Authors: Hua Jian Li, Heng Hu Sun, Xue Jun Xiao, Xu Chu Tie
Abstract: The self-adaptive vegetation concrete is a porous concrete which has characteristics of
self-adaptation (suitable for acid-alkali degree and humidity that plant grow automatically),
self-supply (the necessary nutrition element offers plants to grow within the structure) and
necessary mechanics of the project. To meet the vegetable growth in self-adaptive vegetable
concrete, the base body of vegebable concrete is produced with many kinds of cementitious
material and complex of different aggregate. The experiment shows that the vegetable concrete base
body which has a suitable acid-alkali degree environment of seed sprout (PH < 9) and suitable
space environment for plant root system growth( porosity rate > 40%) is produced through using
self-made soil stabilizer (the proportion of soil stabilizer and the clay is 1:1) and different
aggregates (cobble, coral reef and ceramsite).
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Authors: Regina Kalpokaite-Dickuviene, Kristina Brinkiene, Jurate Cesniene
Abstract: The effect of microfiber produced from recycled waste catalyst on microstructure and mechanical strength of cementitious complex binder was analysed. Complex binder reinforced with 1%, 3% and 5% fibers were exposed to 600, 800 and 1000°C for 3h. The influence of annealing temperature on morphology of fiber reinforced complex binder was analyzed applying SEM, XRD techniques. Experimental results showed that reinforcement with 1% of fiber had advantage on mechanical strength of complex binder up to 800°C. Meanwhile addition of 5% of fiber resulted in lowest values of strength and reduced bulk density of complex binder in all firing temperature range.
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Authors: Yu Qiang Lin, Yan Shi, Jia Zheng Li, Hua Quan Yang
Abstract: Paper studies on phosphorus slag powder(PSP) processed from phosphorus slag with different open-air storage time, analyses the changes in the performance of PSP and the impact on properties of cementitious materials. The results showed that with the growth of open storage time, vitreous structure of PSP would gradually be decomposed, part of the vitreous would transform into crystal form. Density of powder would diminish and ignition loss increase. Activity of PSP would slowly decreases, and the activity differences main reflected after 90d. Concerning on the point of concrete strength rating, 10 years phosphorus slag can still be used. The above provide a basis for resource utilization of phosphorus slag with long storage time.
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Authors: Ying Li Gao, Ling Cheng
Abstract: Cement based composite cementitious material containing steel slag used in road has been prepared to deal with the current situation that the transportation carbon emission increased year by year. In this material, 40% cement has been replaced by equivalent steel slag, which has the ability of CO2 sequestration. This paper studied the CO2 sequestration effect and the mechanical properties of the pure cement, the pure steel slag, and the cement based composite cementitious materials containing steel slag. It has been shown that the cement based composite cementitious materials containing steel slag have excellent CO2 sequestration property. The mass fraction growth rate of carbon reached 10.86% after 1 hour carbonation experiment, the value between which of pure cement and pure steel slag, and the compressive strength of the composite cementitious materials at 28-day age can reach 45.3MPa, meeting the requirements of road.
1949
Authors: Peng Ping Li, Jian Bo Xiong, Zhi Hong Fan
Abstract: The influence of stone dust content on chloride diffusion coefficient in C30, C40 and C50 grade concretes were investigated by means of the natural immersion test, XRD test, MIP test, SEM and TGA test, respectively. The experimental results showed that the chloride diffusion coefficient in C30 grade concretes decreased with increasing the stone dust content, but it decreased first and then increased with increasing the stone dust content in C40 and C50 grade concretes. The hydration degree for cementitious and compressive strength for concrete was slightly promoted by using stone dust replacing cementitious at a low level. For C30 grade concretes, the porosity decreased with increasing the stone dust content in fine aggregate, but for C40 and C50 grade concretes, the total porosity decreased first then increased with increasing the stone dust content. And the concrete pore structure was the main factor that influences the changes of chloride diffusion coefficient in concrete.
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