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Strength improvement additives for cement bitumen emulsion mixture
Highlights Effect of water content on the indirect tensile strength and air void content of CBEM is studied. The microstructure of CBE paste and the interface between CBE paste and aggregate are studied. The deficiency in strength about CBEM is discussed through analyzing the microstructure of CBEM. Superplasticizer and JFC are proposed to increase the indirect tensile strength of CBEM.
Abstract To increase the strength of cement bitumen emulsion mixture (CBEM), the effect of water and cement content on the volumetric properties and strength of CBEM was firstly studied to find the deficiency in strength about CBEM, and then two additives were added to overcome this deficiency. Results indicates that CBEM at maximum indirect tensile strength (ITS) has much lower water content than that at minimum air void content. This is because the strength of CBEM is not only dependent on the air void content of CBEM, but also it is related to the microstructure of cement bitumen emulsion (CBE) paste and the interface between CBE paste and aggregate. Low water content can help to form a dense microstructure of CBE paste, which is beneficial to the strength of CBEM. However, CBE paste has a poor bonding interface with aggregate at low water content, and the air void content of CBEM is relative high in this condition. The addition of superplasticizer and wetting agent (JFC, a fatty alcohol–polyoxyethylene ether) can efficiently overcome the two deficiencies of CBEM and greatly increase the strength of CBEM. The air void content of CBEM at low water content can be decreased by adding superplasticizer and JFC. Meanwhile, superplasticizer and JFC can improve the wetting ability of fresh CBE paste, thus the coating state of aggregate with fresh CBE paste and the bonding interface between hardened CBE paste and aggregate are greatly improved. Accordingly, the failure surface of CBEM is changed from “adhesive failure” to “cohesive failure” and “fine aggregate fracture” after adding superplasticizer and JFC. The maximum ITS can increase by 21.5% and 29.1% for CBEM with superplasticizer and CBEM with superplasticizer and JFC, respectively.
Strength improvement additives for cement bitumen emulsion mixture
Highlights Effect of water content on the indirect tensile strength and air void content of CBEM is studied. The microstructure of CBE paste and the interface between CBE paste and aggregate are studied. The deficiency in strength about CBEM is discussed through analyzing the microstructure of CBEM. Superplasticizer and JFC are proposed to increase the indirect tensile strength of CBEM.
Abstract To increase the strength of cement bitumen emulsion mixture (CBEM), the effect of water and cement content on the volumetric properties and strength of CBEM was firstly studied to find the deficiency in strength about CBEM, and then two additives were added to overcome this deficiency. Results indicates that CBEM at maximum indirect tensile strength (ITS) has much lower water content than that at minimum air void content. This is because the strength of CBEM is not only dependent on the air void content of CBEM, but also it is related to the microstructure of cement bitumen emulsion (CBE) paste and the interface between CBE paste and aggregate. Low water content can help to form a dense microstructure of CBE paste, which is beneficial to the strength of CBEM. However, CBE paste has a poor bonding interface with aggregate at low water content, and the air void content of CBEM is relative high in this condition. The addition of superplasticizer and wetting agent (JFC, a fatty alcohol–polyoxyethylene ether) can efficiently overcome the two deficiencies of CBEM and greatly increase the strength of CBEM. The air void content of CBEM at low water content can be decreased by adding superplasticizer and JFC. Meanwhile, superplasticizer and JFC can improve the wetting ability of fresh CBE paste, thus the coating state of aggregate with fresh CBE paste and the bonding interface between hardened CBE paste and aggregate are greatly improved. Accordingly, the failure surface of CBEM is changed from “adhesive failure” to “cohesive failure” and “fine aggregate fracture” after adding superplasticizer and JFC. The maximum ITS can increase by 21.5% and 29.1% for CBEM with superplasticizer and CBEM with superplasticizer and JFC, respectively.
Strength improvement additives for cement bitumen emulsion mixture
Ouyang, Jian (author) / Hu, Lijun (author) / Yang, Wenting (author) / Han, Baoguo (author)
Construction and Building Materials ; 198 ; 456-464
2018-11-29
9 pages
Article (Journal)
Electronic Resource
English
Strength improvement additives for cement bitumen emulsion mixture
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