chemical products for use in the construction industry, namely, chemical concrete and mortar admixtures, namely, chemical additives for use in producing and entraining air filled pores in concrete, admixtures in delaying and accelerating the setting of concrete, and bonding preservatives and agents for concrete and dispersion chemical agents for aqueous suspensions of solid materials; chemical agents for liquefying, plasticizing, sealing, and stabilizing concrete; chemical agents for enhancin...