Applied Mechanics and Materials Vols. 638-640

Abstract: Adding glazed hollow beads in ordinary foam concrete, the thermal insulation, dimensional stability, waterproofness and cracking resistance would be improved. Through testing the basic mechanical properties of foam concrete mixed with different mix amount of glazed hollow beads and then comparing and theoretical analyzing results obtained, it is concluded that when the content of glazed hollow beads is 30%, the mechanical properties of foam concrete is better than other schemes.

Abstract: Thermal insulation glazed hollow bead concrete is a new building material, which is bearing general physical and mechanical properties of concrete. Experimental study of concrete after high-temperature, it is different from the ordinary concrete, because there is component of glazed hollow bead. In this paper, based on the observations and analysis of thermal insulation glazed hollow bead concrete after high temperature under electron microscope and comparison with ordinary concrete, the failure mechanism of thermal insulation glazed hollow bead concrete after high temperature are obtained.

Abstract: Glutinous rice porridge is widely used to mortar formulations in ancient China, and it is significant to understand the interaction between amylopectin and cement pastes. X-ray diffraction analysis, field emission scanning electron microscope (FESEM) analysis and atomic force microscopy (AFM) analysis are used to investigate hydration products in the cement pastes modified by amylopectin in this article. The results show that the hydration products in modified cement pastes were same with those in the unmodified cement paste. However, the growth of hydration products, such as calcium hydroxide (CH), calcium silicate hydrate (C-S-H) and entringite (AFt), are strongly influenced by amylopectin in glutinous rice. And the heavily branched structure of amylopectin is the crucial parameter for the specific control of the size and morphology of hydration products.

Abstract: According to the design of underground garage roof structure for a practical project, this paper introduces basic structure and designing method of the honeycombed core hollow floor , compared with the multi-ribbed floor design . Then it calculates economic and technical indexes of two kinds of floor scheme. The results shows that the garage roof with honeycombed core hollow floor has better technical and economic advantages .What’s more, it behaves with large space as well as span more especially.

Abstract: Self-compacting concrete is absent of vibration noise during casting, improves the construction efficiency, and provides a healthier working environment compared to the traditional vibrated concrete. The potential coarse recycled aggregate obtained from crushed concrete for making self-compacting concrete was considered to replace the aggregate with the percentage of substitution of recycled coarse aggregate 0%, 50% and 100%. Thus, three types of concrete mixtures were made. Experiments show that, the properties of these concrete only have slight differences and recycled coarse aggregate can be successfully used for the preparation of self-compacting concrete. The method solves the problem of the waste disposal by the demolition of old buildings.

Abstract: Lauryl alcohol mixed paraffin to prepare PCM mortars. Study on the heat storage using DSC equipment; study on the temperature level and temperature time by boilingwater; the DRM-II type "heat storage coefficient measuring instrument is used to check heat storage coefficient,and analysis the thermal inertia through heat storage coefficient and thermal conductivity.

Abstract: Emergence of commodity concrete and pumping concrete is a major development of modern concrete technology, it has high efficiency, high homogeneity and good environmental effects, etc. But, use of modern high performance concrete make the difficulty of controlling the early cracks increased, considering this problem, use of polypropylene fibers to test concrete shrinkage cracks, come to regularity of polypropylene fiber affect concrete shrinkage cracks early, in order to serve the synthetic fibers used in concrete better.

Abstract: By using mechanical energy aided aluminizing process, an aluminized layer of 20~180μm was obtained on titanium plate at a low temperature of 650~700°C for 3 hours. The aluminized layer consists of an outer layer of single-phase aluminium, an inner layer of (Al,Si)₃Ti intermetallic compound and aluminium bipolar layer, the silicon element is riched in the Al₃Ti intermetallic compound.

Abstract: In order to research ultra high toughness cementitious composites (UHTCC) economic rationality, this paper chooses the ultra high toughness cementitious composites thermal insulation wall as the research object, uses the study of life cycle method. Establish full life-cycle model with basic life-cycle economic evaluation principle. Evaluate its economic rationality. The results show that ultra high toughness cementitious composites facade has a longer life cycle than ordinary concrete wall. And their local repair costs are all the same, but their maintain frequencies are different. UHTCC facades facing layer does not require maintenance. The calculated models of the two walls are different.

Abstract: The bonded joints between carbon fiber reinforced polymer (CFRP) and high strength concrete subjected to different freeze-thaw cycles were studied and the results were analyzed. The test results indicate that with the increase of freeze-thaw cycles, effective bond length, ultimate bond load and ultimate global slip response will decrease. But it has little effects on initial stripping load. The failure modes change from adhesive debonding to shear failure of concrete.