Optimizing conditions for waterproofing to mix design RCC dams

Abstract

    Mix design RCC of two types concrete M20B6R90 and M15B2R90 use two types of cement PC40 Hoang Mai and PC40 Kim Dinh; mineral additives Puzolan Elephant Mountain - Son Tinh district - IDICO; Puzolan Phong My, Pha Lai fly ash; additives prolong setting-time: TM25 its Sika, LK-SR of Vietnam Institute for Building Science and Technology (IBST); water reducing admixture: Sikament R2000AT (N) from Sika. Gradation selection by optimizing the conditions for waterproofing. Experimental results achieved grade waterproofing and concrete compressive strength design requirements. When using cement Kim Dinh, R90 of concrete compressive strength reached 31.0 ÷ 33.8 MPa for RCC M20B6R90 and reached 17.9 ÷ 19.4 MPa for RCC M15B2R90. The substitution by Hoang Mai cement PC40, the results do not change significantly: the concrete compressive strength of RCC M20B6R90 reached 30.5÷32.9 MPa and RCC M15B2R90 reached 17.7 ÷ 18.7 MPa.