Commodity Cement Mortar Design Method

Our country began to study and introduce ready-mixed mortar technology from the1980s, and at theend of the90s, ready-mixed mortar production enterprises of a certain scale have begun to spring up. In the21st century, with the promotion of some related policies, the introduction of advanced ideas andtechnologies of foreign countries, and the great efforts of bulk cement workers, ready-mixed mortarproduction enterprises and the users, the ready-mixed mortar production started to present a flourishingsituation. However, the knowledge people have about the commercialization of mortar is far less better thanthat of the commercialization of common concrete. Due to the general lack of the quality of commercialmortar, people think the commercial mortar is of high price and there is no need to put it into use.Compared with the traditional mortar, the biggest advantage of commercial mortar lies in its large-scaleproduction. The mortar is of stable quality and high performance-price ratio and has a broad developingprospect. The technology guarantee of the quality of the commercial mortar is the mix proportion designmethod that can guide the use ratio of commercial mortar.This paper sets the mix proportion design method as research direction. Within the industry standards,it makes a deep research on the influence that different components of normal mortar, fly ash mixed mortarand self-leveling mortar paste leave on the performance of paste. Based on the results of the experiments, itproposes an ordinary cement mortar design method, a fly ash mixed mortar mix design method, and aself-leveling mortar mix design method. Meanwhile, it puts forward an optimized mix proportion designmethod of fly ash by integrating the optimized mix proportion design methods of fly ash designed by manyscholars and consulting my own design method. The paper also simplifies the calculation process of theratio of self-leveling. Specific researches as follows:First, the mix proportion design method of normal mortar. This method regards water consumption asan index to measure consistency. It test the influence that the size of sand, cement sand ratios and claycontent leave on consistency, and adjusts the volume of water accordingly. It sets the ratio of gray water asthe design index of intensity and makes regression analysis of the intensity results under differentexperimental ratios. It adopts the regression equation as strength calculation formula, calculates the cementwater ratio according to the required strength, and the cement contents according to the water consumption, and adopts absolute volume method for calculation of the amount of sand.Second, fly ash mixed mortar mix design method. It sets both the replacement rate of fly ash andcement/water ratio as Strength design index, makes regression analysis of the experimental results,adoptsthe formula as strength calculation formula. This method does not consider the water-reducing effect of flyash, and the water consumption is decided according to the standard of normal mortar. It calculates cementwater ratio according to the required strength and the replacement rate of fly ash, the amount of gelledmaterials according to water consumption, the amount of cement and fly ash according to replacement rate.Third, self-leveling mortar mix design method. It treats mixtures cellulose ether which is used to solvethe contradiction between flow degree and segregation of self-leveling mortar, and water-reducing agent asthe main influence factor of the performance of paste. It makes regression analysis of the experimentalresults and sets the regression equations as strength calculation equation, and treats the admixture schemewhich is used to solve the early strength and delayed coagulation, expansion and contraction ofself-leveling mortar as a secondary influencing factor. And the effect of the factor is used to revise strengthcalculation equation in the form of reduction coefficient. Thus we can get the strength calculation methodof self-leveling cement mortar. Dry shrinkage ratio calculation is to adopt various contradictions solutionsthat are in the form of reduction coefficient to reduce the common dry shrinkage ratio. The final outcome isthe result of the dry shrinkage rate.Fourth, optimization figure.of fly ash mixed mortar ratio. The calculation information of the ratio andperformance requirements are comprehensively presented on the chart. We can visually choose the bestmix proportion scheme that meets the strength requirement according to one or more performancerequirements.Fifth, simplified calculation of self-leveling mortar ratio. Self-leveling mortar has a lot of components,which makes the calculation complex. This calculation method first works out all the data and make up adata table according to a specific rule. Then it chooses the data table that matches the different amountadmixtures and contradiction solution of self-leveling mortar. This simplifies the calculation process in alarge degree..This research makes self-leveling ratio design of mortar possible, and simplifies the calculatingprocess. This makes the normal mortar ratio more accurate, strengthens the control of the production of mortar; and provides a mix design method of fly ash mixed mortar and optimizes the method.