Fly Ash, The Composite Material To Add Aluminum Sulfate To The Impermeability Of Concrete

The concrete of summary is that consumption is the greatest in modern civil engineering, the most extensive basic construction material of use; Based on the ordinary concrete foundation, and based on the addition of mixed concrete information on the different functions and the principle of testing, to study the addition of fly ash as the main materials, aluminum sulfate as swelling ingredients mixed incorporation of ordinary concrete, The impermea bility of concrete impact.The results show that the addition of fly ash as a major information to increasing the group were added to the concrete, concrete-produced contraction However, the concrete structure and permeability properties will be improved. This is because it is with the hydration of cement in the process of formation of Ca(OH)2 for the second hydration reaction (pozzolanic reaction) continue with the formation and stability of cementitious properties of hydrated calcium silicate gel, with a corresponding lower rate of the concrete. Concrete structures and improve the impermeability of concrete because the incorporation increasing the component of fly ash, Since fly ash ash activity, It will cement hydration process in the formation of Ca(OH) 2 for the second hydration reaction Generation has gelled nature and stability of the hydrated calcium silicate gel, a useful addition to the number of hydration products, improve the interface of the concrete structure and pore structure, thereby increasing the density of concrete and permeability.Expansion of aluminum sulfate as a group were added to the concrete where the concrete has expansive performance, Aluminum sulfate is added to concrete. Cement and its reaction product formed ettringite structure of the cement for the expansion, thus forming the concrete volume has increased. This is because the calcium aluminate sulfur, gypsum and cement hydration formation of calcium hydroxide and the combination of ettringite formation, it can play a filling, cut capillary porous concrete joints and make big changes hole hole total porosity decreases, its impermeability of concrete has been improved.Fly ash, doped aluminum sulfate together in concrete, although early strength concrete benchmarks less than the strength of the concrete, But intensity upgrade faster, the late high intensity stability. This is due to the superposition of two "activation effectiveness" to improve the performance of micro-expansive concrete, Compensation played a role and contraction filling density, the concrete has good impermeability.The study also found that composite materials adding fly ash, aluminum sulfate, etc. also need to optimize content, Meanwhile multiple copies of the water-cement ratio tests also need a reasonable adjustment. By orthogonal experiment, further defined the new development of the impermeability of concrete, material optimization add content as follows : 20% fly ash, 11% aluminum sulfate, water-cement ratio 0.4, increasing the curing composition, expansive group were scientific and rational ratio, impermeability to enable compression to achieve the best. The experiment developed by the impermeability of concrete, engineering, its compressive strength and impermeability are designed to meet quality requirements and achieved good results.