APPLICATION OF PVA-BF HYBRID FIBER CONCRETE IN MASS CONCRETE ENGINEERING
In order to address quality defects of mass concrete,such as a lot of hydration heat and low crack resistance,and improve the comprehensive application of mass concrete,the impact of PVA-BF hybrid fibers on the flowing properties,mechanical properties,hydration heat properties and crack resistance of concrete and the engineering adaptability of concrete were studied by single factor experiments and engineering applications.Results have shown that:(1)with the PVA-BF hybrid fiber content increasing,the concrete slump first increased and then decreased;the 3d compressive strength first decreased and then increased;and the 28d compressive strength first increased and then decreased,which reaches the maximum(53.65 MPa)when the PVA-BF hybrid fiber content was 0.45%;(2)if PVA-BF hybrid fibers were added,the amount of hydration heat of concrete decreased after one day,which reached the minimum when the PVA-BF hybrid fiber content was 0.15%;(3)with the PVA-BF hybrid fiber content increasing,the maximum crack length first decreased and then increased,which decreased by 15.2%to the minimum(462 mm)when the PVA-BF hybrid fiber content was0.45%;and the maximum crack width first decreased and then increased,which decreased by 49.8%to the minimum(0.16 mm)when the PVA-BF hybrid fiber content was0.45%.Accordingly,PVA-BF hybrid fibers are conducive to the comprehensive performance of mass concrete in foundation engineering.That is,they are of high application value for promotion.
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