A NEW TECHNOLOGY FOR AIR-ENTRAINMENT OF CONCRETE
This paper describes a new technology for air-entrainment of concrete. The technology isbased on the addition of dry superabsorbent polymers (SAP) to the concrete. A large amountof small internal water reservoirs are formed during mixing when SAP absorbs water andswells. The internal water reservoirs are distributed throughout the concrete. During thehydration process the cement paste imbibes water from the water-filled SAP voids. Therebythe water-filled SAP voids turn into partly air-filled voids. The advantages of the SAP-based technology compared to traditional chemical air-entrainment include stability of the air void system and improved control of both the amountof added air and the air void size. The new technology based on SAP has been tested in freeze-thaw experiments, where theamount of surface scaling was measured. The results clearly show that SAP is beneficial forfrost protection of concrete. The amount of scaled material is reduced, when the SAP additionis increased. Furthermore, the results indicate that the amount of scaled material primarilydepends on the volume of SAP voids in the concrete.
S.Laustsen M.T.Hashoit O.M.Jensen
Department of Civil Engineering,Technical University of Denmark,Denmark Division of Bridge,Tunnel and Marine Structures,COWl,Denmark
国际会议
南京
英文
1223-1230
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）