Wt% of aragonite, a CaCO(3) polymorph, increased with higher hydraulic activity ( degrees C) of limestone in precipitated calcium carbonate (PCC) from the lime-soda process (Ca(OH)(2)-NaOH-Na(2)CO(3)). Only calcite, the most stable polymorph, was crystallized at hydraulic activity under 10 degrees C, whereas aragonite also started to crystallize over 10 degrees C. The crystallization of PCC is ...

Abstract. Geopolymers are inorganic and versatile alternative binder. They exist in a wide range, varying from material which behaves like mortars to with properties ceramics. This makes them potentially innovative repair mortars. In this research the activation of metakaolin-based geopolymers is explored context stone conservation. A set reactivity tests performed evaluate activators compatibi...

The current trend in the development of self-compacting concrete with sustainable construction materials has served as a guide to design novel concrete, siderurgical by-products (steel slag aggregates and cupola powder supplementary cementing material) that also meets demands high-performance concrete. This research sets out clarify unknown behavior its durability, which is ability withstand an...

Sanliurfa limestone is becoming increasingly popular for both interior and exterior building applications in the local area in south east Turkey, being easy to cut and shape and suitable for many purposes. Although these limestones are low cost construction materials, they are not widely used elsewhere due to the lack of data regarding their chemical, physico-thermal and mechanical properties a...

This paper attempts to analyze the effect of mineral powder on adhesion aggregates and asphalt. First, it employs gravimetric method quantitatively peeling rate asphalt mortar from surface basalt, andesite, limestone aggregates. Then, takes microscopic pictures adhered observe distribution in mixtures, uses profiles status At last, this analyzes particles surface/interface asphalt, results indi...

in this study, the effects of particle size distribution improvement and dense packing techniques on the 28- and 90-day compressive strengths of class g oil well cement have been investigated. it was observed that limited improvements in the particle size distribution of cement (regarding industrial possibilities) cannot result in a significant increase in 28- and 90-day compressive strengths. ...

Studies on actinobacterial diversity in limestone habitats are scarce. This paper reports profiling of actinobacteria isolated from Hundung limestone samples in Manipur, India using ARDRA as the molecular tool for preliminary classification. A total of 137 actinobacteria were clustered into 31 phylotypic groups based on the ARDRA pattern generated and representative of each group was subjected ...

The multiscale rheological threshold theory can guide the mix design of self-compacting concrete (SCC) from a trans-scale view. Through paste thresholds calculated by mini-slump flow test results, workability SCC be predicted. However, this method shows insufficient prediction accuracy when handling multiplexed powder. In existing calculation formula, characteristics powder materials were descr...

This research was carried out to evaluate the relationship between incorporation of calcite precipitation bacteria, sporosarcina pasteurii using calcium lactate as nutrient source and properties calcined clay limestone powder blended self-compacting concrete. Ten mixes were designed designated S0 S9 with control (without bacteria nutrient) S1 at varying concentrations effect cell density concen...

Mortars intended for plastering and masonry works normally comply to EN 413-1 and/or ASTM C91 specifications. This paper seeks assess the suitability of geopolymers (GPs) composed metakaolin seashell wastes applications. The sodium hydroxide silicate activators contained air-entraining molecules secure about 10% ± 2% air content. Just like cement-based mortars, test results showed that mechanic...