Abstract
In this paper, the effect of a newly developed superfine basalt powder (SB) on the fresh and mechanical properties of cement paste was studied. The concept of water film thickness (WFT) was cited to explain the influence of SB on fresh and mechanical properties and related mathematical model formulas were established. In addition, the relationship between the fresh properties and mechanical properties of paste was also explored. The results indicated that SB can improve the segregation resistance and cohesiveness. The maximum improvement rate relative to the control cement paste was 75.4% and 50.4%, respectively. The 5% SB and 10% SB reduced the fluidity in the range of 4.1–68.7% but increased the early and late compressive strength in the range of 1.2–25.7% compared to control cement paste under different water/cementitious materials (W/CM) ratios. However, the influence of 20% SB on fluidity and compressive strength was opposite to the above behavior, and the increase rate and decrease rate were 1.8–11.8% and 1.1–13.9% respectively. The WFT was the most important factor that determined the compressive strength, rheological parameters, and flow parameters of paste containing SB, while the substitute content of SB and WFT together determined the bleeding rate and cohesiveness. Among them, the correlation between bleeding rate and WFT increased with time. The empirical mathematical models between WFT, fresh properties, and compressive strength were established and verified by other mineral admixtures, which were successfully extended and applied to the entire field of cement-based materials.
Highlights
IntroductionCement has become the most common building material in engineering with the increasing global demand for construction, but the manufacturing process of cement causes serious environmental pollution and energy consumption [1,2,3]
The results showed that the packing density and void ratio of cement paste increased and decreased with increasing superfine basalt powder (SB) substitutions, respectively
The results indicated that the effect of SB on the fluidity of cement paste was greatly affected by the water/cementitious materials (W/CM) ratio
Summary
Cement has become the most common building material in engineering with the increasing global demand for construction, but the manufacturing process of cement causes serious environmental pollution and energy consumption [1,2,3]. The development of green supplementary cementitious materials has been the focus of research in the field of cementitious materials, which can improve the performance of mixtures while saving costs and protecting the environment [4,5]. Some supplementary cementitious materials (SCM), such as silica powder, fly ash, zeolite, and limestone powder, have been used to substitute part of cement, but it is far from meeting the actual requirements of engineering applications [6,7,8,9,10]. It is a meaningful and promising topic to develop new green supplementary cementitious materials in the field of engineering construction
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