espanolLos muros del primer nivel de las edificaciones presentan frecuentementeproblemas de humedad como consecuencia de la exposicion a la lluviay la absorcion de agua del suelo de los bloques de sobrecimiento. Infortunadamente,los bloques de concreto convencionales, adquiridos en elmercado, usados como sobrecimiento, tienen coeficientes de absorcioncapilar altos y resistencias a la penetracion de agua bajas.En esta investigacion, se produjeron y analizaron experimentalmentebloques y probetas cilindricas, se fabricaron con arena de concreto lavada,cemento Portland tipo 1, emulsion asfaltica en frio y una relacionagua-cemento de 0,40 en peso. Se estudiaron bloques y cilindros sinadicion de emulsion asfaltica y con 10%, 20%, 30% y 40% de adicionde emulsion asfaltica respecto al peso del cemento. Se ejecutaron ensayosde absorcion capilar, de resistencia a la penetracion de agua y deresistencia a la compresion y se realizo un analisis comparativo de losresultados obtenidos para determinar la proporcion optima de adicionde emulsion asfaltica.Se determino que los bloques con emulsion asfaltica presentan mejorespropiedades que los bloques convencionales sin aditivos y que podrianreducir los problemas de humedad en los muros pues tienen un coeficientede absorcion capilar bajo. EnglishThe walls of the first level of the building often exhibit moisture problemsas a result of exposure to rain and water absorption in the soil by thefoundation wall. Unfortunately, conventional concrete blocks, purchasedon the market and used as foundation wall, have a high coefficientof capillary suction and a low resistance to water penetration. In thisresearch, concrete blocks and cylinders were produced and analyzedexperimentally. They were manufactured with washed concrete sand,type I Portland cement, cold bitumen emulsion and a 0,40 water-tocement(w/c) ratio by weight. Blocks and cylinders were analyzed firstwithout the addition of bitumen emulsion and then with the addition of10 %, 20 %, 30 % and 40 % of bitumen emulsion by weight of the cement.Capillary water absorption test, resistance to water penetration test andcompressive strength test were completed. A comparative analysis ofthe results was performed in order to determine the optimum additionof bitumen emulsion. It was determined that the blocks with bitumenemulsion have better properties than conventional blocks withoutadditives. Furthermore, it was concluded that the blocks with coldbitumen emulsion reduce moisture problems in the walls since theseblocks have a low coefficient of capillary suction.