혼화재료를 치환한 시멘트 계열 재료에 대한 저점도형 고성능 감수제의 유동 성능 평가

Fluidity Performance Evaluation of Low Viscosity Typed Superplasticizer for Cement-Based Materials Incorporating Supplementary Cementitious Materials

Abstract

본 연구의 목적은 저점도형 고성능 감수제가 혼화재료를 포함하는 시멘트 계열 재료의 유동성 및 레올로지 특성에 미치는 영향을 분석하여 기초적인 정보를 제공하는 것이다. 이에 플라이애시, 고로슬래그, 실리카흄을 치환한 시멘트 페이스트와 모르타르에 대하여 일반적인 고성능 감수제와 저점도형 고성능 감수제를 사용하여 실험을 실시하였다. 실험 결과 저점도형 고성능 감수제는 소성점도에 있어서 일반형 고성능 감수제보다 크게 저감시키는 것으로 나타났다. 이러한 결과를 바탕으로 본 연구가 향후 저점도형 고성능 감수제를 사용하는 데에 기초적인 데이터를 제공할 것으로 기대한다.

The aim of the research is to provide a fundamental data of low viscosity typed superplasticizer (SP) on cement-based materials incorporating various supplementary cementitious materials (SCMs). As a relatively new product, low-viscosity typed SP has introduced for high performance concrete with high viscosity due to its high solid volume fraction with various SCMs. However, there are not enough research or reports on the performance of the low viscosity typed SP with cement-based materials incorporting SCMs. hence, in this research, for cement paste and mortar, fluidity and rheological properties were evaluated when the mixtures contained various SCMs such as fly ash, blast furnace slag, and silica fume. From the experiment conducted, it was checked that the low viscosity typed superplasticizer decreased the plastic viscosity of the mixture as well as the yield stress. From the results of this research, it is expected to contribute on introduction of new type SP for high performance concrete or high-viscous cementitious materials.

Figure 1. Applied shear rate protocol for flow curve

Figure 2. Dimension of channel flow apparatus

Figure 3. Influence of admixture dosage on flow depending on different types of superplasticizer

Figure 4. Influence of admixture dosage on yield stress depending on different types of superplasticizer

Figure 5. Influence of admixture dosage on plastic viscosity depending on different types of superplasticizer

Figure 6. Influence of admixture dosage on flow depending on different types of superplasticizer

Figure 7. Influence of admixture dosage on yield stress depending on different types of superplasticizer

Figure 8. Influence of admixture dosage on plastic viscosity depending on different types of superplasticizer

Figure 9. Influence of admixture dosage on relative viscosity reduction comparing with yield stress reduction (for mixtures incorporating silica fume)

Table 1. Experimental plan for low viscosity typed superplasticizer performance without SCMs (Step 1)

Table 2. Experimental plan for low viscosity typed superplasticizer performance with SCMs (Step 2)

Table 3. Physical properties of superplasticizer

Table 4. Coefficients for the correlating model