Relative Efects of Ca-Polystyrene Sulfonate and Na-Sulphonate-Based Superplasticizers on Properties of Flowing Concrete

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Title: Relative Efects of Ca-Polystyrene Sulfonate and Na-Sulphonate-Based Superplasticizers on Properties of Flowing Concrete

Author(s): Y. Sekiguchi, T. Okada, and T. Ukigai

Publication: Special Publication

Volume: 119

Issue:

Appears on pages(s): 157-170

Keywords: air entrainment; alkali-aggregate reactions; bleeding (concrete); calcium; compressive strength; concretes; naphthalene; plasticizers; polystyrene; setting (hardening); sodium; sulfonate; workability; Materials Research

Date: 9/1/1989

Abstract:
Effects of calcium polystyrene sulfonate-based superplasticizer (SP.PSS-Ca) and sodium b-naphthalene sulfonate-based superplasticizer (SP.NSF-Na) on concrete behavior were studied. The SP.PSS-Ca does not contain sodium and potassium (Na, K), the cause of alkali-aggregate reaction, and hence is less harmful than SP.NSF-Na. SP.PSS-Ca gave a larger increase of slump, smaller increase of air content, smaller air loss, and slump loss than SP.NSF-Na at the same dosage. The dosage of SP.PSS-Ca was 70 percent of that required for SP.NSF-Na to obtain the required slump. SP.PSS-Ca did not increase the air content to flowing concrete of base concrete, but SP.NSF-Na increased it. SP.PSS-Ca showed lower air loss and slump loss (0.6 percent, 3.5 cm/90 min) than SP.NSF-Na (2.0 percent, 7.0 cm/90 min). Other properties such as bleeding, setting time, and compressive strength were similar with SP.PSS-Ca and SP.NSF-Na. Thus SP.PSS-Ca can be considered to have better properties as a superplasticizer than SP.NSF-Na.