高炉スラグ（BFS）高含有セメントの強度発現性は、セメント（OPC）の配合量によって大きく変化することが知られる。本研究では、セメントの配合量を変えたBFS高含有セメントについて、その強度発現性に及ぼすせっこう（Gyp）と亜硝酸カルシウム（CN）の併用効果を検討した。その結果、OPC1～3％でGyp15％＋CN2％添加、およびOPC30～50％でGyp1％＋CN2％添加としたBFS高含有セメントが、OPCや高炉セメントB種と同等以上の強度を得られることがわかった。また、OPC配合量でGypとCNの強度増進効果が異なるため、これらの最適化によるBFS高含有セメントの強度制御の方向性を提案することができた。

In this paper attempts have been done to create a mortar with relatively high uniaxial compressive strength (UCS), easy casting, high flexibility, instant hardening, low cost and easy availability. The main use of this material is to physically model the mechanical behavior of jointed rock-like blocks. The effect of four parameters such as joint roughness coefficient (JRC), bridge length (L), b...

Early-age cracking continues to be a significant problem for new concrete construction. Two of the major contributors to such cracking are the heat released by cement hydration during the first few days of curing and the autogenous shrinkage that often occurs during the same timeframe. In this paper, three potential alternatives for reducing these contributions by modifying the concrete mixture...

At present, sustainability is of major importance in the cement industry, and the use of additions such as silica fume as clinker replacement contributes towards that goal. Special foundations, and particularly micropiles, are one of the most suitable areas for the use of sustainable cements. The aim of this research is to analyse the effects in the very long-term (for 600 days) produced by sul...

Adjustment of superplasticizer (SP) dosage is one of the main factors in proportioning of self-compacting concrete (SCC) mixtures. The quantity of SP has to be within certain limits to avoid segregation or bleeding, which otherwise could alter the microstructure of concrete and affect its performance in the longer-term. Since SCC is produced with high cement content, some issues, such as high c...

Ground granulated blast furnace slag is widely used as a mineral admixture to replace partial Portland cement in the concrete industry. As the amount of slag increases, the late-age compressive strength of concrete mixtures increases. However, after an optimum point, any further increase in slag does not improve the late-age compressive strength. This optimum replacement ratio of slag is a cruc...

This study investigates the influence of curing age and mix proportions on the compressive strength of volcanic ash (VA) blended cement laterized concrete. A total of 288 cubes of 100mm dimensions were cast and cured in water for 3, 7, 28, 56, 90 and 120 days of hydration with cement replacement by VA and sand replacement by laterite both ranging from 0 to 30% respectively while a control mix o...

Influence of hardened cement paste content on the water absorption of fine recycled concrete aggregates Zengfeng Zhao a b , Sébastien Remond a b , Denis Damidot a b & Weiya Xu c a Université Lille Nord de France , Lille , France b Civil and Environmental Engineering Department , Mines Douai, LGCgE GCE , Douai , France c Geotechnical Research Institute , Hohai University , Nanjing , China Publis...

A commercial acrylic bone cement was modified by the incorporation of different weight fractions of glass spheres. The influence of the filler proportion on the mechanical behavior was assessed. Composite cements were prepared by replacing part of the powder phase of the cement by an equivalent weight of glass particles, which resulted in an increase in the liquid-to-powder (L/P) ratio of the p...

Nowadays, one of the most popular ways to get a more sustainable cement industry is using additions as cement replacement. However, there are many civil engineering applications in which the use of sustainable cements is not extended yet, such as special foundations, and particularly micropiles, even though the standards do not restrict the cement type to use. These elements are frequently expo...