Experimental Study on Modification of Concrete with Asphalt Admixture

World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium - WMCAUS

土木建筑工程

Boltryk, Michal^1 ; Malaszkiewicz, Dorota^1 ; Pawluczuk, Edyta^1

Bialystok University of Technology, Wiejska Str. 45E, Bialystok

15-351, Poland^1

关键词: Aggressive environment;    Carbonation resistance;    Chemical and mechanical modifications;    Chloride ion penetration;    Engineering structures;    Freeze-thaw resistance;    High strength concretes;    Hydraulic engineering construction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/245/2/022024/pdf
DOI  :  10.1088/1757-899X/245/2/022024

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Durability of engineering structures made of cement concrete with high compressive strength is a very vital issue, especially when they are exposed to different aggressive environments and dynamic loads. Concrete resistance to weathering actions and chemical attack can be improved by combined chemical and mechanical modification of concrete microstructure. Asphalt admixture in the form of asphalt paste (AP) was used for chemical modification of cement composite microstructure. Concrete structure was formed using special technology of compaction. A stand for vibro-vibropressing with regulated vibrator force and pressing force was developed. The following properties of the modified concrete were tested: compressive strength, water absorption, freeze-thaw resistance, scaling resistance in the presence of de-icing agents, chloride migration, resistance to CO2and corrosion in aggressive solutions. Corrosion resistance was tested alternately in 1.8% solutions of NH4Cl, MgSO4, (NH2)2CO and CaCl2, which were altered every 7 days; the experiment lasted 9.5 months. Optimum compaction parameters in semi-industrial conditions were determined: ratio between piston stress (Qp) and external top vibrator force (Po) in the range 0.4÷-0.5; external top vibrator force 4 kN. High strength concretes with compressive strength fcm= 60÷70 MPa, very low water absorption (