A method for dosing a cement plasticizer chemical admixture into a concrete load contained in a delivery mixer truck using a processor-controlled system and a delivery mixer truck mixer drum, comprising: providing a concrete mix load into the rotatable drum of a delivery truck, the concrete mix load having a known volume; characterized by providing a processor-accessible database having data sets obtained from at least four doses, wherein a data set comprises a slump characteristic before the addition of a chemical admixture, a slump characteristic after the addition of a chemical admixture, the volume of chemical admixture added to achieve the change in slump characteristic, and the volume of concrete to which the chemical admixture was added, or combinations thereof; monitoring the concrete mix load in the truck drum during transit at least every five minutes from at least batching until dosing of the chemical admixture using a processor unit to calculate the time-to-administer admixture dose t a for the concrete mix load based upon i. a scheduled pour time t p; ii. the slump characteristic increase ΔS required to achieve the target slump characteristic at pouring wherein the slump characteristic increase is calculated using the relationship ΔS = S T - S c wherein S T represents target slump characteristic and S c represents current slump characteristic of the concrete mix load during transit; iii. the dosage D ΔS required to achieve the slump characteristic increase ΔS which is based on the current slump characteristic Sc, and the data described above in the providing a processor-accessible database step; wherein the time-to-administer admixture dose t a is calculated by the relationship t a = t p - t h, where t h is based on at least the time required to add the chemical admixture; and administer the admixture dose when the current time t c equals or exceeds the time-to administer t a such that the following relationship is satisfied: D Δ s > D c / t c − t b × t p − t a wherein t c represents the current time, t a represents the time-to-administer admixture dose, D ΔS represents the dosage required to achieve a target slump characteristic from a current slump characteristic, D c represents the total cumulative admixture dosages since time of batching (t b) up to current time (t c), and t p represents the time at which the concrete load is scheduled to be poured. providing a concrete mix load into the rotatable drum of a delivery truck, the concrete mix load having a known volume; characterized by providing a processor-accessible database having data sets obtained from at least four doses, wherein a data set comprises a slump characteristic before the addition of a chemical admixture, a slump characteristic after the addition of a chemical admixture, the volume of chemical admixture added to achieve the change in slump characteristic, and the volume of concrete to which the chemical admixture was added, or combinations thereof; monitoring the concrete mix load in the truck drum during transit at least every five minutes from at least batching until dosing of the chemical admixture using a processor unit to calculate the time-to-administer admixture dose t a for the concrete mix load based upon i. a scheduled pour time t p; ii. the slump characteristic increase ΔS required to achieve the target slump characteristic at pouring wherein the slump characteristic increase is calculated using the relationship ΔS = S T - S c wherein S T represents target slump characteristic and S c represents current slump characteristic of the concrete mix load during transit; iii. the dosage D ΔS required to achieve the slump characteristic increase ΔS which is based on the current slump characteristic Sc, and the data described above in the providing a processor-accessible database step; i. a scheduled pour time t p; ii. the slump characteristic increase ΔS required to achieve the target slump characteristic at pouring wherein the slump characteristic increase is calculated using the relationship ΔS = S T - S c wherein S T represents target slump characteristic and S c represents current slump characteristic of the concrete mix load during transit; iii. the dosage D ΔS required to achieve the slump characteristic increase ΔS which is based on the current slump characteristic Sc, and the data described above in the providing a processor-accessible database step; wherein the time-to-administer admixture dose t a is calculated by the relationship t a = t p - t h, where t h is based on at least the time required to add the chemical admixture; and administer the admixture dose when the current time t c equals or exceeds the time-to administer t a such that the following relationship is satisfied: D Δ s > D c / t c − t b × t p − t a wherein t c represents the current time, t a represents the time-to-administer admixture dose, D ΔS represents the dosage required to achieve a target slump characteristic from a current slump characteristic, D c represents the total cumulative admixture dosages since time of batching (t b) up to current time (t c), and t p represents the time at which the concrete load is scheduled to be poured.