Abstract
High titanium heavy slag is one kind of solid waste that exists in large amounts in the southwest of China. In this paper, this high titanium heavy slag is used as natural pre-wetted material in concrete because of its porous structure. Three kinds of aggregates are used in this concrete. The first one is natural limestone and river sand. The second one is dry slag fine aggregate and coarse aggregate. The third one is pre-wetted coarse slag aggregate and dry slag fine aggregate. The strength, dry shrinkage, autogenous shrinkage, relative humidity, pore size distribution, stress–strain relationship, micro-hardness and chloride penetration of concrete composed of the above three aggregates are tested in this study. The results show that pre-wetted slag aggregate is a suitable internal curing material. The concrete with pre-wetted slag aggregate shows higher strength, lower shrinkage and smaller porosity. The water absorbed in the slag aggregate can be released effectively to increase the relative humidity, accelerate hydration, improve porosity and increase the interface strength.
Highlights
High titanium heavy slag is the solid waste product after smelting vanadium titanium magnetite, which exists in large quantities in Guizhou Province in China
The study results show that the dry shrinkage declines and the pore size decreases by using shrinkage-reducing admixtures
For the concrete with slag aggregate, (a)the cracks spread through the aggregate, which illustrated that the strength of the ITZ in the CSAC and wetted slag aggregate concrete (WSAC) samples was improved
Summary
High titanium heavy slag is the solid waste product after smelting vanadium titanium magnetite, which exists in large quantities in Guizhou Province in China. The strength of the sample would decrease when the concrete is composed of a great deal of lightweight aggregate [15,16,17,18,19] This method is not suitable for casting high-strength concrete. High titanium heavy slag is a natural porous aggregate, and its mechanical. High titanium heavy slag is a natural porous aggregate, and its mechanical properties are similar to natural gravel. If it can be used as internal curing material, it can noptronpleyrtiimesparroevesimthielavrotloumnaetudreaflogrmraavteiol.nIof fitccoanncrbeeteubsuedt aalsoinnteortnianlcrceuarsiengthme actoesrtiaolf, it cocnacnrenteo.t Tohnelyreifmorper,oivneththisepvaopluemr, ethdeeffeoarsmibaitliotynoofftchoins cprreoteblbeumt aislsdoisncoutsisnecdr.ease the cost of concrete. Research Significance High titanium heavy slag is solid waste with no harmful components. MIP In order to analyze the porosity of samples, the specimens curing for 120 d are subjected to measurements of pore volume and pore size distribution using intrusion porosimetery (MIP, Auto Pore 9510, Poremaster gt-60, quantachrome, USA)
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