The Experimental Study On The Influence With Filling Content Of Fly Ash Mortar Stone

In recent years, some experts have proposed concrete rockfill dam construction technology and Filling mortar stone dam technology, it is an innovative technology for Masonry Dam. To sum up is the use of mortar mix of its own gravity, fluidity, impact force to pre-mixing well, the ratio of required liquidity poured into the pre-mixed mortar smoothing the hair good stone, so that the free flow of mortar rubble the gap between the go to quickly complete a pile of stones in the body. Such a simple and effective method of construction work there are two key aspects:1) In order to ensure mixing mortar and stone has a good overall performance, must be avoided as far as possible to leave voids or bubbles, mortar, and ensure segregation in the aggregate do not mix mortar Filling process, the mortar can flow freely in the aggregate the gap between the reach filling compacting effect.2) In order to meet the requirements of size and strength of the mechanical properties of mortar mix and aggregate stone between the stone must be fully guaranteed and mixed pulp interface with good adhesion.Based on the rockfill mixing mortar and performance characteristics of each material and play to their strengths, proposed Filling mortar solid construction techniques. Change the use patterns of raw materials, will certainly have a new understanding of its performance in all aspects, so this hedge fill mortar construction technology specific test stones mainly the following aspects.First we conducted Filling mortar mixing mortar construction technology of stone material ratio test:In total cementitious materials meet the same premise, by changing the fly ash substitution rate (0%,20%, 30%,40% and 60%) and cases of water-cement ratio, devised 15 group test in which there are three groups of not blending fly ash controlled trial. Through the mortar on an experimental basis a preliminary summary of the influence of fly ash substitution rate and water-cement ratio of mortar mixed performance from mixing mortar compressive strength, water retention, and mobility in three areas into account, to elect five groups in line with punch fill mixing mortar stone mortar construction technical performance requirements of the mix, which is not a group of fly ash blending comparative test.Next use more than five groups mortar mix ratio, analog filling mortar site into concretion process. In the laboratory, the use of stone loaded glass box instead of outdoor Filling Filling test environment. Preliminary tests proved rockfill mixed mortar is required to meet Filling stones. May be further determined by testing the strength to meet the requirements, the mortar flow is good, the best economy mortar mix.Final selection of a set of ratios were strong compressive strength test different aggregate size of the Group 8 mixed mortar filling size of the stone is fitted with different size 200mm × 200mm × 200mm tryout in conservation 28d formed filling mortar concretion using WAW-2000D-type presses do concretion of compressive strength test were used to detect calculus test body the compressive strength of the block. Through this study it can be concluded:1) When the water-cement ratio into three gradient test used, fly ash substitution rate of 20%,30%,40%, 60% mixed mortar consistency requirements are met Filling. And when the fly ash content of 40%,60% of the test block strength classes less than 10MP,10MP does not meet the design strength of the above requirements, are not considered temporary.2) From the aspect of fluidity of mortar, compressive strength, water retention, economic factors, environmental considerations substituents selected fly ash was 30% for the best. Optimal Filling in a mortar in stone, strong body strength formation is about 1.3 times the strength of mortar test block.3) Under the same conditions as fly ash substitution rate, mixing mortar consistency with the increase of water-cement ratio becomes large, mixed mortar compressive strength with increasing water-cement ratio is decreasing, the degree of stratification gradually smaller; the water-cement ratio under the same conditions, with the increase of the rate of substitution of fly ash, mortar mix in increasing consistency, cube compressive strength decreases.4) solid body of rock block size is also slightly affect their intensity, the greater the intensity of the particle size is also larger.