The Research On The Factor Of The Effect On The Common Concrete Capability

The concrete function has been the contents which is concern most in the concrete engineering. Regardless is the work which freshly mixes concrete, mechanics functions after harden and the enduring function of keeping its strength over a long period of time are still allimportant much aspects. Domestic and international is born from the concrete to the research of concretes functions of that day of since start. However very complicated and very difficult because of the factor of influence concrete function fixed amount of carry on a description, so also didn't use impossibly at present an united the standard make it normalized. This put forward a higher request to the concrete design, worker, namely according to actual the circumstance makes to prepare to judge to the concrete function and carry on science design since can satisfy a request of construction and promise its function and life span.Influence the factor of concrete function very complicated, the academics involve is very wide, include physics, chemistry, material mechanics, is go to flow to change to learn an etc..Although this text is from the influence concrete function the most basic factor-mixture the material and divides three parts in detail, discussed the function of each hybrid material in working performance of the freshly mix concrete, harden concrete mechanics function, enduring function.Firstly, discusses in detail the trial process of the making freshly mixes concrete and concrete try piece. To original material after carry on the test of selection and physical mechanics index sign has been turned match ratio to design excellently, choused in same batch different water cement ratio, sand rate, and add a different additive, contrast the work function of freshly mixes concrete that have been made. Will the try pieces of make a good resisting compression again, the antiflex, the impermeability, the anti- vitriol's erosion by a strict process of the standard maintenance go various on trial tests.The second part carries on detailed analysis to the influence factors of freshly mixed concrete work's function. It carries on to elaborate the influence factors of freshly mixed concrete work's function from the angle rheology .Including the gather on the influence to the work function among them, the influence of the cement upon the work function, additive to work function of influence, the water content of mixture to work function of influence, time and temperature to work function of influence.The third part carries on detailed analysis to the influence factors of hardened concrete work's function. Harden the concrete function includes mechanics function and enduring function two parts. The factor which influences mechanics function include: the function of raw material, the design of the match ratio, making craft and protect a condition, time the selection of the parameter etc. But the factor of the influence wear emphasized to discuss the main factor of the influence concrete frost resistance and influence the concrete anti- vitriol.After carrying on to a great deal of data hard analysis, this text tries to look for and explain the influence law and proportion and influence mechanism of various factor in the influence the concrete function of each hybrid material, match compare and additive at experiment regulation. Main conclusion of get is as follows:1,The work function aspect of freshly concrete: The water cement ratio is the most important factor to the influence of freshly concrete work function; Gather cement ratio will become the key factor of influence to lately mix a concrete work function while giving water cement ratio. Can see from the formula(3-6) given the C/W, work function with gather cement ratio Va/Vc is a relationship of inverse ratio; When water cement ratio with gather cement ratios all already given, the sand rate is a main influence factor to concrete workability. It must obey a principle of optimally sand rate for obtaining better work function; the more close spheroid of aggregate grain, the higher is the work function of the mixture that is component of gather material Adding to water reducing agent can directly get the liquidity.2,The mechanics function aspect of hardened concrete:The water cement ratio still is the main factor which influences mechanics function. When 0.4< Ws/Cs<0.8, the concrete strength and the water cement is a linear relationship of inverse ratio. .When W/C<0.3, the concrete strength comparing with water cement of lower is lower; the intensity of cement and concrete have the most direct and the most consanguineous relationship. When the w/c given, the intensity of cement is the only variable quantity which influences the intensity of concrete. Different maintenance process to the development of intensity of concrete is more great, according to actual the request of engineering to strength will adopt to different protect measure , such as the nature, standard maintenance and the accelerated maintenance; the water reducing agent itself is no 3,The enduring function aspect of hardened concrete:In the test, adds 6% silica fume can obviously improve the concrete internal bore structure, and"two water turn"reaction happens, can raise frost resistance and the erode function to the anti- vitriol of concrete; Strictly controlling water cement can raise the enduring function of common concrete; Adding to leading air agent is the valid method which raises the concrete frost resistance. If adding to leading air agent, water cement ratio is 0.5, the concrete can also endure 200 times circulation of the frost and melt; the penetrability and gelatinization material is the most important factor in the concrete erosion function of the anti- vitriol. Experiment express that adding silica fume is a better method which improves the erosion function of the anti- vitriol to the concrete.By the analysis of various factor which influences concrete function and the management of trial data, this text scientifically elaborates the degrees(effect) of various factors and its influence mechanism in the different function of concrete, at last get general regulation of influence factor of the common concrete function.