In this work, the effects of calcination temperatures ranging from 600°C to 1,000°C on changes in mineralogical phases and mechanical characteristics calcined impure kaolinite clay blended cement mortars were investigated. The impact calcining temperature pozzolanic activity was evaluated using direct indirect methods. findings demonstrated that at 700°C, changed a crystalline an amorphous metakaolin phase. Specific surface, water demand, setting time cements decreased as increased....

The recent emphasis on sustainable development in the construction industry has made it essential to develop and building materials that are not only affordable, but have minimal negative impact environment. This study investigates valorisation of steel slag, which is mostly considered be a waste material several parts world, by blending with calcined impure kaolinitic clay partially replace ordinary Portland cement (OPC) preparation self-compacting concrete (SCC). OPC was substituted slag...

Pervious concrete has been reported as a viable solution to reduce stormwater run-off, the heat-island effect, road noise, and pavement flooding. Previous researchers have focused on analysing structural properties functionality of pervious concrete. However, relatively few studies conducted into addition supplementary cementitious materials (SCMs), such calcined clay, in its effect long-term durability. This paper studied clay pozzolan partial substitute for Portland cement concrete,...

Recent studies have shown the viability of low-grade calcined clays as a partial substitute for cement in construction applications. However, there is limited information about performance clay withstanding chloride-rich environments. This paper investigates durability mortar prepared by partially substituting with clay. Naturally occurring having kaolinite content 17% was at 900 °C, blended and used to prepare composite samples containing up 40% weight Durability were conducted using rapid...

The availability of some supplementary cementitious materials, especially fly ash, is imminent concern in Europe due to the projected closure several coal-fired power generation plants. Pure kaolinitic clays, which arguably have potential replace are also scarce and expensive their use other industrial applications. This paper examines utilisation low-grade clays for construction purposes. clay sample was heat-treated at a temperature 800 °C evenly blended with Portland cement substitutions...

Availability of aluminosiliceous materials is essential for the production and promotion geopolymer concrete. Unlike fly ash, which can only be found in industrial regions, clays are available almost everywhere but have not received sufficient attention to their potential use as a precursor synthesis. This study investigates effectiveness calcined clay sole binary (with ash) preparation mortar. Fly ash-based containing between 0 100% low-grade was prepared investigate effect replacement on...

Calcined clay pozzolan has been used to replace varying portions of high alkali Portland limestone cement in order study its effect on the alkali-silica reaction (ASR). for had a total Na2Oeq 4.32. Mortar-bar expansion decreased as content increased. The highest was recorded reference bars with no pozzolan, reaching maximum 0.35% at 42 days whilst reduced by between 42.5% and 107.8% 14 9.4% 16.4% 84 increasing calcined content. Mortar 25% were least expansive recording less than 0.1% all...

Low-grade calcined clay, due to its low cost, availability and temperature calcination, has been gaining attention in recent times as a supplementary cementitious material (SCM) the manufacture of revolutionary building materials improve fresh hardened properties concrete. Silica fume, on other hand, used, over years, performance concrete reduced porosity improved transition zone quality. In spite individual contribution these two pozzolans strength durability concrete, there is knowledge...

Burnt clay pozzolana produced from a deposit at Mankranso in Ghana has been activated by mechanical means through roll milling and ball as well chemically the addition of 1% - 4% m/m Na2SO4. The sample was suitable with total SiO2 + Al2O3 Fe2O3 content ≥70% stipulated ASTM C 618 standard. particle sizes, surface characteristics specific areas obtained types/degrees were analyzed their effect on strength development Portland cement mortar cubes prepared samples evaluated. Compressive...

ABSTRACTPartially replacing cement with pozzolans, apart from the enormous technical benefits, has been reported as an effective approach to reducing greenhouse gases emanating production. Calcined clay and pulverised granite, in recent years, have experimented individually for their use filler or pozzolan concrete improve workability compressive strength. This research includes study of synergistic characteristics these two mineral admixtures influence on mechanical durability properties...

The high kaolinite content of metakaolin makes it valuable to other industries, thereby affecting its availability and affordability for the production limestone calcined clay cement (LC3). This work presents a study on potential utilization low-grade in place pure preparation LC3 mortar formulations. CEM I was partially substituted with by 20, 30, 40, 50 wt.%. weight ratio maintained at 2:1 all mixes water-to-binder 0.48. X-ray diffraction (XRD), thermogravimetric analysis (TGA), isothermal...

Calcined clay pozzolan, the major mineral admixture used in Ghana to partially substitute ordinary Portland cement has gained massive recognition local construction industry because of its technical advantages and affordability. The most prominent undesirable property associated with use calcined pozzolans is slow setting strength development, especially at early ages. This paper presents a study effect Na2SO4 on mechanical properties high volume pozzolan cements. cements containing 30 wt....

Supplementary cementitious materials (SCMs) have been used over the years to partially replace cement for concrete applications due their technical and, by extension, environmental benefits. In this work, effect of curing temperature (25 °C, 35 °C and 45 °C) on hydration characteristics mechanical properties paste incorporating low reactivity calcined clay was examined. CEM-I replaced with 20% weight clay. Isothermal calorimetry compressive strength studies were conducted blended mortar,...

A Quality control scheme was developed for a 200 ton per day commercial pozzolana plant. The evaluated the first 34 days of production. Statistical Process Control tech­niques were specifically applied to mechanical properties setting times and compressive strength. Results obtained showed that samples tested chemically suitable with total SiO2, Al2O3 Fe2O3 content ≥ 70%. Mechanical tests performed mostly under when out-of-control, they gave valuable indication plant malfunction or operator...