water-cement ratio การใช้

• Effects of water - cement ratio on plastic shrinkage cracking of concrete
• The paper analyzes its performance with the range of the content of gas former , expanding pearlite and water - cement ratio
• High water - cement ratio during construction and low water - cement ratio during solidification are realized by using electroosmosis technology to change the process of concrete construction
• Abstract : water - cement ratio is an important parameter in concrete proportioning design and has a great effect on the nature of concrete , such as its intensity and durability
• The paper has studied the influence of water - cement ratio on the early - age shrinkge and whole shrinkge through self - deviced experimental apparatus for measuring early - age shrinkage
• This butch of beams use 525 # common portland cement , the water - cement ratio is 0 . 53 , the design strength is c35 . lt is cut apart to 150x 150x 150mm3 cube with cutter
• Water absorption rate of high strength ceramsite in concrete is lower than in water , and it is influenced by water - cement ratio , the higher w / c ratio , the bigger water absorption rate . and the lower w / c ratio in concrete is , the less obvious changes of water absorption rate by outer pressure and time are
• In order to establish the non - destructive detecting standard , transverse wave speed is chose as the non - destructive detecting parameter , which strongly correlated with the compressive strength basing on lots of room experiments , and finds the relation between transverse wave speed of cement - soil and its contributory factors . the forecast model of the non - destructive detecting parameter is established by neutral - network toolbox of the matlab . by this model , transverse wave speed and compressive strength are got by putting the soil style , cement - soil ratio , water - cement ratio , maintain condition and the time
• ( 2 ) interfacial agents this experiment adopts three types of interfacial agents : no interfacial agent , neat cement paste which has the same water - cement ratio with the new concrete , cement paste mixed with 10 % expanding agent which has the same ratio with the new concrete ( which is called cement paste mixed with expanding agent for short ) . the thickness of the interfacial agent is 2 ~ 3mm
• This paper deals with high fluid concrete in which high strength ceramsite made from shale was used as coarse aggregate . effects of cement content , water - cement ratio , sand percentage , mineral admixture , grading and pretreatment of lightweight aggregate on compressive strength and workability of high fluid structural lightweight aggregate concrete have been studied . the rules of water absorption of high strength lightweight aggregate under different pressure and effects on uniformity of high fluid structural lightweight aggregate concrete have been studied too
• Based on the calculation methods of nominal water - cement ratio of mortar and average paste thickness of standard sand provided by authors , the nonlinear relation between fluidity of mortar and nominal water - cement ratio of mortar , average paste thickness of standard sand , fly ash - binder ratio was established by using artificial neural network ( ann )
• The grouting liquid with this stability agent has many advantages such as the good volume stability , low dialysis ratio , high strength of cement rock less dry - shrink and convenient construction etc . when the water - cement ratio is 0 . 6 or 0 . 8 , the 28d strength of cement - rock is 210 % and 179 % of the bentonite cement - rock under standard maintain
• The experiments indicate that polypropylene fiber can efficiently enhance the concrete strength of compression , tension and bending . the concrete strength with addition of fiber made in brazil is higher than that mingled with native fiber under the same water - cement ratio . the strength of concrete with addition of polypropylene fiber is lower than that without fiber under the same slamp value
• The distance of the single - row curtain grout hole is between 1 . 4 to 1 . 8 meter , and 2 . 0 meter is suitable for the double - row curtain ; the grouting pressure generally is 1 . 0 to 1 . 5 mpa at the first three grout compartment , then grouting pressure of under the fourth control in 4 to 5 mpa ; for mast grout compartments , a water - cement ratio of 2 or 1 may used in the first grouting
• The relationship of polypropylene fiber addition and mechanical performance of concrete was gained by investigating on the relation between fiber addition of polypropylene and concrete strength of compression , tension and bending , then appropriate addition of polypropylene fiber was obtained . the influence of the polypropylene fibers on concrete strength was analysed by comparing the relationship of fiber addition and mechanical performance under the same water - cement ratio and under the same slamp value
• Proper amount of micro - silica , ultra - fined slag , high quality fly ash , meta - kaolin clay can improve the working ability , hydration heat and strength ( especially in the later period ) of the cement concrete . proper amount of meta - kaolin clay can do good to the strength of the cement concrete but verse to the working ability by magnifying water - cement ratio