Fu Sheng Liu

The Research on the Effect of Granite Powder on Concrete Performance

Abstract: The experimental research on the effect of different incorporation of granite powders on the workability, mechanical property and impermeability performance of concrete is carried out. The result show that the concrete with an appropriate dosage of granite powder exhibits favorable workability, impermeability performance and cohesiveness. And granite powders agree with cement-based materials. Within some dosage of granite powders, the compressive strength of the mixture is approximate to that of common concrete. When the 10% of cement was replaced by the granite powder, good impermeability performance exhibits, with the relative permeability coefficient 30% lower than that of common concrete.

A New Cost Effective Building Material: Compacted Wheat Straw Block

In this paper it is shown that compacted wheat straw block is a cost effective building material in China. Wheat straw is renewable resource and ecological material, when used as building material; it is less energy and material consumption. The compacted wheat straw block has a small thermal diffusivity and good fire resistance. The hydraulic properties will guarantee a comfortable humidity of in door air, and protect the material from rot, and ensure the durability of the construction. The mechanical properties will also increase the structure safety. It is absolutely a cost effective building material.

Experimental Study on Compressive Property of New Concrete Block Masonry with Multi-Row Cores

With the development of energy-saving in buildings, new energy-saving block masonry with multi-row cores is commonly used. In this paper, from the study of typical bearing capacity of multi hole concrete block masonry of combining multiple rows of holes, holes in the multi block wall masonry capacity test of heat insulation material characteristics. Test results show that, in the process of multi hole masonry brittle failure characteristics, built-in straw block in the insulation at the same time, can improve the compressive strength of masonry; masonry local diffusion mechanism under the action of stress is significant; and offer the engineering measures.

Mechanical Strength and Microstructure Analysis of Cementitious Wheat Straw Composite

Wheat straw alkali treatment has impacts on the strength of cement mortar and glazed hollow beads insulation mortar. The results show that the bending strength and bending strength of cement mortar specimen with 4% wheat straw are respectively 58.3% and 40.9% of the benchmark specimen, but bending-press ratio of the latter is 1.42 times of the former. The SEM images reflect the straws influences on the cement hydrate morphology, status and the influence of the number on cement mortar and glazed hollow beads insulation mortar. Compared with the latter, the former C-S-H gel is loose fibrous, failure to form a good network. In the thermal insulation mortar consistency and stratification of the same circumstances, with straw dosage increased, strength first increases, then declining. And folding pressure than in straw dosage is less than 24% more ideal. The SEM pictures show that network C-S-H gel decrease and loose fibrous C-S-H gel increased. At the same time, AFt gradually become attenuate and curly.

Analysis on Seismic Behavior of Gravity Dam Based on ANSYS

Dynamic analysis can be carried out quickly and accurately for the seismic performance of dam by using the finite element software. Added massed method is used for the dynamic water. Horizontal earthquake acceleration is 0.2G; vertical earthquake acceleration is two-third of horizontal earthquake acceleration; sub space iteration method is used for the modal analysis of the dam; Finding the maximum response-order mode shape, and then useing a combination of square and square root method to come to the conclusion of overall seismic response. The stress and strain of the dam had been analyzed and the weak link of key parts of the dam had been summarized in this article.It is concluded that seismic design requirement are satified for the dam.

Experimental Research on Heat Preservation and Moisture Transfer Performance of Stalk Concrete Block

Stalk concrete block was made of compressed wheat stalk brick and hollow concrete block. Experimental study on heat preservation performance of stalk concrete block and stalk concrete block was carried out. Average heat transfer coefficient of experimental wall made by hollow concrete block is 1.57 W/m2.K and stalk concrete block is 1.08W/m2.K. Performance of moisture transfer of compressed wheat stalk brick was acquired by using thermostatic and humidistat chamber. Profile of humidity absorption and release was also acquired. The maximum moisture content of compressed wheat stalk brick is 8.85 %. Relative humidity in certain space can be controlled within 50 % -65%.

Study on the Seismic Performance of Block Masonry

For the time being there are few literatures about study on the seismic performance of concrete hollow block masonry based on the finite element method, left fewer conclusions for reference. According to characteristics of the finite element software, which has strong capability of nonlinear analysis, some key problems are discussed, including the modeling of the concrete hollow block masonry structure, constitutive relations of the materials in block masonry, damage assessment, solution methods, the application of the dead and live loads and the earthquake wave and the seismic performance analysis. The time-history analysis is carried out on three different type walls with openings. Some key factors, such as core columns and ring beams, which have a great influence on the damage pattern and stability of the structure, are discussed. The conclusion from the paper can provide a beneficial reference for in-depth study of the seismic performance of concrete hollow block masonry and the damage patterns.

Researches on the Relationship between Characteristic Parameters of Surrounding Rock and Structural Parameters of Bolting-Grounting Support Body Based on the Ideal Elastic-Plastic Support Model

For the time being the theory about the failure mechanism of the soft rocks, mechanical behavior of bolting-grouting support body in soft rocks has not been fully comprehended. The design of the bolting-grouting support is mostly based on experience and by analogy, and the theoretical analysis results are far more different with the practical engineering. To solve the problem, the researches on the bolting-grouting support mechanism of the soft rocks and the interrelationship between characteristic parameters of the surrounding rocks and structural parameters of bolting-grouting support body are carried out based on the nested models of original surrounding rocks and the bolting-grouting structure. The qualitative and quantitative relationship between characteristic parameters of the surrounding rocks and structural parameters of bolting-grouting support is found out. At the same time, it could also provide beneficial reference to the practical engineering design and construction.

The Influence of Granite Powder on Mechanics Properties of Cement Mortar

large amount of granite powders wastages were produced during the process of the stone processing, therefore the research on recycling and utilizing the wastages was carried out. Based on the size distribution of granite powders specified by the laser particle size analyzer, the research on the influence of granite stone powder on the mechanical properties of cement mortar was carried out through the cement grinding test and scanning electron microscopy (SEM). The test result shows as follows. The flexural and compressive strength of cement mortar with replacement rate of granite stone powders of 20% is the highest when the same particle size of granite stone powder is incorporated. When the replacement rate of granite powders is the same, the smaller the particle size of granite stone powder is, the higher the flexural and compressive strength of cement mortar is. When the replacement rate of granite powders is 20%, with the particle size ranging from 0μm to 45μm, the filling effect of the granite stone powder can be fully utilized to the best.

The Catastrophe Model Research of Rock Instability of Tunnel Blot-Grouting Support Structure

The tunnel excavation destroys rock stress state and when concentrated stress exceeds the strength of surrounding rock, the tunnel periphery rocks will be destroyed. And the effective bearing ring will be soon instable and it needs to be supported. Blot-grouting support is an active support method which organically combines shotcreting support and grouting consolidation and its theoretical research achievements are less. This paper, starting from catastrophe theory, established catastrophe instability model of blot-grouting support body and it also obtained the mechanic judgment criterion of blot-grouting support body damage and the regular pattern of the point (N, q)’s motion tract in the controlling space, of which the influence to the rock stability. And the paper also judged the minimum thickness of blot-grouting support body in the point of catastrophe stability model to provide the basis for theoretical calculation and engineering application.