – surface of the destroyed sample of aerated concrete on Portland cement

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12. Fig. 11. Dependence of compressive strength of cellular concrete samples on hardening time: ■ – in the outer layer; ■ – in the inner layer

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