Fireproof Performance of Foam Concrete Insulation Board

2011 ◽  
Vol 250-253 ◽  
pp. 474-479
Author(s):  
Shui Jun Yu ◽  
Yu Long Wang ◽  
Ben Jie Duan ◽  
Jun Wei Zhou ◽  
Fei Yang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Water Content ◽  
Loss Rate ◽  
Strength Loss ◽  
Building Energy ◽  
Fire Performance ◽  
Foam Concrete ◽  
Calcination Time ◽  
Standard Specimens ◽  
Building Energy Saving

Foam concrete is used in building energy-saving insulation works, to study its fire performance is very important for further enhancing the fire performance of buildings. Under simulated fire conditions, by determining the compressive strength of foam concrete at different densities, different calcination time and different water content, this experiment studies the effect of these conditions on the fire performance of foam concrete. The results show that in case of fire, the compressive strength loss rate of foam concrete increases with the decreasing of density; to calcine the foam concrete standard specimens whose density are 300kg/m3 and 800kg/m3, their strength loss rates are 66.3% and 25.5%, the compressive strength of foam concrete in the same density increases with the calcination time decreasing, water content has different effects on different densities of foam concrete in the fire security. The foam concrete is non-flammable, but its compressive strength decreases due to the fire of combustible materials and high-temperature calcination.

Refractory Performance Study on Foamed Concrete and Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1034-1038
Author(s):  
Shui Jun Yu ◽  
Peng Fei Zhang ◽  
Xiao Fang Yang ◽  
Hong Zhao ◽  
Xiao Li Chen
Keyword(s):  
Compressive Strength ◽  
Loss Rate ◽  
Concrete Block ◽  
Strength Loss ◽  
Performance Study ◽  
Concrete Compressive Strength ◽  
Foam Concrete ◽  
Foamed Concrete ◽  
Heat Preservation ◽  
In Fire

Foam concrete is used in building energy saving and heat preservation project, and its refractory performance is very important to improve the fire resistance ability of the building. In this paper, fireproof property of the foamed concrete were studied.In the simulation fire conditions, compressive strength value of foamed concrete in different density, different calcination time, and different water content cases were determined first, then influence of these conditions on the foamed concrete refractory performance were researched. The results showed that foamed concrete compressive strength loss rate increase with density decreases in fire cases; Density of 300kg/m3 and 800kg/m3 foam concrete block, calcinated under 800°C fire in 20 min, its compressive strength loss rate were 66.3% and 25.5% respectively; The same density of foamed concrete compressive strength gradually reduce with the increase of calcining time; Moisture content on the different density of foam concrete affect differently on the fire safety. Foamed concrete is incombustible, but its compressive strength reduced due to fire inflammable material of high temperature calcined.

Experimental Research on Compressive Strength and Storage Period for Dry-Mixed Material of Shotcrete

2010 ◽  
Vol 168-170 ◽  
pp. 1501-1505
Author(s):  
Jing Shuang Zhang ◽  
Qin Yong Ma ◽  
Xing Teng Han
Keyword(s):  
Compressive Strength ◽  
Water Content ◽  
Experimental Research ◽  
Loss Rate ◽  
Raw Materials ◽  
Engineering Application ◽  
Storage Period ◽  
Strength Loss ◽  
Mix Proportion ◽  
And Storage

According to dry-mixed materials of shotcrete which composed of raw materials in mix proportion the concrete quality as field mixing were included. Through the experimental research on the storage period of using dry-mixed materials in shotcrete, variations of compressive strength were obtained. In according with the studies on the storage period of dry-mixed materials in 7d, 11d, 15d, 20d and 28d, compared with 0d, the loss of compressive strength were obtained under different sand water content (0%, 0.5% and 1.0%). The results shown that strength loss rate of C30 concrete was 6.7% when the sand water content was 0.5% in the 28d and while strength loss rate was 12.0% when the sand water content was 1.0%. The studies on storage period provide supports to the using of dry-mixed shotcrete in engineering application.

Effect of Mica Content in Stone Powder of Manufactured Sand on Performance of Cement Mortar

2014 ◽  
Vol 1044-1045 ◽  
pp. 624-628
Author(s):  
Jie Quan Xing ◽  
Shu Lin Zhan ◽  
Xin Yu Li
Keyword(s):  
Compressive Strength ◽  
Loss Rate ◽  
Cement Mortar ◽  
Mass Loss Rate ◽  
Strength Loss ◽  
Freezing Resistance ◽  
River Sand ◽  
Manufactured Sand ◽  
Freeze Thaw ◽  
Different Content

This paper studies the influence on compressive strength, freezing resistance and microstructure of cement mortar with different content of mica in stone powder, in the tests, manufactured sand with high content of mica and natural river sand were mixed with different proportion, and the content of stone powder was the same in mixed sand. Experiment results indicate that, with the increasing of mica content in stone powder, 28d and 60d compressive strength of cement mortar decreases obvious, mass loss rate and strength loss rate with 50 freeze-thaw cycles increase a little. Microstructure of cement mortar with higher content of mica is not compactly by SEM, the internal defects of cement hardened pastes could be increased because of the flake mica which surface is smooth, and it will cause the spread of micro crack.

Experimental Research on New Concrete Air Entraining Agent

2011 ◽  
Vol 194-196 ◽  
pp. 1063-1068
Author(s):  
Bao Min Wang ◽  
Ni Tu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Dynamic Modulus ◽  
Frost Resistance ◽  
Loss Rate ◽  
Strength Loss ◽  
Weight Loss Rate ◽  
Thaw Cycle ◽  
New Type ◽  
Resistance Durability

Using waste to produce a new type of air entraining agent (AEA), carrying out research of the concrete’s mixture performance, mechanical properties and frost resistance durability after mixing with the AEA, with results showing that amount of air entrained in the concrete mixture and the water reducing rate increases along with the increase of the addition of the new AEA, and its compressive strength loss laws are similar with that of normal AEAs. During the frost-thaw cycle test, when the weight loss rate has reached its limit, concrete with the new AEA added can withstand almost 300 cycles, and at this time the relative dynamic modulus of the concrete, when the amount of air entrained in it is 4.5%, is 83.5%, and the relative dynamic modulus is 85.4% when the amount of air entrained is 5.3%. The addition of the AEA has obviously improved the pore structure of the concrete, and significantly raising its frost resistance durability.

Experimental Research of Foaming Concrete Performance with Different Ash Calcium

2013 ◽  
Vol 683 ◽  
pp. 435-438
Author(s):  
Li Hua Gu ◽  
Yong Feng Wang ◽  
Jian Wei Yue
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Building Materials ◽  
Quantitative Relationship ◽  
Dry Density ◽  
Light Weight ◽  
Comparative Experiment ◽  
Fire Performance ◽  
Foam Concrete ◽  
Building Insulation

Foam concrete as an inorganic building insulation materials, light weight, good thermal insulation and excellent fire performance characteristics, it is the new building materials with low flammability that is good for environmental protection, energy and money saving. This paper establishes the quantitative relationship between the foam concrete’s 3d, 7d and 28d compressive strength and ash calcium dosage through the comparative experiment and analysis. Reveales the law ash calcium on compressive strength, thermal conductivity and dry density of the foam concrete.

scholarly journals Study on Mechanical and Thermal Performance of Building Energy-saving Wall with Insulation Materials

2021 ◽  
Vol 242 ◽  
pp. 02005
Author(s):  
Fuzhen Chen
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Composite Materials ◽  
Energy Saving ◽  
Sodium Alginate ◽  
Natural Fiber ◽  
Wood Fiber ◽  
Building Energy ◽  
Fiber Content ◽  
Building Energy Saving

Sodium alginate and natural fiber were used as modifiers to prepare sodium alginate natural fiber type biological composites. The mechanical properties were characterized by universal testing machine, and the thermal properties were analyzed by conductivity, The effects of wood fiber and straw fiber content on the comprehensive properties of biological composite materials were evaluated by relevant instruments, and the feasibility of biological composite materials as building energy-saving wall insulation materials was evaluated. The results show that the flexural strength, compressive strength and elastic modulus of the composites increase with the increase of wood fiber content. When the wood fiber content is 100%, the mechanical properties of the sample are the best, the flexural strength is 0.573 MPa, and the compressive strength is 1.410 MPa. The results showed that wood fiber and sodium alginate binder were closely combined and had good wettability. The thermal conductivity of biological composite is 0.078-0.089w / (m · K), which means it has good thermal insula tion performance and can be used as thermal insulation material for building energy-saving wall. The results show that the properties of the composite can be improved by adding a higher proportion of wood fiber and a certain amount of glyoxal crosslinking agent.

scholarly journals Frost Resistance Test Research on Hybrid Fiber Concrete Based on Range Analysis

2015 ◽  
Vol 9 (1) ◽  
pp. 292-297 ◽  
Author(s):  
Liu Faming ◽  
Zhao Lisha ◽  
Ma Jie
Keyword(s):  
Compressive Strength ◽  
Frost Resistance ◽  
Loss Rate ◽  
Steel Fiber ◽  
Polypropylene Fiber ◽  
Strength Loss ◽  
Hybrid Fiber ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Fiber Concrete

The research of single doped fiber concrete is relatively mature. But the research about different varieties and different geometry shape of hybrid fiber concrete was very poor. Across the research in theory, hybrid fiber concrete can improve the balance of fiber three-dimensional distribution and coordinating role of aggregate and fiber, improve the efficiency of toughening crack resistance. In this paper, through the orthogonal experiment design method for hybrid fiber reinforced concrete, the mass and compressive strength loss rate after 50 times, 75 times, 100 times freeze-thaw cycle had been studied. Use range analysis quantified the influence level of various factors on the mechanical properties. It was analyzed the hybrid fiber influence on improving the efficiency of toughening crack resistance and frost resistance. It is concluded that adding the fiber can enhance the performance of concrete frost resistance. Long steel fiber have great influence on compressive strength loss rate of hybrid fiber concrete, such as the compressive strength loss rate was reached 65.47% after 75 times freeze-thaw cycle. Short steel fiber have certain influence on mass loss of concrete which were after less freeze-thaw cycles. The influence of polypropylene fiber on concrete frost resistance increases significantly, the effect can reach 36.78% after 50 times of freeze-thaw cycle. The optimal combination of the hybrid fiber concrete ultimately determined was A2B2C3 (simultaneously mixed with 50kg/m3 short steel fiber and long steel fiber as well as 0.9kg/m polypropylene fiber). The addition of steel fiber and polypropylene fiber are both beneficial to increase the internal air content of concrete, strengthening the frost resistance of concrete. However, with the increase of dosage, the internal porosity of concrete is gradually increasing, the density is reduced, and, as a result, the corresponding increase of the compressive strength loss rate is also improved.

scholarly journals Experimental Study on Mechanical Properties of High-Ductility Concrete against Combined Sulfate Attack and Dry–Wet Cycles

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4035
Author(s):  
Lingling Li ◽  
Junping Shi ◽  
Jialiang Kou
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Loss Rate ◽  
Rapid Development ◽  
Engineering Application ◽  
Sulfate Solution ◽  
Strength Loss ◽  
Sulfate Attack ◽  
High Ductility ◽  
Chemical Attack

Concrete will deteriorate and damage under sulfate attack. In order to study the degradation characteristics of HDC under sulfate attack, the mechanical properties of high-ductility concrete (HDC) were investigated using the uniaxial compressive strength test of HDC specimens soaked in different concentrations of sulfate solution and subjected to different times of dry–wet cycles. The variations in the compressive strength, loss rate of compressive strength, and the max compressive strength under the action of sulfate attack and dry–wet cycles were analyzed. The analytical expressions of damage variables were given. SEM was used to observe the microstructure of the sample, and the microdamage mechanism of the HDC was explored. The deterioration of the HDC was found to be the result of the combined action of sulfate attack and dry–wet cycles and was caused by physical attack and chemical attack. PVA prevented the rapid development of deterioration. On the basis of the change of compressive strength, the damage variable was established to quantitatively describe the degree of damage to HDC. The experimental results showed that with the increase in the number of dry–wet cycles, the compressive strength of HDC generally increased first and then decreased. As the concentration of the sulfate solution increased, the loss rate of the compressive strength of HDC generally increased and the max compressive strength gradually decreased. With the increase in the number of dry–wet cycles, HDC first showed self-compacting characteristics and then gradually became destroyed. Compared with ordinary concrete (OC), HDC is superior to OC in sulfate resistance and dry–wet cycles. This study provided a test basis for the engineering application of HDC in sulfate attack and dry–wet cycles environment.

The Effects of Admixtures on the Adobe Wall Materials' Durability

2012 ◽  
Vol 174-177 ◽  
pp. 1306-1311
Author(s):  
Jun Liu ◽  
Jin Hu Shi ◽  
Fang Zhi Lin ◽  
Wen Hui Sun
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Absorption Rate ◽  
Loss Rate ◽  
Water Resistance ◽  
Strength Loss ◽  
Cement Stone ◽  
Water Absorption Rate ◽  
Wall Materials

Objective:this paper would research the effects of different dosages of admixtures doped to the adobe wall materials' compressive strength, 30min soaking compressive strength loss rate, water resistance, water absorption rate and resistance drying and watering cycle can be modified by cement, stone powder and fly ash three admixtures which are single-doped into the samples. Result: The single-doped cement can enhance the durability of the adobe wall materials obviously. When the dosage of stone powder's single-doped is 0~5%, it can lower the 30min soaking compressive strength loss rate and water absorption rate. When the dosage of it's single-doped is 5~15%,it raises the 30min soaking compressive strength loss rate and water absorption rate. While the dosage of single-doped fly ash is increasing, it could lower the adobe wall materials' compressive strength, but other performance lowers after that first enhances,and the single-doped dosage of 5% is the turning point performance.Conclusion: Three kind of admixtures can modify the adobe wall materials' durability. When the dosage of stone powder and fly ash's single-doped are 5%,the sample's performance of water resistance is best.It meets the demands of the adobe wall materials' durability.

Experimental Research on a New-Type Concrete Antifreeze

2011 ◽  
Vol 148-149 ◽  
pp. 1209-1213
Author(s):  
Bao Min Wang ◽  
Kai Song ◽  
Ni Tu
Keyword(s):  
Compressive Strength ◽  
Loss Rate ◽  
Performance Test ◽  
Setting Time ◽  
Strength Loss ◽  
Freeze Thaw ◽  
Performance Indexes ◽  
Thaw Cycle ◽  
Basic Performance ◽  
Freeze Thaw Cycle

Basic performance test was performed on a newly-developed compound antifreeze and experiment was carried out to study the basic performance, mechanical property and durability of the concrete mixtures containing 0%, 4% and 5% antifreeze. The result shows the antifreeze may be used for the concrete construction at 20°C below zero and it has favorable performance for winter construction. When the amount to be added is 4% and 5%, the ratio of compressive strength of 28 days shall be 105% and 107% respectively; the ratio of compressive strength of 56 days shall be 114% and 112% respectively. In freeze-thaw cycle experiment, 50 times of freeze-thaw strength loss rate is 45.3% and 44.8% of the strength loss rate of the concrete without the antifreeze. The water-reducing ratio of the antifreeze, ratio of bleeding rate, air content, difference in setting time, strength ratio, ratio of shrinkage, permeated height ratio and other performance indexes all satisfy specification requirements.

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