Authors: Jun Zhao, Gao Chuang Cai, Dan Ying Gao
Abstract: The binding properties of chloride ion of sulphoaluminate cement and portland cement were studied in different age,different water-cement ratio and different chloride ion content. The results show that binding rate tends to increase as the age and water-cement ratio increase for above two type cements. But the trend is opposite with the increase of total amount of incorporation chloride ion(TAIC), and the early strength of sulphoaluminate cement decreases slightly.
698
Authors: Li Qun Hu, Ai Min Sha
Abstract: This paper mainly presents the study on the properties of cement treated aggregate with different coarse aggregate content. The test specimens which contain 75%, 70%, 65%, 60% and 55% of coarse aggregates were made and the 7d, 28d, and 90d unconfined compressive strengths (UCS), 28d thremal shrinkage coefficient, as well as 90d anti-erosion performance were tested. Results show that with the increase of coarse aggregate, the maximum dry density (MDD)of the cement treated aggregate mixture increased slowly at first to reached the peak value and then decreased rapidly; The optimum moisture content (OMC) declined with the increase of coarse aggregate content; In order to enhance the UCS of cement treated aggregate, coarse aggregate of mixture can be increased to some extent, but too much coarse aggregate will increase the void of the specimen and lead to lower UCS; Increasing the content of coarse aggregate is able to decrease the thermal shrinkage coefficient and erosion quantity of 30 min of the specimens. This is favourable to enhance the cracking resistance and anti-erosion performance of cement treated aggregate base course.
729
Authors: Chun Mei Mu, Bao Chen Liu, Zhi Kui Liu
Abstract: Lots of “problematical piles” have been discovered during inspection of core-pulling to cement mixing piles, and the layout of the problematical piles are not uniform. Emergence of the problematical piles have conduced invalidation of the cement mixing piles. Combining practical works of the engineering unit, a series of tests and studies have been done, for example, inspection of core-pulling and excavation, static loading test, testing the indexes of physical and mechanical properties with the decrease of the distance between cement mixing piles and septic tank, compressive strength test,etc.The research indicates that all test result have contented design demand and attained prospective effect. These studing have an important significance on the reinforcement design and engineering practice of red clay being polluted by organie matter.
3581
Authors: Dong Li, Fu Dan Chen, Cheng Cheng Che, Ling Peng Kong
Abstract: Based on desulfurization gypsum, blast furnace slag and steel slag (DGBFSSS), a new clink-free cementitious material with the meaning of saving energy and environment protection was invented. This paper further study on DGBFSSS in the application of cement stabilized macadam. The results show that DGBFSSS cement stabilized macadam with higher delay unconfined compressive strength and splitting strength, lower compression rebound modulus and better drying shrinkage performance than ordinary Portland cement stabilized macadam.
2955
Authors: Xiao Long Li, Guo Zhong Li
Abstract: In this experiment, cement, fly ash, quicklime, foaming agent and foam stabilizer were used as raw materials to prepare the new foamed cement insulation material. Single-factor tests were designed to study the influence of different dosages of foaming agent, foam stabilizer and quicklime on the material properties. The optimum ratio was determined: content of fly ash was 25%, water-cement ratio was 0.37, content of foaming agent was 4.5%, content of foam stabilizer was 1.2% and content of quicklime was 1.5%. The material is tested: 3d compressive strength of the material is 1.049MPa, 3d flexural strength of the material is 0.608MPa.
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