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Development and engineering application of a new type of green switch air entraining agent for wet shotcrete

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Document pages: 9 pages

Abstract: Air entraining agent (AEA) can introduce a large number of micro bubbles into fresh concrete to improve its fluidity; However, high fluidity has an adverse effect on the spraying performance of wet mixed shotcrete. In order to solve this contradiction, a new type of green switch air entraining agent (gsae) is developed in this paper. The air entraining agent can improve the pumping and injection performance at the same time. The single mixing and combination tests were carried out by deer agitator and automatic tensiometer, including foaming capacity and surface tension. The new AEA consists of two components a and B. A was prepared from Sapindus (s-1), dodecyl trimethylammonium chloride (1231) and polyacrylamide. B was prepared from sodium dodecyl sulfate (K12) and silicone oil. The mass mix proportion is S-1  :   1231  :   polyacrylateide : K12 : silicone oil = 1 : 0.33 : 0.2 : 0.33 : 0.47. The application method of GSAE proposed that A was premixed with fresh concrete and then B was added at nozzle. Experimental investigation showed that the optimal mixing amount of GSAE was 0.1 –0.2 relative to cement. All performance measured of wet-mix shotcrete with 0.12 GSAE met the first-grade product requirements of the China National Standard. Compared with the conventional type of AEA, the proposed GSAE is capable of effectively improving pumpability and shootability.

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